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To: mohamed.boucadair@orange.com, Jon Shallow <supjps-ietf@jpshallow.com>, "dots@ietf.org" <dots@ietf.org>
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From: kaname nishizuka <kaname@nttv6.jp>
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Subject: Re: [Dots] draft-ietf-dots-filter-control: acl updates
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Yes.

But if a new draft give us a solid interface of retrieving acl status (an=
d its stats), it doesn't motivate me to implement observe stuff here.

regards,
Kaname

On 2019/05/24 21:52, mohamed.boucadair@orange.com wrote:
>
> Hi Kaname,
>
> The same notification can be sent many times to be sure the notificatio=
n is successfully delivered.
>
> In both modes:
>
> =C2=B7the server needs to track changes on acls bound to a DOTS client.=
 How the tracking is done is implementation-specific.
>
> =C2=B7the client needs to be prepared to receive acl attributes in the =
response.
>
> No?
>
> Cheers,
>
> Med
>
> *De=C2=A0:*Dots [mailto:dots-bounces@ietf.org] *De la part de* kaname n=
ishizuka
> *Envoy=C3=A9=C2=A0:* vendredi 24 mai 2019 11:03
> *=C3=80=C2=A0:*BOUCADAIR Mohamed TGI/OLN; Jon Shallow; dots@ietf.org
> *Objet=C2=A0:* Re: [Dots] draft-ietf-dots-filter-control: acl updates
>
>
> Right, acl stats is not related to the excerpt spec.
>
> But I'm not fully convinced that the observe of the 'activation-type' w=
ill be used.
> Notification of the current state of 'activation-type' can be lost in a=
ttack time even though it's very important if an external action on DOTS =
server is unintended by the DOTS client.
> So I prefer to use a polling request in 4.4.2.2.
> It's an implementation specific, but I've just been wondering if there =
is an alternate to drop the specification of 'activation-type' observatio=
n.
>
> regards,
> Kaname
>
> On 2019/05/17 20:16, mohamed.boucadair@orange.com <mailto:mohamed.bouca=
dair@orange.com> wrote:
>
>     Re-,
>
>     That excerpt from the filter-control draft is not related to acl st=
ats.
>
>     Can you please clarify what would be the implications on the filter=
-control draft if acl-stats are allowed to be returned in GET responses?
>
>     Thank you.
>
>     Cheers,
>
>     Med
>
>     *De=C2=A0:*Dots [mailto:dots-bounces@ietf.org] *De la part de* kana=
me nishizuka
>     *Envoy=C3=A9=C2=A0:* vendredi 17 mai 2019 12:00
>     *=C3=80=C2=A0:* Jon Shallow; BOUCADAIR Mohamed TGI/OLN; dots@ietf.o=
rg <mailto:dots@ietf.org>
>     *Objet=C2=A0:* Re: [Dots] draft-ietf-dots-filter-control: acl updat=
es
>
>     Hi,
>
>     As the conclusion of the discussion about ACL Stats issue, there wi=
ll be a draft about retrieving ACL Stats over the signal-channel WITHOUT =
respect to whether ACLs are activated via signal-filter-control.
>
>     I'd like to note that when it came out, the GET response spec in si=
gnal-filter-control would be subject to change.
>     Basically, this current specification introduces implementation com=
plexity.
>     >=C2=A0=C2=A0=C2=A0 If, during an active mitigation, the 'activatio=
n-type' is changed at
>     >=C2=A0=C2=A0=C2=A0 the DOTS server (e.g., as a result of an extern=
al action) for an ACL
>     >=C2=A0=C2=A0=C2=A0 bound to a DOTS client, the DOTS server notifie=
s that DOTS client
>     >=C2=A0=C2=A0=C2=A0 with the change by including the corresponding =
ACL parameters in an
>     >=C2=A0=C2=A0=C2=A0 asynchronous notification (the DOTS client is o=
bserving the active
>     >=C2=A0=C2=A0=C2=A0 mitigation) or in a response to a polling reque=
st (Section 4.4.2.2 of
>     >=C2=A0=C2=A0=C2=A0 [I-D.ietf-dots-signal-channel]).
>
>     regards,
>     Kaname
>
>
>     On 2019/05/15 22:52, Jon Shallow wrote:
>
>         Hi Med,
>
>         I think that covers it.=C2=A0 Now I have access to my emails, i=
t was the PUT that I was thinking about, not the GET.
>
>         Regards
>
>         Jon
>
>         *From:*Dots [mailto: dots-bounces@ietf.org <mailto:dots-bounces=
@ietf.org>] *On Behalf Of *mohamed.boucadair@orange.com <mailto:mohamed.b=
oucadair@orange.com>
>         *Sent:* 15 May 2019 12:22
>         *To:* Jon Shallow; dots@ietf.org <mailto:dots@ietf.org>
>         *Subject:* Re: [Dots] draft-ietf-dots-filter-control: acl updat=
es
>
>         Re-,
>
>         Noted. Thanks.
>
>         With regards to your second point, we do have the following in =
the draft:
>
>         =C2=A0=C2=A0 If, during an active mitigation, the 'activation-t=
ype' is changed at
>
>         =C2=A0=C2=A0 the DOTS server (e.g., as a result of an external =
action) for an ACL
>
>         =C2=A0=C2=A0 bound to a DOTS client, the DOTS server notifies t=
hat DOTS client
>
>         =C2=A0=C2=A0 with the change by including the corresponding ACL=
 parameters in an
>
>         =C2=A0=C2=A0 asynchronous notification (the DOTS client is obse=
rving the active
>
>         =C2=A0=C2=A0 mitigation) or in a response to a polling request =
(Section 4.4.2.2 of
>
>         =C2=A0=C2=A0 [I-D.ietf-dots-signal-channel]).
>
>         Do we need to say more?
>
>         Cheers,
>
>         Med
>
>         *De=C2=A0:*Jon Shallow [mailto:supjps-ietf@jpshallow.com]
>         *Envoy=C3=A9=C2=A0:* mercredi 15 mai 2019 11:56
>         *=C3=80=C2=A0:* BOUCADAIR Mohamed TGI/OLN; kaname nishizuka; Ko=
nda, Tirumaleswar Reddy; dots@ietf.org <mailto:dots@ietf.org>
>         *Objet=C2=A0:* RE: [Dots] draft-ietf-dots-filter-control: acl u=
pdates
>
>         Hi Guys,
>
>         I concur with (2).
>
>         I think that we have the =E2=80=98mid=E2=80=99 wrap properly co=
vered (more likely to occur now with lots of =E2=80=98tweaks=E2=80=99 to =
the mitigation when trying out different acl-lists).
>
>         With (2) changing the activation-types, it is possible that som=
e packets may not get through, and so an activation-type may be in an une=
xpected state.=C2=A0 I know=C2=A0 that we encourage regular monitor of th=
e status of a mitigation (by signal channel observing), but =C2=A0am unab=
le to find as to whether acl-list etc. is returned on signal channel GET =
response (there are no GET signal channel response examples).=C2=A0 There=
 was discussion about this on the mailing list, but it did not get a fina=
l resolution.
>
>         Regards
>
>         Jon
>
>         *From:*Dots [mailto: dots-bounces@ietf.org <mailto:dots-bounces=
@ietf.org>] *On Behalf Of *mohamed.boucadair@orange.com <mailto:mohamed.b=
oucadair@orange.com>
>         *Sent:* 15 May 2019 09:05
>         *To:* kaname nishizuka; Konda, Tirumaleswar Reddy; dots@ietf.or=
g <mailto:dots@ietf.org>
>         *Subject:* Re: [Dots] draft-ietf-dots-filter-control: acl updat=
es
>
>         Re-,
>
>         Thank you for sharing your thoughts.
>
>         -00 allows to use both a new or existing =E2=80=98mid=E2=80=99.=
 With (2) taken into account, we need the following change:
>
>         OLD:
>
>         =C2=A0=C2=A0 A DOTS client may include acl-* attributes in a mi=
tigation request
>
>         having a new or an existing 'mid'.=C2=A0 When acl-* attributes =
are to be
>
>         included in a mitigation request with an existing 'mid', the DO=
TS
>
>         client MUST repeat all the other parameters as sent in the orig=
inal
>
>         mitigation request (i.e., having that 'mid') apart from a possi=
ble
>
>         change to the lifetime parameter value.
>
>         NEW:
>
>         =C2=A0=C2=A0 During an attack time, DOTS clients may include 'a=
cl-list', 'acl-
>
>         =C2=A0=C2=A0 name', and 'activation-type' attributes in a mitig=
ation request.
>
>         =C2=A0=C2=A0 This request may be the initial mitigation request=
 for a given
>
>         =C2=A0=C2=A0 mitigation scope or a new one overriding an existi=
ng request.=C2=A0 In
>
>         =C2=A0=C2=A0 both case, a new 'mid' MUST be used.
>
>         =C2=A0=C2=A0 As the attack evolves, DOTS clients can adjust the=
 'activation-type'
>
>         =C2=A0=C2=A0 of an ACL conveyed in a mitigation request or cont=
rol other filters
>
>         =C2=A0=C2=A0 as necessary.=C2=A0 This can be achieved by sendin=
g a PUT request with a
>
>         =C2=A0=C2=A0 new 'mid' value.
>
>         Cheers,
>
>         Med
>
>         *De=C2=A0:*kaname nishizuka [mailto:kaname@nttv6.jp]
>         *Envoy=C3=A9=C2=A0:* mercredi 15 mai 2019 09:59
>         *=C3=80=C2=A0:* BOUCADAIR Mohamed TGI/OLN; Konda, Tirumaleswar =
Reddy; dots@ietf.org <mailto:dots@ietf.org>
>         *Objet=C2=A0:* Re: [Dots] draft-ietf-dots-filter-control: acl u=
pdates
>
>         Hi Tiru, Med,
>
>         I agree with Tiru.
>
>         > FWIW, the changes to implement (2) can be seen at:
>         >
>         > https://github.com/boucadair/filter-control/blob/master/wdiff=
%20draft-ietf-dots-signal-filter-control-00.txt%20draft-ietf-dots-signal-=
filter-control-01.pdf
>         >
>         Could you specify where it is?
>         (2) is taken account as the current version of the draft allows=
 to include acl attributes in requests with new =E2=80=98mid=E2=80=99s.
>
>         regards,
>         Kaname
>
>         On 2019/05/15 16:28, mohamed.boucadair@orange.com <mailto:moham=
ed.boucadair@orange.com> wrote:
>
>             Hi Tiru,
>
>             Agree.
>
>             Looking forward to hear =C2=A0more.
>
>             FWIW, the changes to implement (2) can be seen at:
>
>             https://github.com/boucadair/filter-control/blob/master/wdi=
ff%20draft-ietf-dots-signal-filter-control-00.txt%20draft-ietf-dots-signa=
l-filter-control-01.pdf
>
>             Cheers,
>
>             Med
>
>             *De=C2=A0:*Konda, Tirumaleswar Reddy [mailto:TirumaleswarRe=
ddy_Konda@McAfee.com]
>             *Envoy=C3=A9=C2=A0:* mercredi 15 mai 2019 09:11
>             *=C3=80=C2=A0:* BOUCADAIR Mohamed TGI/OLN; dots@ietf.org <m=
ailto:dots@ietf.org>
>             *Objet=C2=A0:* RE: draft-ietf-dots-filter-control: acl upda=
tes
>
>             I don=E2=80=99t think approach (1) is a good idea because o=
f out of order delivery of packets. Further, the anti-relay detection tec=
hnique in DTLS uses sliding windows procedure. An MITM can possibility ca=
che and drop the packets from the client, and replay the cached packets t=
hat fall within the sliding window. For instance in the below example, th=
e server could receive packets in the order T0, T4, T1, T2.
>
>             Monotonically increasing =E2=80=98mid=E2=80=99 is the only =
defense against this mechanism, and I don=E2=80=99t think the signal chan=
nel draft needs any update.
>
>             Cheers,
>
>             -Tiru
>
>             *From:*Dots <dots-bounces@ietf.org> <mailto:dots-bounces@ie=
tf.org> *On Behalf Of *mohamed.boucadair@orange.com <mailto:mohamed.bouca=
dair@orange.com>
>             *Sent:* Tuesday, May 14, 2019 8:14 PM
>             *To:* dots@ietf.org <mailto:dots@ietf.org>
>             *Subject:* [Dots] draft-ietf-dots-filter-control: acl updat=
es
>
>             *CAUTION*:External email. Do not click links or open attach=
ments unless you recognize the sender and know the content is safe.
>
>             -----------------------------------------------------------=
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>
>             Hi all,
>
>             The current version of the draft allows to include acl attr=
ibutes in requests with new or existing =E2=80=98mid=E2=80=99s. By =E2=80=
=9Cexisting mid=E2=80=99, we meant an existing request which does not inc=
lude acl attributes when the request was initially created. For such requ=
ests, the activation-type of the same acl can be changed as the attack ev=
olve or even control other ACLs. This is supposed to be covered by this t=
ext:
>
>             When acl-* attributes are to be
>
>             included in a mitigation request with an existing 'mid', th=
e DOTS
>
>             client MUST repeat all the other parameters as sent in the =
original
>
>             mitigation request (i.e., having that 'mid') apart from a p=
ossible
>
>             change to the lifetime parameter value.
>
>             For example:
>
>             T0: R(mid)
>
>             T1: R(mid, acl1, activation-type=3Dvalue1)
>
>             T2: R(mid, acl2, activation-type=3Dvalue2)
>
>             T3: R(mid, acl1, activation-type=3Dvalue2)
>
>             T4: R(mid)
>
>             ...
>
>             Now, if acl attributes are included in a request with a new=
 mid, we need to specify how activation-type (and acl-list in general) ca=
n be updated. We do have two options:
>
>              1. Update the draft with this NEW text:
>
>             =C2=A0=C2=A0 If 'acl-list', 'acl-name', and 'activation-typ=
e' attributes are
>
>             =C2=A0=C2=A0 included in the initial mitigation request (th=
at is, a mitigation
>
>             =C2=A0=C2=A0 request with a new 'mid'), the DOTS client may=
 update the
>
>             =C2=A0=C2=A0 'acl-list' as an active attack evolves.=C2=A0 =
To do so, the DOTS
>
>             =C2=A0=C2=A0 client MUST repeat all the other parameters as=
 sent in the original
>
>             =C2=A0=C2=A0 mitigation request apart from a possible chang=
e to the 'acl-list=E2=80=99
>
>             =C2=A0=C2=A0 and the lifetime parameter values.
>
>             =C2=A0=C2=A0 And the signal channel spec as follows:
>
>             =C2=A0=C2=A0 For a mitigation request to continue beyond th=
e initial negotiated
>
>             =C2=A0=C2=A0 lifetime, the DOTS client has to refresh the c=
urrent mitigation
>
>             =C2=A0=C2=A0 request by sending a new PUT request..=C2=A0 T=
his PUT request MUST use the
>
>             =C2=A0=C2=A0 same 'mid' value, and MUST repeat all the othe=
r parameters as sent in
>
>             =C2=A0=C2=A0 the original mitigation request apart from a p=
ossible change to the
>
>             =C2=A0=C2=A0 lifetime parameter value or other changes to a=
ttributes defined in future extensions.
>
>             =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^=
^^^^^^^^^^^^^^^
>
>             For example:
>
>             T0: R(mid, acl1, activation-type=3Dvalue1)
>
>             T1: R(mid, acl2, activation-type=3Dvalue2)
>
>             T2: R(mid, acl1, activation-type=3Dvalue2)
>
>             ..
>
>              2. Require a new mid each time a client has to insert acl =
attributes.
>
>             For example:
>
>             T0: R(mid0)
>
>             T1: R(mid1, acl1, activation-type=3Dvalue1)
>
>             T2: R(mid2, acl2, activation-type=3Dvalue2)
>
>             T3: R(mid3, acl1, activation-type=3Dvalue2)
>
>             ...
>
>             Thoughts?
>
>             Cheers,
>
>             Med
>
>             _______________________________________________
>
>             Dots mailing list
>
>             Dots@ietf.org  <mailto:Dots@ietf.org>
>
>             https://www.ietf.org/mailman/listinfo/dots
>
>
>
>
>         _______________________________________________
>
>         Dots mailing list
>
>         Dots@ietf.org  <mailto:Dots@ietf.org>
>
>         https://www.ietf.org/mailman/listinfo/dots
>
>
> _______________________________________________
> Dots mailing list
> Dots@ietf.org
> https://www.ietf.org/mailman/listinfo/dots


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    Yes.<br>
    <br>
    But if a new draft give us a solid interface of retrieving acl
    status (and its stats), it doesn't motivate me to implement observe
    stuff here.<br>
    Â <br>
    regards,<br>
    Kaname<br>
    <br>
    <div class="moz-cite-prefix">On 2019/05/24 21:52,
      <a class="moz-txt-link-abbreviated" href="mailto:mohamed.boucadair@orange.com">mohamed.boucadair@orange.com</a> wrote:<br>
    </div>
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      <div class="WordSection1">
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black">Hi Kaname,
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">The same notification
            can be sent many times to be sure the notification is
            successfully delivered.
            <o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">In both modes:
            <o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="text-indent:-18.0pt;mso-list:l4 level1 lfo7"><!--[if !supportLists]--><span
            style="font-size:10.0pt;font-family:Symbol;color:black"
            lang="EN-US"><span style="mso-list:Ignore">Â·<span
                style="font:7.0pt &quot;Times New Roman&quot;">Â Â Â Â Â Â Â Â 
              </span></span></span><!--[endif]--><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">the server needs to
            track changes on acls bound to a DOTS client. How the
            tracking is done is implementation-specific. Â <o:p></o:p></span></p>
        <p class="MsoListParagraph"
          style="text-indent:-18.0pt;mso-list:l4 level1 lfo7"><!--[if !supportLists]--><span
            style="font-size:10.0pt;font-family:Symbol;color:black"
            lang="EN-US"><span style="mso-list:Ignore">Â·<span
                style="font:7.0pt &quot;Times New Roman&quot;">Â Â Â Â Â Â Â Â 
              </span></span></span><!--[endif]--><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">the client needs to be
            prepared to receive acl attributes in the response. Â <o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">No?<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US"><o:p>Â </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">Cheers,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US">Med<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:&quot;Courier
            New&quot;;color:black" lang="EN-US"><o:p>Â </o:p></span></p>
        <div style="border:none;border-left:solid blue 1.5pt;padding:0cm
          0cm 0cm 4.0pt">
          <div>
            <div style="border:none;border-top:solid #B5C4DF
              1.0pt;padding:3.0pt 0cm 0cm 0cm">
              <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR"
                    lang="EN-US">DeÂ :</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR"
                  lang="EN-US"> Dots [<a class="moz-txt-link-freetext" href="mailto:dots-bounces@ietf.org">mailto:dots-bounces@ietf.org</a>] <b>De
                    la part de</b> kaname nishizuka<br>
                  <b>EnvoyÃ©Â :</b> vendredi 24 mai 2019 11:03<br>
                </span><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR">Ã€Â :</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR">
                  BOUCADAIR Mohamed TGI/OLN; Jon Shallow; <a class="moz-txt-link-abbreviated" href="mailto:dots@ietf.org">dots@ietf.org</a><br>
                  <b>ObjetÂ :</b> Re: [Dots]
                  draft-ietf-dots-filter-control: acl updates<o:p></o:p></span></p>
            </div>
          </div>
          <p class="MsoNormal"><o:p>Â </o:p></p>
          <p class="MsoNormal" style="margin-bottom:12.0pt"><br>
            Right, acl stats is not related to the excerpt spec.<br>
            <br>
            But I'm not fully convinced that the observe of the
            'activation-type' will be used.<br>
            Notification of the current state of 'activation-type' can
            be lost in attack time even though it's very important if an
            external action on DOTS server is unintended by the DOTS
            client.<br>
            So I prefer to use a polling request in 4.4.2.2.<br>
            It's an implementation specific, but I've just been
            wondering if there is an alternate to drop the specification
            of 'activation-type' observation.<br>
            <br>
            regards,<br>
            Kaname <o:p></o:p></p>
          <div>
            <p class="MsoNormal">On 2019/05/17 20:16, <a
                href="mailto:mohamed.boucadair@orange.com"
                moz-do-not-send="true">
                mohamed.boucadair@orange.com</a> wrote:<o:p></o:p></p>
          </div>
          <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
            <p class="MsoNormal"><span style="font-size:10.0pt">Re-,</span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt">Â </span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt"
                lang="EN-US">That excerpt from the filter-control draft
                is not related to acl stats.</span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt"
                lang="EN-US">Â </span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt"
                lang="EN-US">Can you please clarify what would be the
                implications on the filter-control draft if acl-stats
                are allowed to be returned in GET responses?
              </span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt"
                lang="EN-US">Â </span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt"
                lang="EN-US">Thank you. </span>
              <o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt"
                lang="EN-US">Â </span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt"
                lang="EN-US">Cheers,</span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt"
                lang="EN-US">Med</span><o:p></o:p></p>
            <p class="MsoNormal"><span style="font-size:10.0pt"
                lang="EN-US">Â </span><o:p></o:p></p>
            <div style="border:none;border-left:solid blue
              1.5pt;padding:0cm 0cm 0cm 4.0pt">
              <div>
                <div style="border:none;border-top:solid #B5C4DF
                  1.0pt;padding:3.0pt 0cm 0cm 0cm">
                  <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR">DeÂ :</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR">
                      Dots [<a href="mailto:dots-bounces@ietf.org"
                        moz-do-not-send="true">mailto:dots-bounces@ietf.org</a>]
                      <b>De la part de</b> kaname nishizuka<br>
                      <b>EnvoyÃ©Â :</b> vendredi 17 mai 2019 12:00<br>
                      <b>Ã€Â :</b> Jon Shallow; BOUCADAIR Mohamed TGI/OLN;
                      <a href="mailto:dots@ietf.org"
                        moz-do-not-send="true">
                        dots@ietf.org</a><br>
                      <b>ObjetÂ :</b> Re: [Dots]
                      draft-ietf-dots-filter-control: acl updates</span><o:p></o:p></p>
                </div>
              </div>
              <p class="MsoNormal">Â <o:p></o:p></p>
              <p class="MsoNormal" style="margin-bottom:12.0pt">Hi,<br>
                <br>
                As the conclusion of the discussion about ACL Stats
                issue, there will be a draft about retrieving ACL Stats
                over the signal-channel WITHOUT respect to whether ACLs
                are activated via signal-filter-control.<br>
                <br>
                I'd like to note that when it came out, the GET response
                spec in signal-filter-control would be subject to
                change.<br>
                Basically, this current specification introduces
                implementation complexity.<br>
                &gt;Â Â Â  If, during an active mitigation, the
                'activation-type' is changed at<br>
                &gt;Â Â Â  the DOTS server (e.g., as a result of an
                external action) for an ACL<br>
                &gt;Â Â Â  bound to a DOTS client, the DOTS server notifies
                that DOTS client<br>
                &gt;Â Â Â  with the change by including the corresponding
                ACL parameters in an<br>
                &gt;Â Â Â  asynchronous notification (the DOTS client is
                observing the active<br>
                &gt;Â Â Â  mitigation) or in a response to a polling
                request (Section 4.4.2.2 of<br>
                &gt;Â Â Â  [I-D.ietf-dots-signal-channel]).<br>
                <br>
                regards,<br>
                Kaname<br>
                <br>
                <br>
                <o:p></o:p></p>
              <div>
                <p class="MsoNormal">On 2019/05/15 22:52, Jon Shallow
                  wrote:<o:p></o:p></p>
              </div>
              <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
                <p class="MsoNormal"><span style="color:#1F497D">Hi Med,</span><o:p></o:p></p>
                <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                <p class="MsoNormal"><span style="color:#1F497D">I think
                    that covers it.Â  Now I have access to my emails, it
                    was the PUT that I was thinking about, not the GET.</span><o:p></o:p></p>
                <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                <p class="MsoNormal"><span style="color:#1F497D">Regards</span><o:p></o:p></p>
                <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                <p class="MsoNormal"><span style="color:#1F497D">Jon</span><o:p></o:p></p>
                <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                <div style="border:none;border-left:solid blue
                  1.5pt;padding:0cm 0cm 0cm 4.0pt">
                  <div>
                    <div style="border:none;border-top:solid #B5C4DF
                      1.0pt;padding:3.0pt 0cm 0cm 0cm">
                      <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:EN-GB"
                            lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:EN-GB"
                          lang="EN-US"> Dots [mailto: <a
                            href="mailto:dots-bounces@ietf.org"
                            moz-do-not-send="true">dots-bounces@ietf.org</a>]
                          <b>
                            On Behalf Of </b><a
                            href="mailto:mohamed.boucadair@orange.com"
                            moz-do-not-send="true">mohamed.boucadair@orange.com</a><br>
                          <b>Sent:</b> 15 May 2019 12:22<br>
                          <b>To:</b> Jon Shallow; <a
                            href="mailto:dots@ietf.org"
                            moz-do-not-send="true">dots@ietf.org</a><br>
                          <b>Subject:</b> Re: [Dots]
                          draft-ietf-dots-filter-control: acl updates</span><o:p></o:p></p>
                    </div>
                  </div>
                  <p class="MsoNormal">Â <o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Re-,
                    </span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Â </span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Noted.
                      Thanks.
                    </span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Â </span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">With
                      regards to your second point, we do have the
                      following in the draft:</span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Â </span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="font-size:10.0pt"
                      lang="EN-US">Â Â  If, during an active mitigation,
                      the 'activation-type' is changed at</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="font-size:10.0pt"
                      lang="EN-US">Â Â  the DOTS server (e.g., as a result
                      of an external action) for an ACL</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="font-size:10.0pt"
                      lang="EN-US">Â Â  bound to a DOTS client, the DOTS
                      server notifies that DOTS client</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="font-size:10.0pt"
                      lang="EN-US">Â Â  with the change by including the
                      corresponding ACL parameters in an</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="font-size:10.0pt"
                      lang="EN-US">Â Â  asynchronous notification (the
                      DOTS client is observing the active</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="font-size:10.0pt"
                      lang="EN-US">Â Â  mitigation) or in a response to a
                      polling request (Section 4.4.2.2 of</span><o:p></o:p></p>
                  <p class="MsoNormal"><span style="font-size:10.0pt"
                      lang="EN-US">Â Â  [I-D.ietf-dots-signal-channel]).</span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Â </span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Do
                      we need to say more?
                    </span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Â </span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Cheers,</span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Med</span><o:p></o:p></p>
                  <p class="MsoNormal"><span
                      style="font-size:10.0pt;font-family:&quot;Courier
                      New , serif&quot;,&quot;serif&quot;" lang="EN-US">Â </span><o:p></o:p></p>
                  <div style="border:none;border-left:solid blue
                    1.5pt;padding:0cm 0cm 0cm 4.0pt">
                    <div>
                      <div style="border:none;border-top:solid #B5C4DF
                        1.0pt;padding:3.0pt 0cm 0cm 0cm">
                        <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR"
                              lang="EN-US">DeÂ :</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR"
                            lang="EN-US"> Jon Shallow [<a
                              href="mailto:supjps-ietf@jpshallow.com"
                              moz-do-not-send="true">mailto:supjps-ietf@jpshallow.com</a>]
                            <br>
                            <b>EnvoyÃ©Â :</b> mercredi 15 mai 2019 11:56<br>
                            <b>Ã€Â :</b> BOUCADAIR Mo</span><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR">hamed
                            TGI/OLN; kaname nishizuka; Konda,
                            Tirumaleswar Reddy;
                            <a href="mailto:dots@ietf.org"
                              moz-do-not-send="true">dots@ietf.org</a><br>
                            <b>ObjetÂ :</b> RE: [Dots]
                            draft-ietf-dots-filter-control: acl updates</span><o:p></o:p></p>
                      </div>
                    </div>
                    <p class="MsoNormal">Â <o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">Hi
                        Guys,</span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">I
                        concur with (2).</span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">I
                        think that we have the â€˜midâ€™ wrap properly
                        covered (more likely to occur now with lots of
                        â€˜tweaksâ€™ to the mitigation when trying out
                        different acl-lists).</span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">With
                        (2) changing the activation-types, it is
                        possible that some packets may not get through,
                        and so an activation-type may be in an
                        unexpected state.Â  I knowÂ  that we encourage
                        regular monitor of the status of a mitigation
                        (by signal channel observing), but Â am unable to
                        find as to whether acl-list etc. is returned on
                        signal channel GET response (there are no GET
                        signal channel response examples).Â  There was
                        discussion about this on the mailing list, but
                        it did not get a final resolution.</span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">Regards</span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">Jon</span><o:p></o:p></p>
                    <p class="MsoNormal"><span style="color:#1F497D">Â </span><o:p></o:p></p>
                    <div style="border:none;border-left:solid blue
                      1.5pt;padding:0cm 0cm 0cm 4.0pt">
                      <div>
                        <div style="border:none;border-top:solid #B5C4DF
                          1.0pt;padding:3.0pt 0cm 0cm 0cm">
                          <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:EN-GB"
                                lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:EN-GB"
                              lang="EN-US"> Dots [mailto: <a
                                href="mailto:dots-bounces@ietf.org"
                                moz-do-not-send="true">dots-bounces@ietf.org</a>]
                              <b>
                                On Behalf Of </b><a
                                href="mailto:mohamed.boucadair@orange.com"
                                moz-do-not-send="true">mohamed.boucadair@orange.com</a><br>
                              <b>Sent:</b> 15 May 2019 09:05<br>
                              <b>To:</b> kaname nishizuka; Konda,
                              Tirumaleswar Reddy; <a
                                href="mailto:dots@ietf.org"
                                moz-do-not-send="true">
                                dots@ietf.org</a><br>
                              <b>Subject:</b> Re: [Dots]
                              draft-ietf-dots-filter-control: acl
                              updates</span><o:p></o:p></p>
                        </div>
                      </div>
                      <p class="MsoNormal">Â <o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Re-,</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â </span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Thank you for sharing your
                          thoughts.</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â </span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">-00 allows to use both a new or
                          existing â€˜midâ€™. With (2) taken into account,
                          we need the following change:</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â </span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">OLD:</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â </span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt" lang="EN-US">Â Â  A
                          DOTS client may include acl-* attributes in a
                          mitigation request</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt" lang="EN-US">Â Â 
                          having a new or an existing 'mid'.Â  When acl-*
                          attributes are to be</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt" lang="EN-US">Â Â 
                          included in a mitigation request with an
                          existing 'mid', the DOTS</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt" lang="EN-US">Â Â 
                          client MUST repeat all the other parameters as
                          sent in the original</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt" lang="EN-US">Â Â 
                          mitigation request (i.e., having that 'mid')
                          apart from a possible</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt" lang="EN-US">Â Â 
                          change to the lifetime parameter value.</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â </span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">NEW:</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â Â  During an attack time, DOTS
                          clients may include 'acl-list', 'acl-</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â Â  name', and 'activation-type'
                          attributes in a mitigation request.</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â Â  This request may be the
                          initial mitigation request for a given</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â Â  mitigation scope or a new one
                          overriding an existing request.Â  In</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â Â  both case, a new 'mid' MUST be
                          used.</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â </span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â Â  As the attack evolves, DOTS
                          clients can adjust the 'activation-type'</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â Â  of an ACL conveyed in a
                          mitigation request or control other filters</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â Â  as necessary.Â  This can be
                          achieved by sending a PUT request with a</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â Â  new 'mid' value.</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â </span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Cheers,</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Med</span><o:p></o:p></p>
                      <p class="MsoNormal"><span
                          style="font-size:10.0pt;font-family:&quot;Courier
                          New , serif&quot;,&quot;serif&quot;"
                          lang="EN-US">Â </span><o:p></o:p></p>
                      <div style="border:none;border-left:solid blue
                        1.5pt;padding:0cm 0cm 0cm 4.0pt">
                        <div>
                          <div style="border:none;border-top:solid
                            #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
                            <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR"
                                  lang="EN-US">DeÂ :</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR"
                                lang="EN-US"> kaname nishizuka [<a
                                  href="mailto:kaname@nttv6.jp"
                                  moz-do-not-send="true">mailto:kaname@nttv6.jp</a>]
                                <br>
                                <b>EnvoyÃ©Â :</b> mercredi 15 mai 2019
                                09:59<br>
                                <b>Ã€Â :</b> BOUCADA</span><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;color:windowtext;mso-fareast-language:FR">IR
                                Mohamed TGI/OLN; Konda, Tirumaleswar
                                Reddy;
                                <a href="mailto:dots@ietf.org"
                                  moz-do-not-send="true">dots@ietf.org</a><br>
                                <b>ObjetÂ :</b> Re: [Dots]
                                draft-ietf-dots-filter-control: acl
                                updates</span><o:p></o:p></p>
                          </div>
                        </div>
                        <p class="MsoNormal">Â <o:p></o:p></p>
                        <p class="MsoNormal"
                          style="margin-bottom:12.0pt">Hi Tiru, Med,<br>
                          <br>
                          I agree with Tiru.<br>
                          <br>
                          &gt; FWIW, the changes to implement (2) can be
                          seen at:<br>
                          &gt;<br>
                          &gt; <a
href="https://github.com/boucadair/filter-control/blob/master/wdiff%20draft-ietf-dots-signal-filter-control-00.txt%20draft-ietf-dots-signal-filter-control-01.pdf"
                            moz-do-not-send="true">
https://github.com/boucadair/filter-control/blob/master/wdiff%20draft-ietf-dots-signal-filter-control-00.txt%20draft-ietf-dots-signal-filter-control-01.pdf</a><br>
                          &gt;<br>
                          Could you specify where it is?<br>
                          (2) is taken account as the current version of
                          the draft allows to include acl attributes in
                          requests with new â€˜midâ€™s.<br>
                          <br>
                          regards,<br>
                          Kaname<o:p></o:p></p>
                        <div>
                          <p class="MsoNormal">On 2019/05/15 16:28, <a
                              href="mailto:mohamed.boucadair@orange.com"
                              moz-do-not-send="true">
                              mohamed.boucadair@orange.com</a> wrote:<o:p></o:p></p>
                        </div>
                        <blockquote
                          style="margin-top:5.0pt;margin-bottom:5.0pt">
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt">Hi Tiru, </span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt">Â </span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt" lang="EN-US">Agree.
                            </span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt" lang="EN-US">Â </span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt" lang="EN-US">Looking
                              forward to hear Â more.
                            </span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt" lang="EN-US">Â </span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt" lang="EN-US">FWIW,
                              the changes to implement (2) can be seen
                              at:
                            </span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt"><a
href="https://github.com/boucadair/filter-control/blob/master/wdiff%20draft-ietf-dots-signal-filter-control-00.txt%20draft-ietf-dots-signal-filter-control-01.pdf"
                                moz-do-not-send="true"><span
                                  lang="EN-US">https://github.com/boucadair/filter-control/blob/master/wdiff%20draft-ietf-dots-signal-filter-control-00.txt%20draft-ietf-dots-signal-filter-control-01.pdf</span></a>
                            </span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt" lang="EN-US">Â </span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt">Cheers,</span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt">Med</span><o:p></o:p></p>
                          <p class="MsoNormal"><span
                              style="font-size:10.0pt">Â </span><o:p></o:p></p>
                          <div style="border:none;border-left:solid blue
                            1.5pt;padding:0cm 0cm 0cm 4.0pt">
                            <div>
                              <div style="border:none;border-top:solid
                                #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
                                <p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-fareast-language:FR">DeÂ :</span></b><span
style="font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-fareast-language:FR">
                                    Konda, Tirumaleswar Reddy [<a
                                      href="mailto:TirumaleswarReddy_Konda@McAfee.com"
                                      moz-do-not-send="true">mailto:TirumaleswarReddy_Konda@McAfee.com</a>]
                                    <br>
                                    <b>EnvoyÃ©Â :</b> mercredi 15 mai 2019
                                    09:11<br>
                                    <b>Ã€Â :</b> BOUCADAIR Mohamed
                                    TGI/OLN; <a
                                      href="mailto:dots@ietf.org"
                                      moz-do-not-send="true">dots@ietf.org</a><br>
                                    <b>ObjetÂ :</b> RE:
                                    draft-ietf-dots-filter-control: acl
                                    updates</span><o:p></o:p></p>
                              </div>
                            </div>
                            <p class="MsoNormal">Â <o:p></o:p></p>
                            <p class="MsoNormal"><span
                                style="mso-fareast-language:ZH-CN"
                                lang="EN-US">I donâ€™t think approach (1)
                                is a good idea because of out of order
                                delivery of packets. Further, the
                                anti-relay detection technique in DTLS
                                uses sliding windows procedure. An MITM
                                can possibility cache and drop the
                                packets from the client, and replay the
                                cached packets that fall within the
                                sliding window. For instance in the
                                below example, the server could receive
                                packets in the order T0, T4, T1, T2.
                              </span><o:p></o:p></p>
                            <p class="MsoNormal"><span
                                style="mso-fareast-language:ZH-CN"
                                lang="EN-US">Â </span><o:p></o:p></p>
                            <p class="MsoNormal"><span
                                style="mso-fareast-language:ZH-CN"
                                lang="EN-US">Monotonically increasing
                                â€˜midâ€™ is the only defense against this
                                mechanism, and I donâ€™t think the signal
                                channel draft needs any update. Â </span><o:p></o:p></p>
                            <p class="MsoNormal"><span
                                style="mso-fareast-language:ZH-CN"
                                lang="EN-US">Â </span><o:p></o:p></p>
                            <p class="MsoNormal"><span
                                style="mso-fareast-language:ZH-CN"
                                lang="EN-US">Cheers,</span><o:p></o:p></p>
                            <p class="MsoNormal"><span
                                style="mso-fareast-language:ZH-CN"
                                lang="EN-US">-Tiru</span><o:p></o:p></p>
                            <p class="MsoNormal"><span
                                style="mso-fareast-language:ZH-CN"
                                lang="EN-US">Â </span><o:p></o:p></p>
                            <div style="border:none;border-left:solid
                              blue 1.5pt;padding:0cm 0cm 0cm 4.0pt">
                              <div>
                                <div style="border:none;border-top:solid
                                  #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm
                                  0cm">
                                  <p class="MsoNormal"><b><span
                                        style="mso-fareast-language:ZH-CN"
                                        lang="EN-US">From:</span></b><span
                                      style="mso-fareast-language:ZH-CN"
                                      lang="EN-US"> Dots
                                      <a
                                        href="mailto:dots-bounces@ietf.org"
                                        moz-do-not-send="true">&lt;dots-bounces@ietf.org&gt;</a>
                                      <b>On Behalf Of
                                      </b><a
                                        href="mailto:mohamed.boucadair@orange.com"
                                        moz-do-not-send="true">mohamed.boucadair@orange.com</a><br>
                                      <b>Sent:</b> Tuesday, May 14, 2019
                                      8:14 PM<br>
                                      <b>To:</b> <a
                                        href="mailto:dots@ietf.org"
                                        moz-do-not-send="true">dots@ietf.org</a><br>
                                      <b>Subject:</b> [Dots]
                                      draft-ietf-dots-filter-control:
                                      acl updates</span><o:p></o:p></p>
                                </div>
                              </div>
                              <p class="MsoNormal"><span lang="EN-US">Â </span><o:p></o:p></p>
                              <div>
                                <table class="MsoNormalTable"
                                  style="background:#F3FF33;border:solid
                                  #9B9A87 1.5pt" cellpadding="0"
                                  border="1">
                                  <tbody>
                                    <tr>
                                      <td style="border:none;padding:0cm
                                        0cm 0cm 0cm ..75pt">
                                        <p><strong><span
style="font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#9B8B3E">CAUTION</span></strong><span
style="font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;color:#9B8B3E">:</span><span
style="font-family:&quot;Arial&quot;,&quot;sans-serif&quot;"> External
                                            email. Do not click links or
                                            open attachments unless you
                                            recognize the sender and
                                            know the content is safe.</span><o:p></o:p></p>
                                      </td>
                                    </tr>
                                  </tbody>
                                </table>
                                <div class="MsoNormal"
                                  style="text-align:center"
                                  align="center"><span
                                    style="mso-fareast-language:ZH-CN">
                                    <hr width="100%" size="2"
                                      align="center">
                                  </span></div>
                              </div>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;">Hi
                                  all,
                                </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">The current version of
                                  the draft allows to include acl
                                  attributes in requests with new or
                                  existing â€˜midâ€™s. By â€œexisting midâ€™, we
                                  meant an existing request which does
                                  not include acl attributes when the
                                  request was initially created. For
                                  such requests, the activation-type of
                                  the same acl can be changed as the
                                  attack evolve or even control other
                                  ACLs. This is supposed to be covered
                                  by this text:
                                </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt" lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt" lang="EN-US">Â Â 
                                  When acl-* attributes are to be</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt" lang="EN-US">Â Â 
                                  included in a mitigation request with
                                  an existing 'mid', the DOTS</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt" lang="EN-US">Â Â 
                                  client MUST repeat all the other
                                  parameters as sent in the original</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt" lang="EN-US">Â Â 
                                  mitigation request (i.e., having that
                                  'mid') apart from a possible</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt" lang="EN-US">Â Â 
                                  change to the lifetime parameter
                                  value.</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">For example:
                                </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T0: R(mid)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T1: R(mid, acl1,
                                  activation-type=value1)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T2: R(mid, acl2,
                                  activation-type=value2)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T3: R(mid, acl1,
                                  activation-type=value2)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T4: R(mid)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">...</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Now, if acl attributes
                                  are included in a request with a new
                                  mid, we need to specify how
                                  activation-type (and acl-list in
                                  general) can be updated. We do have
                                  two options:</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <ol style="margin-top:0cm" start="1"
                                type="1">
                                <li class="MsoNormal" style="mso-list:l1
                                  level1 lfo3"><span
                                    style="font-size:10.0pt;font-family:&quot;Courier
                                    New , serif&quot;,&quot;serif&quot;"
                                    lang="EN-US">Update the draft with
                                    this NEW text:</span><o:p></o:p></li>
                              </ol>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  If 'acl-list', 'acl-name', and 'activation-type' attributes are</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  included in the initial mitigation request (that is, a mitigation</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  request with a new 'mid'), the DOTS client may update the</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  'acl-list' as an active attack evolves.Â  To do so, the DOTS</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  client MUST repeat all the other parameters as sent in the original</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  mitigation request apart from a possible change to the 'acl-listâ€™</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  and the lifetime parameter values.</span><o:p></o:p></pre>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â Â  And the signal channel
                                  spec as follows:</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  For a mitigation request to continue beyond the initial negotiated</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  lifetime, the DOTS client has to refresh the current mitigation</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  request by sending a new PUT request..Â  This PUT request MUST use the</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  same 'mid' value, and MUST repeat all the other parameters as sent in</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  the original mitigation request apart from a possible change to the</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â  lifetime parameter value or other changes to attributes defined in future extensions.</span><o:p></o:p></pre>
                              <pre><span style="font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-fareast-language:FR" lang="EN-US">Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^Â Â  </span><o:p></o:p></pre>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">For example:
                                </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T0: R(mid, acl1,
                                  activation-type=value1)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T1: R(mid, acl2,
                                  activation-type=value2)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T2: R(mid, acl1,
                                  activation-type=value2)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">..</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <ol style="margin-top:0cm" start="2"
                                type="1">
                                <li class="MsoNormal" style="mso-list:l0
                                  level1 lfo6"><span
                                    style="font-size:10.0pt;font-family:&quot;Courier
                                    New , serif&quot;,&quot;serif&quot;"
                                    lang="EN-US">Require a new mid each
                                    time a client has to insert acl
                                    attributes.
                                  </span><o:p></o:p></li>
                              </ol>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">For example:
                                </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T0: R(mid0)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T1: R(mid1, acl1,
                                  activation-type=value1)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T2: R(mid2, acl2,
                                  activation-type=value2)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">T3: R(mid3, acl1,
                                  activation-type=value2)</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">...</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Thoughts?</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Cheers,</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Med</span><o:p></o:p></p>
                              <p class="MsoNormal"><span
                                  style="font-size:10.0pt;font-family:&quot;Courier
                                  New , serif&quot;,&quot;serif&quot;"
                                  lang="EN-US">Â </span><o:p></o:p></p>
                            </div>
                          </div>
                          <p class="MsoNormal"
                            style="margin-bottom:12.0pt"><span
                              style="font-size:12.0pt">Â </span><o:p></o:p></p>
                          <pre>_______________________________________________<o:p></o:p></pre>
                          <pre>Dots mailing list<o:p></o:p></pre>
                          <pre><a href="mailto:Dots@ietf.org" moz-do-not-send="true">Dots@ietf.org</a><o:p></o:p></pre>
                          <pre><a href="https://www.ietf.org/mailman/listinfo/dots" moz-do-not-send="true">https://www.ietf.org/mailman/listinfo/dots</a><o:p></o:p></pre>
                        </blockquote>
                        <p class="MsoNormal"><span
                            style="font-size:12.0pt">Â </span><o:p></o:p></p>
                      </div>
                    </div>
                  </div>
                </div>
                <p class="MsoNormal"><span style="font-size:12.0pt"><br>
                    <br>
                    <br>
                  </span><o:p></o:p></p>
                <pre>_______________________________________________<o:p></o:p></pre>
                <pre>Dots mailing list<o:p></o:p></pre>
                <pre><a href="mailto:Dots@ietf.org" moz-do-not-send="true">Dots@ietf.org</a><o:p></o:p></pre>
                <pre><a href="https://www.ietf.org/mailman/listinfo/dots" moz-do-not-send="true">https://www.ietf.org/mailman/listinfo/dots</a><o:p></o:p></pre>
              </blockquote>
              <p class="MsoNormal"><span style="font-size:12.0pt">Â </span><o:p></o:p></p>
            </div>
          </blockquote>
          <p class="MsoNormal"><span
              style="font-size:12.0pt;font-family:&quot;Times New
              Roman&quot;,&quot;serif&quot;;mso-fareast-language:FR"><o:p>Â </o:p></span></p>
        </div>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <pre class="moz-quote-pre" wrap="">_______________________________________________
Dots mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Dots@ietf.org">Dots@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/dots">https://www.ietf.org/mailman/listinfo/dots</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>

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Date: Wed, 5 Jun 2019 18:16:21 +0800
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3Dutf-8"><style>body { line-height: 1.5; }blockquote { margin-top: 0px; =
margin-bottom: 0px; margin-left: 0.5em; }body { font-size: 10.5pt; font-fa=
mily: =E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91; color: rgb(0, 0, 0); line-heig=
ht: 1.5; }</style></head><body>=0A<div><span></span>Hi Med,</div><div><spa=
n style=3D"font-size: 10.5pt; line-height: 1.5; background-color: transpar=
ent;">I have a question of dots-signal-call-home, &nbsp;i</span>s it &nbsp=
;a special version of dots signal channel?&nbsp;</div><div><br></div><div>=
best wishes.</div><div>Meiling Chen.</div><blockquote style=3D"margin-Top:=
 0px; margin-Bottom: 0px; margin-Left: 0.5em"><div style=3D"border:none;bo=
rder-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADD=
ING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLO=
R:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><di=
v><b>From:</b>&nbsp;<a href=3D"mailto:mohamed.boucadair@orange.com">mohame=
d.boucadair@orange.com</a></div><div><b>Date:</b>&nbsp;2019-05-31&nbsp;22:=
44</div><div><b>To:</b>&nbsp;<a href=3D"mailto:dots@ietf.org">dots@ietf.or=
g</a></div><div><b>Subject:</b>&nbsp;Re: [Dots] I-D Action: draft-ietf-dot=
s-signal-call-home-02.txt</div></div></div><div><div>Hi all, </div>=0A<div=
>&nbsp;</div>=0A<div>We updated the draft with the following main changes:=
 </div>=0A<div>* Specify the heartbeat mechanism for call home. The in the=
 base spec won't be valid. </div>=0A<div>* Clarify that preconfigured miti=
gations are not allowed for call home.</div>=0A<div>&nbsp;</div>=0A<div>Pl=
ease review. </div>=0A<div>&nbsp;</div>=0A<div>Cheers,</div>=0A<div>Med</d=
iv>=0A<div>&nbsp;</div>=0A<div>&gt; -----Message d'origine-----</div>=0A<d=
iv>&gt; De&nbsp;: Dots [mailto:dots-bounces@ietf.org] De la part de intern=
et-</div>=0A<div>&gt; drafts@ietf.org</div>=0A<div>&gt; Envoy=C3=A9&nbsp;:=
 vendredi 31 mai 2019 16:41</div>=0A<div>&gt; =C3=80&nbsp;: i-d-announce@i=
etf.org</div>=0A<div>&gt; Cc&nbsp;: dots@ietf.org</div>=0A<div>&gt; Objet&=
nbsp;: [Dots] I-D Action: draft-ietf-dots-signal-call-home-02.txt</div>=0A=
<div>&gt; </div>=0A<div>&gt; </div>=0A<div>&gt; A New Internet-Draft is av=
ailable from the on-line Internet-Drafts</div>=0A<div>&gt; directories.</d=
iv>=0A<div>&gt; This draft is a work item of the DDoS Open Threat Signalin=
g WG of the</div>=0A<div>&gt; IETF.</div>=0A<div>&gt; </div>=0A<div>&gt;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Title&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : Distributed Denial-of-Service Ope=
n Threat</div>=0A<div>&gt; Signaling (DOTS) Signal Channel Call Home</div>=
=0A<div>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Authors&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : Tirumaleswar Reddy</div>=0A<d=
iv>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Mohamed Boucadair</div>=0A<div>&gt;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Jon Shallow</d=
iv>=0A<div>&gt; 	Filename&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : draf=
t-ietf-dots-signal-call-home-02.txt</div>=0A<div>&gt; 	Pages&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 24</div>=0A<div>&gt; 	Dat=
e&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 2019=
-05-31</div>=0A<div>&gt; </div>=0A<div>&gt; Abstract:</div>=0A<div>&gt;&nb=
sp;&nbsp;&nbsp; This document specifies the DOTS signal channel Call Home =
service,</div>=0A<div>&gt;&nbsp;&nbsp;&nbsp; which enables a DOTS server t=
o initiate a secure connection to a DOTS</div>=0A<div>&gt;&nbsp;&nbsp;&nbs=
p; client, and to receive the attack traffic information from the DOTS</di=
v>=0A<div>&gt;&nbsp;&nbsp;&nbsp; client.&nbsp; The DOTS server in turn use=
s the attack traffic information</div>=0A<div>&gt;&nbsp;&nbsp;&nbsp; to id=
entify the compromised devices launching the outgoing DDoS</div>=0A<div>&g=
t;&nbsp;&nbsp;&nbsp; attack and takes appropriate mitigation action(s).</d=
iv>=0A<div>&gt; </div>=0A<div>&gt;&nbsp;&nbsp;&nbsp; The DOTS Call Home se=
rvice is not specific to the home networks; the</div>=0A<div>&gt;&nbsp;&nb=
sp;&nbsp; solution targets any deployment which requires to block DDoS att=
ack</div>=0A<div>&gt;&nbsp;&nbsp;&nbsp; traffic closer to the source(s) of=
 a DDoS attack.</div>=0A<div>&gt; </div>=0A<div>&gt; </div>=0A<div>&gt; Th=
e IETF datatracker status page for this draft is:</div>=0A<div>&gt; https:=
//datatracker.ietf.org/doc/draft-ietf-dots-signal-call-home/</div>=0A<div>=
&gt; </div>=0A<div>&gt; There are also htmlized versions available at:</di=
v>=0A<div>&gt; https://tools.ietf.org/html/draft-ietf-dots-signal-call-hom=
e-02</div>=0A<div>&gt; https://datatracker.ietf.org/doc/html/draft-ietf-do=
ts-signal-call-home-02</div>=0A<div>&gt; </div>=0A<div>&gt; A diff from th=
e previous version is available at:</div>=0A<div>&gt; https://www.ietf.org=
/rfcdiff?url2=3Ddraft-ietf-dots-signal-call-home-02</div>=0A<div>&gt; </di=
v>=0A<div>&gt; </div>=0A<div>&gt; Please note that it may take a couple of=
 minutes from the time of</div>=0A<div>&gt; submission</div>=0A<div>&gt; u=
ntil the htmlized version and diff are available at tools.ietf.org.</div>=
=0A<div>&gt; </div>=0A<div>&gt; Internet-Drafts are also available by anon=
ymous FTP at:</div>=0A<div>&gt; ftp://ftp.ietf.org/internet-drafts/</div>=
=0A<div>&gt; </div>=0A<div>&gt; __________________________________________=
_____</div>=0A<div>&gt; Dots mailing list</div>=0A<div>&gt; Dots@ietf.org<=
/div>=0A<div>&gt; https://www.ietf.org/mailman/listinfo/dots</div>=0A<div>=
&nbsp;</div>=0A<div>_______________________________________________</div>=
=0A<div>Dots mailing list</div>=0A<div>Dots@ietf.org</div>=0A<div>https://=
www.ietf.org/mailman/listinfo/dots</div>=0A<div>&nbsp;</div>=0A</div></blo=
ckquote></body></html>
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To: MeiLing Chen <chenmeiling@chinamobile.com>, dots <dots@ietf.org>
Thread-Topic: Re: [Dots] I-D Action: draft-ietf-dots-signal-call-home-02.txt
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Date: Wed, 5 Jun 2019 14:35:00 +0000
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Subject: Re: [Dots] I-D Action: draft-ietf-dots-signal-call-home-02.txt
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From: "Panwei (William)" <william.panwei@huawei.com>
To: dots <dots@ietf.org>
Thread-Topic: Some comments on draft-ietf-dots-signal-call-home-02
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Date: Wed, 26 Jun 2019 08:25:01 +0000
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Subject: [Dots] Some comments on draft-ietf-dots-signal-call-home-02
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<div class=3D"WordSection1">
<p class=3D"MsoNormal" style=3D"margin:0cm;margin-bottom:.0001pt"><span sty=
le=3D"font-family:&quot;Gadugi&quot;,sans-serif">Hi authors,<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin:0cm;margin-bottom:.0001pt"><span sty=
le=3D"font-family:&quot;Gadugi&quot;,sans-serif"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"margin:0cm;margin-bottom:.0001pt"><span sty=
le=3D"font-family:&quot;Gadugi&quot;,sans-serif">I=A1=AFve read the latest =
version draft, and I have the following comments:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin:0cm;margin-bottom:.0001pt"><span sty=
le=3D"font-family:&quot;Gadugi&quot;,sans-serif"><o:p>&nbsp;</o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">Some nits:<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">1. In Section 1.1=
, the second paragraph, s/at affordable price/at affordable prices/.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">2. In Section 1.1=
, the second last paragraph, s/a IPv6 home network/an IPv6 home network/.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">3. In Section 2, =
the reference I-D.ietf-dots-requirements should be changed to RFC8612.<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">4. In Section 3.3=
.1, Figure 4 and Figure 5, s/NAT Embeded in a CPE/NAT Embedded in a CPE/.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">5. In section 5, =
the third paragraph, s/inspect all the traffic from the compromised to the =
target/inspect all the traffic from the compromised device to the target/.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">Comments:<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">1. The Section 3.=
3.1 contains three things: the new parameters of the mitigation request, th=
e considerations of NAT deployment, the extension of conflict-clause. These=
 3 things make this section too long. For a
 better structure and readability, my suggestion is to split this section i=
nto 3 sections, or at least to put the NAT considerations into a separate s=
ection.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:0cm;mso-para-margin-rig=
ht:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">2. In Section 3.3=
.1, when describing the source-port-range, it says:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">For TCP, U=
DP, Stream Control Transmission Protocol (SCTP)<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">[RFC4960],=
 or Datagram Congestion Control Protocol (DCCP)<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">[RFC4340],=
 a range of ports can be, for example, 0-1023,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">1024-65535=
, or 1024-49151.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">My understanding =
of these 3 examples is that they want to show the readers the ports can ran=
ge from 0 to 65535. It=A1=AFs better to say this explicitly before listing =
the examples.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">3. In Section 3.3=
.1, it uses =A1=AEsource-icmp-type=A1=AF when explaining this new parameter=
, while other places using =A1=AEsource-icmp-type-range=A1=AF. I think =A1=
=AEsource-icmp-type-range=A1=AF should be used here too.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">4. In Section 4.1=
, it requests the IANA to assign a separate port number to the DOTS Signal =
Channel Call Home Protocol. In Section 3.3.1, it says Signal Channel Call H=
ome can use not only this assigned port number
 but also some other port numbers configured by the administrator. So can t=
he Signal Channel Port Number (4646) be configured as the Signal Channel Ca=
ll Home Port Number? The draft should add some normative requirements about=
 this.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">5. In Section 3.3=
.1, it says =A1=AEsource-prefix=A1=AF is an optional attribute, and it also=
 says:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">The =A1=AF=
source-prefix=A1=AF parameter is a mandatory attribute when the<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">attack tra=
ffic information is signaled by a DOTS client in the Call<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">Home scena=
rio.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">5.1. Can the ordi=
nary signal channel use the call home extension? For example, if the signal=
 channel is established by using the Signal Channel Port Number (4646), can=
 the mitigation request contain the source-prefix,
 source-port-range and source-icmp-type-range? (I guess YES, so for ordinar=
y signal channel these parameters are optional)<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">5.2. Can the call=
 home signal channel not use the call home extension? For example, if the s=
ignal channel is established by using the Signal Channel Call Home Port Num=
ber (4647), can the mitigation request not contain
 the source-prefix? (I guess NO, so for call home signal channel the =A1=AF=
source-prefix=A1=AE is mandatory)<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">5.3. Even if the =
ordinary signal channel can use the call home extension, a separate call ho=
me signal channel can also be helpful for the case that home gateway acts a=
s both DOTS client and DOTS server simultaneously.
 Any other reasons to invent the separate call home signal channel?<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">5.4. How to ident=
ify the =A1=AECall Home scenario=A1=AF ? By the signal channel port number?
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">5.5. I prefer to =
make all the above things explicit and clear in the draft.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">6. For this call =
home scenario, the draft doesn=A1=AFt contain anything about data channel, =
is the data channel omitted by mistake? Does the data channel need to exten=
d in the call home scenario? For the case that the
 home gateway acts as both DOTS client and DOTS server simultaneously, will=
 it need two data channels just like it needs the two signal channels?<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">7. In Section 4.2=
, it says:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">This speci=
fication registers the =A1=AFsource-prefix=A1=AF and =A1=AFsource-port-<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">range=A1=
=AF parameters in the IANA &quot;DOTS Signal Channel CBOR Mappings&quot;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:0cm;margin-right:0cm;mar=
gin-bottom:0cm;margin-left:1.0cm;margin-bottom:.0001pt;text-autospace:none"=
>
<span style=3D"font-size:10.0pt;font-family:Courier;color:black">registry e=
stablished by [I-D.ietf-dots-signal-channel].<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">Here mentions =A1=
=AEsource-prefix=A1=AF and =A1=AEsource-port-range=A1=AF, but the =A1=AEsou=
rce-icmp-type-range=A1=AF is missing.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">8. In Section 4.2=
, the IANA registry =A1=B0DOTS Signal Channel CBOR Mappings=A1=B1 can=A1=AF=
t be find in the signal channel draft by searching the quoted name directly=
. (Should be =A1=B0DOTS Signal Channel CBOR Key Values=A1=B1?)<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">9. In Section 4.2=
, the table is better to be given a number and name. In terms of format, th=
is table matches Table 4 of the signal channel draft, and doesn't match any=
 of the IANA registries of the signal channel
 draft.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">10. In Section 4.=
3, the registry name should be =A1=B0DOTS Signal Channel Conflict Cause Cod=
es=A1=B1 (this name is from the signal channel draft).<o:p></o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">11. In Section 4.=
3, is the name =A1=B0request-rejected=A1=B1 good enough? Because comparing =
to the names of other conflict causes, it seems this name can=A1=AFt repres=
ent this specific conflict case, DOTS server can =A1=AEreject the
 request=A1=AF in all the conflict cases.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">12. In NAT consid=
erations of Section 3.3.1, for the case that the NAT translator deployed in=
 the source network, the DOTS client should send the external IP address of=
 the attacker and the DOTS server should find
 the correspondent internal IP address. Comparing to the CGN case, I sugges=
t that some normative words can also be used here.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin:0cm;margin-bottom:.0001pt;text-autos=
pace:none">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif">13. In Section 3.=
1.1, it says =A1=B0</span><span style=3D"font-size:10.0pt;font-family:Couri=
er">the DOTS client MUST validate that attacker prefixes are within the sco=
pe of the DOTS server domain</span><span style=3D"font-family:&quot;Gadugi&=
quot;,sans-serif">=A1=B1.
 But how should the DOTS client know the scope of each DOTS server domain? =
In the call home scenario, there might be tens of thousands of DOTS servers=
, are there some easy methods to let the DOTS client know the scope of each=
 DOTS server domain? In addition,
 I think this is critical for deploying DOTS call home, and we need to addr=
ess this in the draft.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:6.0pt;margin-right:0cm;m=
argin-bottom:6.0pt;margin-left:0cm;mso-margin-top-alt:.5gd;mso-para-margin-=
right:0cm;mso-para-margin-bottom:.5gd;mso-para-margin-left:0cm">
<span style=3D"font-family:&quot;Gadugi&quot;,sans-serif"><o:p>&nbsp;</o:p>=
</span></p>
<p class=3D"MsoNormal" style=3D"margin:0cm;margin-bottom:.0001pt;line-heigh=
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To: "Panwei (William)" <william.panwei@huawei.com>, dots <dots@ietf.org>
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From nobody Wed Jun 26 05:55:21 2019
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Subject: [Dots] I-D Action: draft-ietf-dots-server-discovery-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the DDoS Open Threat Signaling WG of the IETF.

        Title           : Distributed-Denial-of-Service Open Threat Signaling (DOTS) Server Discovery
        Authors         : Mohamed Boucadair
                          Tirumaleswar Reddy
	Filename        : draft-ietf-dots-server-discovery-04.txt
	Pages           : 22
	Date            : 2019-06-26

Abstract:
   It may not be possible for a network to determine the cause for an
   attack, but instead just realize that some resources seem to be under
   attack.  To fill that gap, Distributed-Denial-of-Service Open Threat
   Signaling (DOTS) allows a network to inform a DOTS server that it is
   under a potential attack so that appropriate mitigation actions are
   undertaken.

   This document specifies mechanisms to configure DOTS clients with
   DOTS servers.  The discovery procedure also covers the DOTS Signal
   Channel Call Home.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-dots-server-discovery/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-dots-server-discovery-04
https://datatracker.ietf.org/doc/html/draft-ietf-dots-server-discovery-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-dots-server-discovery-04


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/


From nobody Wed Jun 26 05:56:40 2019
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Thread-Topic: [Dots] I-D Action: draft-ietf-dots-server-discovery-04.txt
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Hi all,=20

The new version addresses the review from Franck.=20

Cheers,
Med

> -----Message d'origine-----
> De=A0: Dots [mailto:dots-bounces@ietf.org] De la part de internet-
> drafts@ietf.org
> Envoy=E9=A0: mercredi 26 juin 2019 14:55
> =C0=A0: i-d-announce@ietf.org
> Cc=A0: dots@ietf.org
> Objet=A0: [Dots] I-D Action: draft-ietf-dots-server-discovery-04.txt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the DDoS Open Threat Signaling WG of the
> IETF.
>=20
>         Title           : Distributed-Denial-of-Service Open Threat
> Signaling (DOTS) Server Discovery
>         Authors         : Mohamed Boucadair
>                           Tirumaleswar Reddy
> 	Filename        : draft-ietf-dots-server-discovery-04.txt
> 	Pages           : 22
> 	Date            : 2019-06-26
>=20
> Abstract:
>    It may not be possible for a network to determine the cause for an
>    attack, but instead just realize that some resources seem to be under
>    attack.  To fill that gap, Distributed-Denial-of-Service Open Threat
>    Signaling (DOTS) allows a network to inform a DOTS server that it is
>    under a potential attack so that appropriate mitigation actions are
>    undertaken.
>=20
>    This document specifies mechanisms to configure DOTS clients with
>    DOTS servers.  The discovery procedure also covers the DOTS Signal
>    Channel Call Home.
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-dots-server-discovery/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-dots-server-discovery-04
> https://datatracker.ietf.org/doc/html/draft-ietf-dots-server-discovery-04
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-dots-server-discovery-04
>=20
>=20
> Please note that it may take a couple of minutes from the time of
> submission
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> Dots mailing list
> Dots@ietf.org
> https://www.ietf.org/mailman/listinfo/dots


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From: "Panwei (William)" <william.panwei@huawei.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>
CC: dots <dots@ietf.org>
Thread-Topic: Some comments on draft-ietf-dots-signal-call-home-02
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--_000_30E95A901DB42F44BA42D69DB20DFA6A69FA69ECnkgeml513mbxchi_--


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From nobody Fri Jun 28 15:21:44 2019
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Date: Fri, 28 Jun 2019 17:21:25 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: Mirja =?iso-8859-1?Q?K=FChlewind?= <ietf@kuehlewind.net>
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Subject: Re: [Dots]  =?iso-8859-1?q?Mirja_K=FChlewind=27s_Discuss_on_draft-iet?= =?iso-8859-1?q?f-dots-signal-channel-31=3A_=28with_DISCUSS_and_COMMENT=29?=
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Hi Mirja,

I wanted to check in with the status of the remaining Discuss points for
this document.  I tried to go through the previous discussions and have
made my own analysis of where things stand, so hopefully we can compare
notes.

On Wed, May 01, 2019 at 07:42:31AM -0700, Mirja Kühlewind via Datatracker wrote:
> 
> 
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
> 
> 1) Port usage (see section 3):
> The port request for DOTS was reviewed by the port expert team. Some members of
> the team were concerned about the assignment of a separate port number for DOTS
> as Coap is used and already has a designated port number. I believe that Coap
> is used as a transport in the case and DOTS provides a separate service
> compared to what Coap is usually used for, however, it is not clear why DOTS
> needs a designated port. Section 3 says that the port can either be
> preconfigured or dynamically detected, therefore it is not clear why a fixed
> port is needed (see also section 7.1. of RFC7605). In the port review process
> the authored argued that a port is needed to differentiate the DOTS service in
> the network. However, this is not an endorsed usage for port numbers (see
> section 6.2. of RFC7605). Further, I believe assigning a fixed port might
> actually add an attack vector for DOTS, either by DDoSing the respective port
> at the DOTS server, or any attempt to block DOTS traffic on the network from
> the DOTS client to the DOTS server.

If I understand correctly you were supporting a port allocation, but wanted
the document to be more clear about its usage and necessity.

There were some text changes, so that we now have:

   In some cases, a DOTS client and server may have mutual agreement to
   use a specific port number, such as by explicit configuration or
   dynamic discovery [I-D.ietf-dots-server-discovery].  Absent such
   mutual agreement, the DOTS signal channel MUST run over port number
   TBD as defined in Section 9.1, for both UDP and TCP.  In order to use
   a distinct port number (as opposed to TBD), DOTS clients and servers
   SHOULD support a configurable parameter to supply the port number to
   use.  The rationale for not using the default port number 5684
   ((D)TLS CoAP) is to allow for differentiated behaviors in
   environments where both a DOTS gateway and an IoT gateway (e.g.,
   Figure 3 of [RFC7452]) are present.

Does that address your concerns?

> 2) Section 4.3 says:
> "In reference to Figure 4, the DOTS client sends two TCP SYNs and two
>    DTLS ClientHello messages at the same time over IPv6 and IPv4."
> However, RFC8305 explicitly states that connection attempts SHOULD NOT be made
> simultaneously (see sec 5).
> 
> Further Figure 4 shows a different order of request as recommended in the text
> (text says: "UDP over IPv6, UDP over IPv4, TCP over IPv6, and finally TCP over
> IPv4"). Also why are the UDP connection attempts repeated? I guess that is
> meant to be the retransmission of the DTLS Hello? However, usually you should
> receive the TCP SYNACK before you retransmit or in the best case even before
> you start the next connection attempt. Therefore that should be not displayed
> like this in the figure or needs further explanation.

We changed this behavior to be sequential and adhere to 8305 most of the
time, but allow dropping the connection attempt delay to 100ms during
(congestive) attacks.

> 3) Why are these statements SHOULDs and not MUSTs (see section 4.4)?
>   "DOTS agents SHOULD follow the data transmission guidelines discussed
>    in Section 3.1.3 of [RFC8085] and control transmission behavior by
>    not sending more than one UDP datagram per round-trip time (RTT) to
>    the peer DOTS agent on average."
> and
>   "If the DOTS client cannot maintain an RTT estimate, it
>    SHOULD NOT send more than one Non-confirmable request every 3
>    seconds"
> as well as in section 4.4.2.1:
>   "If the DOTS server cannot maintain an RTT
>    estimate, it SHOULD NOT send more than one asynchronous notification
>    every 3 seconds"
> and again in section 4.4.2.2:
>  "The frequency of polling the DOTS server to get the
>    mitigation status SHOULD follow the transmission guidelines in
>    Section 3.1.3 of [RFC8085].

These changes made, except for the last one, IIUC.

> However, most of the communication pattern used by DOTS rely on a request/reply
> pattern and Coap specifies for this case that only one request can be
> outstanding at a time (until the reply is received or message is assumed to be
> lost) (see section 4.7 and 4.2 of RFC7252) which therefore will be used in this
> case. Only migration updates are send without reply, and here a MUST would be
> more appropriate.
> 
> Please also note that if there can only be one request outstanding (before a
> reply is received) it is also not possible that requests are received out of
> order (see e.g. 4.4.3: "If UDP is used as transport, CoAP requests may arrive
> out-of-order.").

We did get some pointers to cases in which requests may well arrive out of
order.

> 4) draft-ietf-core-hop-limit is used in section 10:
> "The presence of DOTS gateways may lead to infinite forwarding loops,
>    which is undesirable.  To prevent and detect such loops, this
>    document uses the Hop-Limit Option."
> This sounds like it should be required (and normative language should be used)
> and therefore draft-ietf-core-hop-limit should also be a normative reference.
> Also draft-ietf-core-comi should probably another normative reference.

hop-limit is now normative, and per Alexey's suggestion the comi usage has
been described inline.

> 5)Section 4.5.2: You give recommendations for min and max in a note, however,
> these values should be specified normatively and in best with a MUST.

It got changed to RECOMMENDED.  (I do see you asked why there was a need
for a maximum at all, which I don't remember seeing an answer to.)

> 6) Section 4.7: "the DOTS
>    agent sends a heartbeat over the signal channel to maintain its half
>    of the channel.  The DOTS agent similarly expects a heartbeat from
>    its peer DOTS agent"
> and
> "DOTS servers MAY trigger their heartbeat requests immediately after
>    receiving heartbeat probes from peer DOTS clients."
> Actually heartbeat should only be send in one direction (as the other end will
> send an ack) and the protocol should clearly specify which endpoint is
> responsible for triggering the ping.

I'm not sure I see resolution on this; do the authors still need to
answer why the "pong" reply cannot serve as a reverse-path heartbeat?

> 7) sec 7.3:"To avoid DOTS signal message fragmentation and the subsequent
>    decreased probability of message delivery, DOTS agents MUST ensure
>    that the DTLS record MUST fit within a single datagram."
> This should be handled by the DTLS record layer and not by DOTS that works on
> top of DTLS (actually Coap), therefor it seems straight to have a normative
> requirement here in the DOTS spec. Also note that the calculation provided is
> not valid for early data (0-RTT) as the hello messages could be transmitted in
> the same datagram.

There was some clarifying discussion here; do you still see an issue?

> 8) Also sec 7.3: "If the path
>    MTU is not known to the DOTS server, an IP MTU of 1280 bytes SHOULD
>    be assumed."
>   Actually this is only true for IPv6. The later note mentions that the
>   situation is different from IPV4, however, it should probably be made clear
>   from the beginning that 1280 can only be assumed for IPv6.

Currently we're at a MAY-level limit of 576 bytes when it's known that IPv4
systems are present.

> 9) sec 9.6: What's the registration policy for the newly created registries?

Standards Action, as indicated.

> 10) The document should more explicitly provide more guidance about when a
> client should start a session and what should be done (from the client side) if
> a session is detected as inactive (other than during migration which is
> discussed a bit in 4.7). Is the assumption to have basically permanently an
> active session or connect for migration and configuration requests separately
> at a time?

I think there was some clarifying text added, but please confirm if you
think it is sufficient.

Thanks,

Ben


From nobody Fri Jun 28 16:11:00 2019
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Subject: [Dots] dots - Requested session has been scheduled for IETF 105
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Dear Liang Xia,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    dots Session 1 (2:00 requested)
    Wednesday, 24 July 2019, Morning Session I 1000-1200
    Room Name: Centre Ville size: 200
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/105/sessions/dots.ics

Request Information:


---------------------------------------------------------
Working Group Name: DDoS Open Threat Signaling
Area Name: Security Area
Session Requester: Liang Xia

Number of Sessions: 1
Length of Session(s):  2 Hours
Number of Attendees: 100
Conflicts to Avoid: 
 First Priority: rats ipsecme uta
 Second Priority: tls mls secdispatch i2nsf



People who must be present:
  Valery Smyslov
  Liang Xia
  Benjamin Kaduk

Resources Requested:

Special Requests:
  
---------------------------------------------------------


From nobody Fri Jun 28 21:06:34 2019
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On Fri, Jun 28, 2019 at 05:21:24PM -0500, Benjamin Kaduk wrote:
> Hi Mirja,
> 
> I wanted to check in with the status of the remaining Discuss points for
> this document.  I tried to go through the previous discussions and have
> made my own analysis of where things stand, so hopefully we can compare
> notes.

In addition to Mirja's pending Discuss position, there are some other
points that we should probably update in the document from other IESG
review comments.

I still need to ensure that the dots-signal-reg-review@ietf.org list exists
in time for it to be used for registration requests.

The order of the If-Match: and Content-Format: header fields changed
between the -31 and the -34; is that order important?

Section 4.7 added text:

   If the DOTS server receives traffic from the peer DOTS client (e.g.,
   peer DOTS client initiated heartbeats) but maximum 'missing-hb-
   allowed' threshold is reached, the DOTS server MUST NOT consider the
   DOTS signal channel session disconnected.  The DOTS server MUST keep
   on using the current DOTS signal channel session so that the DOTS
   client can send mitigation requests over the current DOTS signal
   channel session.  In this case, the DOTS server can identify the DOTS
   client is under attack and the inbound link to the DOTS client
   (domain) is saturated.  Furthermore, if the DOTS server does not
   receive a mitigation request from the DOTS client, it implies the
   DOTS client has not detected the attack or, if an attack mitigation
   is in progress, it implies the applied DDoS mitigation actions are
   not yet effective to handle the DDoS attack volume.

Is the server supposed to start mitigation when it identifies that the
client is under attack but the client has not requested mitigation?

RFC 8305 needs to be normative since we use its rules for connection
attempts.

I still think that section 6 (in addition to the current "Note:
implementors must check" text) should specifically call out that the CBOR
and JSON types for enumerateds and the 64-bit quantities can differ in
surprising ways depending on the encoder used, as a potential hazard to use
caution with.

Section 4.4.1 lists a recommended procedure for 'cuid' generation:

         For the reasons discussed in Appendix A, implementations SHOULD
         set 'cuid' to the output of a cryptographic hash algorithm
         whose input is the Distinguished Encoding Rules (DER)-encoded
         Abstract Syntax Notation One (ASN.1) representation of the
         Subject Public Key Info (SPKI) of the DOTS client X.509
         certificate [RFC5280], the DOTS client raw public key
         [RFC7250], or the "Pre-Shared Key (PSK) identity" used by the
         DOTS client in the TLS ClientKeyExchange message.  In this
         version of the specification, the cryptographic hash algorithm
         used is SHA-256 [RFC6234].  The output of the cryptographic
         hash algorithm is truncated to 16 bytes; truncation is done by
         stripping off the final 16 bytes.  The truncated output is
         base64url encoded (Section 5 of [RFC4648]) with the trailing
         "=" removed from the encoding.

In the ballot discussion we heard that all parts of this are just
recommendations (i.e., there is no requirement to base64 or strip padding
or use SHA-256, etc.).  This could perhaps be clarified by changing to:

    For the reasons discussed in Appendix A, implementations SHOULD set 'cuid'
    using the following procedure: first, the Distinguished Encoding Rules
    (DER)-encoded Abstract Syntax Notation One (ASN.1) representation of the
    Subject Public Key Info (SPKI) of the DOTS client X.509 certificate
    [RFC5280], the DOTS client raw public key [RFC7250], or the "Pre-Shared Key
    (PSK) identity" used by the DOTS client in the TLS ClientKeyExchange
    message is input to the SHA-256 [RFC6234] cryptographic hash.  Then,
    the output of the cryptographic hash algorithm is truncated to 16
    bytes; truncation is done by stripping off the final 16 bytes.  The
    truncated output is base64url encoded (Section 5 of [RFC4648]) with the
    trailing "=" removed from the encoding, and the resulting value used as
    the 'cuid'.

which makes very clear that the "SHOULD" applies to the entire procedure,
and not just to the "output of a cryptographic hash algorithm" with the
normativity of the other steps being less well specified.  (This also
inlines the use of SHA-256, since this is the only specification we're
talking about.)

Mirja had a note about the retry-timer and the 45-second addition.  IIUC
the mitgation remains deactivated for the entire retry-timer plus 45
seconds and then is deleted afterwards, but I think Mirja would still like
that behavior clarified in the text.

The ballot discussions indicated that we needed some text about using
Non-Confirmable messages because that overrides behavior in RFC 7641; we
should be more explicit that we are overriding that behavior.

The question of whether the active-but-terminating period is hard-capped at
300 seconds seems to remain unanswered.

In section 4.5 the mention of CoAP ping/pong was removed but no
clarification or pointer to 7252 section 4.2 was added (which was requested
by one of the reviews).

There's also a couple typos left:

s/implictily/implicitly/

s/10 mn/10 min/

Thanks for all the great work getting this document over the finish line!

-Ben


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