Subject: Re: [sunset4] CGN document for consideration

From: "George, Wes" <[email-masked]>
Date: Fri, 27 Jul 2012 17:05:47 -0400

Reinaldo -

A comment about this draft:
In section 3.2, you mention immediate purge of mapping when a TCP RST is received. While it's not a unique issue to this recommendation, I think there's a security consideration around this - an attacker could cause a lot of state-mapping churn on the CGN (in addition to the obvious impact to the customer session itself) by sending random TCP RSTs to ports on the external IP address block of the CGN. Therefore it may not be advisable to recommend this behavior without some sort of rate-limiting or a discussion of ways to distinguish legitimate TCP RSTs that do legitimately occur from maliciously initiated RSTs.

Thanks,

Wes George, speaking as an individual

> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]] On
> Behalf Of Reinaldo Penno
> Sent: Tuesday, May 01, 2012 6:01 PM
> To: [email-masked]
> Subject: [sunset4] CGN document for consideration
>
> Hi,
>
> I would like to submit this document to the WG for consideration.
>
> http://tools.ietf.org/html/draft-penno-behave-rfc4787-5382-5508-bis-02
>
> I'm assuming that port allocation method drafts should be submitted to
> this WG.
>
> Thanks,
>
> Reinaldo
>
>
> _______________________________________________
> sunset4 mailing list
> [email-masked]
> https://www.ietf.org/mailman/listinfo/sunset4

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