Subject: AW: [mobile-ip] Re: FW: I-D ACTION:draft-tsirtsis-dsmip-problem-00.txt

From: "Fritsche Wolfgang" <[email-masked]>
Date: Wed, 30 Jul 2003 15:57:28 +0200

George,

> -----Ursprüngliche Nachricht-----
> Von: Tsirtsis George [mailto:[email-masked]] 
> Gesendet: Mittwoch, 30. Juli 2003 10:48
> An: 'Alain Durand'
> Cc: Mobile-Ip ([email-masked]); 
> [email-masked]; Soliman Hesham; 'Thomas Narten'
> Betreff: RE: [mobile-ip] Re: FW: I-D 
> ACTION:draft-tsirtsis-dsmip-problem-00.txt
> 
> 
> Alain,
> 
> For mobility a node needs a stable address i.e. the Home 
> Address (HoA). All communications are directed to that HoA 
> and a Home Agent (HA) intercepts and forwards to the node's 
> care-of-address (CoA).
> 
> Now how the Mobile node comes to own a given HoA is not so 
> important from this perspective. It could be native v6 or it 
> could be 6to4...I do not think it matters as long as there is 
> an HA that can intercept packets sent to that HoA and forward 
> them to the CoA.
> 
> Now, when the mobile is  not at home but in some other 
> network, there is an issue about what kind of v4/v6 support 
> there is in the foreign network. The nice thing about Mobile 
> IP is that it is based on tunnels and thus it provides 
> natural way of tunneling over networks that are not 
> compatible with the mobile ...if only Mobile IP could 
> configure v4 over v6 and v6 over v4 tunnels (as opposed to 
> just v4 over v4 and v6 over v6 tunnels). A dual stack mobile 
> in a v4 only foreign network would then be able to create a 
> v4&v6 over v4 (forward and reverse) tunnel with its HA and 
> thus maintain all its connectivity.

As MIPv6 will use IPsec in tunnel mode between MN and HA, I assume a MIPv6 MN in a v4 only foreign network will set up a "v6 over v6 over v4" bi-directional tunnel to its HA (with the first v6 being the outer header of the IPsec packet based on the CoA, and the second v6 being the inner header based on the HoA), not just a v6 over v4 one.

Wolfgang

> 
> George
> 
> -----Original Message-----
> From: Alain Durand [mailto:[email-masked]] 
> Sent: Wednesday, July 30, 2003 12:23 AM
> To: Tsirtsis George
> Cc: Mobile-Ip ([email-masked]); 
> [email-masked]; Soliman
> Hesham; 'Thomas Narten'
> Subject: [mobile-ip] Re: FW: I-D 
> ACTION:draft-tsirtsis-dsmip-problem-00.txt
> 
> 
> Hi George,
> 
> Thank you for writing this draft, this is an interesting 
> perspective. There is one point you do not mention: what if 
> the IPv6 node is using directly or indirectly IPv6 in IPv4 
> tunnels for its IPv6 connectivity? For example, it may derive 
> a 6to4 prefix from its home address and then uses MIPv4.... 
> There are extra complexities here that I'm not sure I fully 
> understand. Is it a problem space that you intend to cover?
> 
> 	- Alain.
> 
> On Tuesday, July 29, 2003, at 12:17  PM, Tsirtsis George wrote:
> 
> > Hi all,
> >
> > During the Mobile IP WG meeting in Austria, Hesham and 
> myself brought 
> > up the issue of mobility management for dual stack nodes.
> >
> > Thomas N. requested that we put together a problem 
> statement so that 
> > we can discuss the issue; the draft below was published 
> today - it is 
> > short and I
> > hope to the point - so do read it :)
> >
> > I have copied v6ops since I think this is a v4 - v6 
> migration issue as 
> > well as Mobile IPv4 and Mobile IPv6 issue.
> >
> > Let us know what you think.
> >
> > George
> >
> >
> >
> > -----Original Message-----
> > From: [email-masked] [mailto:[email-masked]]
> > Sent: Tuesday, July 29, 2003 5:15 PM
> > Subject: I-D ACTION:draft-tsirtsis-dsmip-problem-00.txt
> >
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts
> > directories.
> >
> >
> > 	Title		: Mobility management for Dual stack 
> mobile nodes  A
> >
> >                           Problem Statement
> > 	Author(s)	: G. Tsirtsis, H. Soliman
> > 	Filename	: draft-tsirtsis-dsmip-problem-00.txt
> > 	Pages		: 4
> > 	Date		: 2003-7-29
> > 	
> > This draft discusses the issues associated with mobility management
> > for dual stack mobile nodes. Currently, two mobility management 
> > protocols are defined for IPv4 and IPv6. Deploying both in a dual 
> > stack mobile node introduces a number of inefficiencies. Deployment 
> > and operational issues motivate the use of a single mobility 
> > management protocol. This draft discusses such motivations. 
> The draft 
> > also hints on how current MIPv4 and MIPv6 could be extended so that 
> > they can support mobility management for a dual stack node.
> >
> > A URL for this Internet-Draft is:
> > 
> http://www.ietf.org/internet-drafts/draft-tsirtsis-dsmip-problem-00.tx
> > t
> >
> > To remove yourself from the IETF Announcement list, send a 
> message to
> > ietf-announce-request with the word unsubscribe in the body of the 
> > message.
> >
> > Internet-Drafts are also available by anonymous FTP. Login with the 
> > username "anonymous" and a password of your e-mail address. After 
> > logging in, type
> > "cd internet-drafts" and then
> > 	"get draft-tsirtsis-dsmip-problem-00.txt".
> >
> > A list of Internet-Drafts directories can be found in
> > http://www.ietf.org/shadow.html or 
> > ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> >
> >
> > Internet-Drafts can also be obtained by e-mail.
> >
> > Send a message to:
> > 	[email-masked].
> > In the body type:
> > 	"FILE /internet-drafts/draft-tsirtsis-dsmip-problem-00.txt".
> > 	
> > NOTE:	The mail server at ietf.org can return the document in
> > 	MIME-encoded form by using the "mpack" utility.  To use this
> > 	feature, insert the command "ENCODING mime" before the "FILE"
> > 	command.  To decode the response(s), you will need "munpack" or
> > 	a MIME-compliant mail reader.  Different MIME-compliant 
> mail readers
> > 	exhibit different behavior, especially when dealing with
> > 	"multipart" MIME messages (i.e. documents which have been split
> > 	up into multiple messages), so check your local documentation on
> > 	how to manipulate these messages.
> > 		
> > 		
> > Below is the data which will enable a MIME compliant mail reader
> > implementation to automatically retrieve the ASCII version of the 
> > Internet-Draft.
> >
> >
> > Date: Tue Jul 29, 2003  9:40:01  AM US/Pacific
> > To:
> > Subject:
> >
> >
> >
> > <ATT19898.txt>
> >
>