Re: [MEXT] Removing bindings for IPv4 only - please comment

[<Christian.Kaas-Petersen at tieto.com>]

Fine with the addition.  The original suggestion of Karen, now
described in draft-premec-mext-extended-home-link, is something
different, namely maintaining both IPv4 and IPv6 home addresses
on a home link which gives native support for either IPv4 or IPv6.
Suppose the home link supports only IPv4.  The home agent will
remove the entry for the v4HoA address, retaining the entry
for the v6HoA, and this entry will indicate packets for v6HoA
will have to be IP-in-IP tunneled to v4HoA.   

Christian

> -----Original Message-----
> From: mext-bounces at ietf.org [mailto:mext-bounces at ietf.org] On 
> Behalf Of Hesham Soliman
> Sent: 12. december 2008 07:28
> To: mext at ietf.org
> Cc: Jari Arkko; Julien Laganier
> Subject: [MEXT] Removing bindings for IPv4 only - please comment
> 
> Hi all, 
> 
> Gerardo requested that we consider the issue of removing an 
> IPv4-only bindings in the spec. We discussed this with the 
> chairs and it seemed like a simple add-on to the spec. I'm 
> still wondering if this is the same thing that Karen asked 
> for earlier and we decided to do it separately. If it is, 
> then I don't understand why we didn't consider the following 
> solution (can't remember if I suggested it before).
> 
> I've added the following text to the draft, please let me 
> know if you have any comments ASAP. I want to submit this 
> version on the weekend if possible.
> All the IESG comments have been included. It's pretty 
> straight forward and follows standard MIPv6 logic.
> 
> <section title="Removing Bindings">
>                    
> <t>Mobile nodes will remove bindings from the home agent's 
> binding cache whenever they move to the home link, or simply 
> when mobility support is not needed.</t>
> 
> <t>De-registering the IPv6 home address is described in <xref 
> target="RFC3775"/>. The same mechanism applies in this 
> specification. Mobile nodes may remove the binding for the 
> IPv4 home address only, by sending a binding update that does 
> not include the IPv4 home address option. Upon receiving this 
> binding update, the home agent will replace the existing 
> cache entries with the content of the new message. This 
> ensures that the
> IPv4 home address binding is removed, while maintining an 
> IPv6 binding.</t>
> 
> <t>Note that the mobile node cannot remove the IPv6 home 
> address binding while maintaining an IPv4 home address binding.</t>
>                    
> <t>A binding update message with a lifetime of zero, will 
> remove all bindings for the mobile node.</t> </section>
> 
> Hesham
> 
> 
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