Re: [Mip4] Re: [Issue 44] RFC 3344 - Source Address of the RRQ

[Kent Leung <kleung at cisco.com>]

Hi Charlie.  Sorry for being late in this thread.

Should we be more specific here?  As you said, the FA may
offer multiple CoA's.  The MN chooses the CoA in the RRQ.
It's important to RFC 3519 that this source IP address is
consistent with the CoA in the RRQ.

Possible text:

    Copied from the Care-of Address field within the Registration
    Request.

This might be a bit more detail and accurate to support?

Kent

At 03:52 PM 3/12/2004 -0800, Charles E. Perkins wrote:

> Hello Sri,
>
> This is regarding the new Issue 44.  It seems that we both
> tried to insert this issue at about the same time, so that
> your text appears twice.  Or else, I don't understand just
> how the darned issue tracker works...
>
> Anyway. here is the text revision I propose to
> resolve this issue:
>
> Old text:
>     The foreign agent's address on the interface from which
>     the message will be sent.
>
> New text:
>     The care-of address offered by the foreign agent for
>     the mobile node sending the Registration Request.
>
> I believe it's possible for the foreign agent to offer
> a multiplicity of care-of addresses, and I tried to
> arrange it so that this text does not preclude that
> possibility.
>
> Regards,
> Charlie P.
>
>
>
>
> ext Sri Gundavelli wrote:
> >
> > RFC 3344:
> > Section 3.7.2.2. Forwarding a Valid Request to the Home Agent
> >
> > "Specific fields within the IP header and the UDP header of the
> >    relayed Registration Request MUST be set as follows:
> >       IP Source Address
> >                The foreign agent's address on the interface from which
> >                the message will be sent."
> >
> > Per the above the text, the foreign agent is required to send the RRQ
> > with the source address of the outgoing interface and this essentially
> > conflicts with RFC 3519 (NAT Traversal) requirement. Per 3519, the
> > foreign agent is required to set the source address of the RRQ to its
> > care-of address, so that the home agent does not detect NAT incorrectly.
> > The logic of NAT detection at the home agent is by comparing the source
> > address of the RRQ to the care-of address in the RRQ's MIP header. So,
> > we need to fix the text in 3344. There is no reason why the foreign agent
> > MUST set the source address of the RRQ to the IP address of its outgoing
> > interface. We should infact enforce the foreign agent to set the source
> > address of the RRQ to the FA care of address.
> >
> > Sri/
>
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