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

[Sri Gundavelli <sgundave at cisco.com>]

Hi Charlie,
            I agree with the proposed text.

Thanks !
Sri.

On Fri, 12 Mar 2004, 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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