My view is we are updating 2461 to remain DS and not breaking any
architectural components  as that would require and appeal once a spec
is at DS which this one is.  So idea is to update the spec for
clarification, correctness, or extensions.

> Hi,
>   In section 4.2 of RFC 2461 regarding the RA message format 
> the following 
> is mentioned
> 
>      Reserved       A 6-bit unused field.  It MUST be initialized to
>                      zero by the sender and MUST be ignored by the
>                      receiver.
> 
> The mobile-ipv6 draft draft-ietf-mobileip-ipv6-24.txt 
> mandates using the 
> most significant bit of this field as a home agent bit(will 
> be set to 1 if 
> the router is also a MIPv6 HA on this link). I do not know 
> what is the 
> best way to solve this apparent contradiction. I see the following 
> possible solutions (in no particular order)
> 
> * Reduce the reserved field length in RFC2461bis to 5 bits

This is the correct answer IMO.

/jim

> * Change the MUSTs to SHOULDs in RFC2461bis
> * Put a note on RFC2461/RFC2461bis in the rfc-index saying it 
> has been 
> updated by the MIPv6 RFC(when it comes out)
> 
> Regards
> Suresh
> 
> 
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