What packets to drop when accept mode is false? (was RE: DISCUSS and COMMENT: draft-ietf-vrrp-unified-spec )

Hi Jari, 

Thank you for the comments; I'm breaking and snipping into several
threads for VRRP list for their feedback.

Regards, 
Steve 

> -----Original Message-----
> From: Jari Arkko [mailto:[email protected]] 
> Sent: Thursday, November 06, 2008 08:33
> To: [email protected]
> Cc: Christian Vogt; [email protected]; 
> [email protected]
> Subject: DISCUSS and COMMENT: draft-ietf-vrrp-unified-spec 
> 
> Discuss:
> This is a well written specification, and I'm prepared to 
> ballot Yes on it. However, there were three issues that 
> deserve some discussion and probably small modifications are 
> needed before this can happen. Two of the issues relate to 
> apparently missing information, and one may be either a 
> simple mistake or I misunderstood something.
> 
> I would like to talk about these on the call or with the authors.
> 
> > Accept_Mode  Controls whether a virtual router in Master
> >              state will accept packets addressed to the
> >              address owner's IPvX address as its own if it
> >              is not the IPvX address owner.  Default is
> >              False.
> >
> >              Note: IPv6 Neighbor Solicitations and
> >              Neighbor Advertisements should not be dropped
> >              when Accept_Mode is False.
> >
> >...
> >
> >Compute and join the Solicited-Node multicast address 
> [RFC4291] for the 
> >IPv6 address(es) addresses associated with the Virtual Router.
> 
> Are these the only messages that should not be dropped?! What
> about:
> 
> - RA/RS
> - MLD
> - CPS/CPA (RFC 3971)
> - IGMP
> 
> Is the idea that you actually do stop responding to RA/RS, 
> and that by this hosts should migrate to to use the remaining 
> router natively, rather than the remaining router as a backup 
> for the dead one? If yes, say so.
> 
> MLD is generally sent to multicast addresses, but RFC 3810 Section
> 5.1.15 also talks about a MUST requirement for a router to 
> accept unicasted MLD. How is this accommodated in VRRP?
> 
> What about the SEND certificate retrieval messages CPS/CPA? 
> Lets say the primary router died just when a host had found 
> it, but had not had time to ask for CPS/CPA. What will happen?
> 
[snipped]
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