Re: TE & SHIM6 (was Re: comments on draft-ietf-shim6-proto-03

[Iljitsch van Beijnum <iljitsch@muada.com>]

On 1-mrt-2006, at 16:12, Iljitsch van Beijnum wrote:

> But an in-band hop-by-hop TE mechanism would allow exactly this.  
> The way it would work is that routers are configured to provide  
> feedback for packets with a shim header, if necessary. This  
> feedback would be in the form of entries that go into the address  
> selection policy table.

In theory, routers could send this feedback for all packets.  
Obviously many hosts aren't going to be multihomed but they could be  
talking to multihomed correspondents so they may have to make TE  
decisions anyway. But limiting this to proto=shim6 packets is  
friendlier on the router's rate limiters and less wasteful. It would  
be even better if we could do this for packets that we know are part  
of a shim-enabled association. Would it be good enough to simply do  
this for all shim packets except I1 (which could be trying to  
initiate shim6 towards a non-shim6 enabled correspondent) or do we  
really want to have a bit in there that tells the router we are open  
to receiving TE info or not?