Re: On the use of multiple PA prefixes or a single PI prefix for IPv6 multihoming

Cedric de Launois wrote:
> Le ven 22/10/2004 à 17:01, Michael H. Lambert a écrit :
> 
>>Given that the "best path" probably just has meaning for a given 
>>application between given hosts at a given point in time, how often do 
>>we *really* need the *best* path?
> 
> 
> The goal is not much to have the *best* path, but to avoid really bad
> paths.
> 
> 
>>Best effort usually works well enough for forwarding--why shouldn't it 
>>do the same for path selection? (I think Noel implied this in his 
>>response--to use his highway analogy: in driving from Boston to San 
>>Francisco saving six hours is good, saving ten minutes is (usually) 
>>irrelevant?)
>>
>>Since the One True Best Path is likely unknowable anyway, why 
>>complicate path selection by building SVCs (or MPLS tunnels) into it?
> 
> 
> In the multi-address multi6 case, path selection is simply done by
> selecting the right source and destination prefixes. If a host can
> figure out which are the couples (src,dst) prefixes to avoid, then the
> benefit can be huge. This doesn't require tunnels in any ways.

Well, there remains the exit router selection issue - I think one
of the proposed solutions to that did in fact require a (short)
tunnel.

    Brian