Re: default router selection based on network topology

[itojun]

>>      if you pick a wrong router (like one of two downstream router)
>>      as the default and stick to that one, i'm afraid you will see so many
>>      redirects.  if redirect traffic are okay for you, i have no objection
>>      with your plan.
>Even if you have just two routers (and no upstream/downstream issue) you will
>see redirect traffic.  I don't see this as being a problem (one redirect
>per IP destination the host ever sends to isn't a big deal - note that 
>redirect routes don't need to be timed out in IPv6 since NUD protects
>against stale information).

        i'm still having fuzzy feeling about ICMPv6 redirects - if we have
        famous web server in our network, and the web server picked
        wrong (downstream) router as its default router, i'm not sure if
        the amount of ICMPv6 redirects will be acceptable for us.

        another thing - you will want to timeout redirect routes, as they will
        chew your kernel memory space.  you cannot keep them forever.

itojun
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