Re: default router selection based on network topology

[Erik Nordmark]

>       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.

I don't have any data to say how much it will be in such a case.
The worst case is clearly something that exchanges exactly one packet
with every IPv6 address on the planet where you'll see one redirect
per sent IP packet. A web server typically sends a lot more than
one IP packet per destination. But as I said I don't have any hard data
here.

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

Our implementation keeps them around until the kernel gets low on
memory.

  Erik

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