services on subnet-router anycast address?

Ignatios Souvatzis ignatios at
Thu Apr 26 14:00:48 CEST 2012


On Thu, Apr 26, 2012 at 12:39:12PM +0200, Gert Doering wrote:
> On Thu, Apr 26, 2012 at 10:25:15AM +0200, Ignatios Souvatzis wrote:
> > Those are possibly trickier. They might end up on different hosts-
> > e.g. if some fallback mechanism is involved. The same considerations
> > apply as above, but you have to look closer whether paths to multiple
> > instances of the specific address can coexist.
> All this is assuming that there is indeed anycasting involved, instead
> of just "the webserver having a cool and easy-to-remember IPv6 address".
> You can't see that from outside the network in question - and I'd put my
> $5 into the "it's just a webserver, no anycast involved, and quite 
> likely the address is bound as a /128 to its loopback, so there is not
> even a subnet involved where this could be the router-anycast address".

Of course. What I tried to embed in my sermon above was: It's the
responsibility of the server's and the subnet's administrators to 
consider whether there would be any problem; the (possibly remote)
client can't decide.


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