On Fri, 24 Aug 2001, Randy Bush wrote:
> > There are two kind of "anycast" proposed and operated for IPv4 - One is
> > RFC1546 [Partridge, 1993] anycast. Another is what we call "BGP anycast"
> > in this document; this is for replicating unicast servers by BGP trick.
> > We concentrate into the former in this document.
>
> as it is used for dns etc. *within* a single provider, it can be an igp
> which is used, not bgp.
Yeah. I think "routing trick" anycast like with IPv4 is a much simpler
approach, and actually _works_ rather well (as there is no constraint the
address must not be used as a source).
6to4 relay, isatap router, shipworm server, ... All of these use the IPv4
anycast mechanism, and will often be more commonplace in IGP rather than
BGP for non-technical reasons (you often don't want to provide service
outside your domain for free).
--
Pekka Savola "Tell me of difficulties surmounted,
Netcore Oy not those you stumble over and fall"
Systems. Networks. Security. -- Robert Jordan: A Crown of Swords
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