On Wed, Jan 26, 2005 at 03:54:42PM +0100, Zafer Aydogan wrote:
> Hello Mailing List,
> 
> Just an Idea.
> I thought about using anycast (zebra/quagga) for determinig the closest
> netbsd www server worldwide, where all servers have the same ip adress
> (multiple with same ip) and routing is done to the closest one.
> 
> Maybe in the Future, when the demand is huge :)

My understanding of anycast, from testing it on a "metanetwork" composed
of tunnels between private networks and running a mixture of Quagga and
Zebra for routing[1], is that it's only good for stateless protocols.
Basically, anything that uses TCP (like HTTP traffic) generally won't be
a good candidate for anycast because there is no guarantee that packets
belong to the connection will all arrive at the same server.

Anycast *is* great for handing UDP-based services like DNS and Kerberos.
In many ways it's a more robust way to handling slave KDCs -- less
client-side configuration (assuming that kadmin to a particular master
KDC isn't an issue in your environment).

-T


1. http://www.seekingfire.com/projects/metanetwork/


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