[dnsop] DNS Anycast revisited (fwd)

Wed May 4 13:52:16 UTC 2005

TF> Date: Wed, 4 May 2005 10:48:56 +0100
TF> From: Tony Finch

TF> Why would anyone use an anycast address as a client? Wouldn't it be
TF> simpler to make all client connections from the machine's unicast address?

Maybe, maybe not.

Take an anycast DNS provider that AXFR/IXFRs zones from its customers.
Notifying them of all anycast addresses and keeping ACLs up-to-date
isn't feasible.

The obvious answer is to have a couple hosts pull zones from unicasted
addresses.  However, this creates a few small targets... the question is
if DNS slaves would benefit sufficiently from increased splay to warrant
the additional implementation complexity.

Eddy
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