Fwd: [address-policy-wg] 2007-02 New Policy Proposal (Change in IP Assignments for Anycasting DNS Policy)

Hi,

On Tue, May 15, 2007 at 01:45:53PM +0200, Sascha Lenz wrote:
> I'd like to see some real-life ideas about WHY an entity wants to use 
> DNS anycast here, too.

Well, for the original proposal, the reasoning was about this:

 - entity wants to deploy a LARGE number of nameservers for a given zone

 - the way DNS works limits the amount of NS records that can be
   returned by the parent - if more nameservers are to be deployed,
   they must "share an NS record" (sort of) -> anycast.

 - ("the DNS WG says that anycast is a useful approach", and they are the
   DNS experts, so it's not us to argue this statement)

 - added benefits are indeed "bring servers closer to the clients"
   (improve latency) and "DDoS spread" (DDoS usually hits not all
   of the instances, so lots of users are not affected at all)

the last argument is hard to bring into a policy (because it's hard
for the NCC to evaluate) - the first argument is a hard technical fact,
and as such, can be measured, counted, and used for a decision.

Gert Doering
        -- NetMaster
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