[dns-operations] Anycast vs. unicast NS

Martin Barry marty at supine.com
Fri Mar 18 10:57:10 UTC 2011

$quoted_author = "Shane Kerr" ;
> Having a fewer number of entries in your NS RRSET and making those
> highly anycast should result in a better user experience than having
> more unicast servers. This is because resolvers don't have to go through
> as much pain figuring out the best RTT, as the routing system has
> already done that work.

This is not a given. BGP does not optimise for RTT. It is up to the anycast
operator to have sufficient nodes with dense connectivity to ensure that the
decisions made by BGP roughly equate to RTT.


More information about the dns-operations mailing list