[Pdns-users] Modifying DNS Response

[Klaus Darilion]

On 18.09.2015 12:47, Önem Özgülgen wrote:
> Hello,
> 
> As i wish to send original queries to the closest server and respond to
> them, if there's something can be done reliable and affordable "before"
> an Anycast BGP Routing, it'll be really cool!
> 
> Yes, i'd like to get more detailed information about it please!

You could just use several unicast IP adresses for the authoritative
name servers. The DNS resolvers usually measure the round trip times to
them and then choose the fastest for the following queries.

With Anycast it works from the beginning, but is not always correct (BGP
is optimized for cheapest routing, not for most efficient routing). Any
if it is to expensive for you to build an Anycast network, just host
your domains with some anycast provider. There are several with IMO
reasonable prizes.

regards
Klaus