Maintained by: NLnet Labs

[Unbound-users] Does/can unbound use RTT values to prioritise DNS?servers

Nick B
Sun Nov 28 16:31:59 CET 2010

On 28 November 2010 11:16, Alexander Clouter <alex at> wrote:
>> Does or can unbound be configured to prioritise recursive queries
>> using the lowest RTT values, maybe from the Infra cache? In this
>> instance 'K' is preferable to 'M' for example.
> Question is, especially for the root nameservers, is it worth it?  There
> are only ~300 TLD's[1] and once you have looked up .com, you should
> technically not be querying the root name servers for .com for another
> 48 hours.

You're right, the root nameservers are probably a bad example but each
of those TLD's will have a number of namerservers around the world. If
unbound could be configured to prioritise those nameservers that are
closer (in terms of latency) rather than using some form of
round-robin then any uncached queries would surely benefit from a
improved response time?