[dns-operations] edns-client-subnet capable authorities?

Peter van Dijk peter.van.dijk at powerdns.com
Sat Jul 22 00:07:20 UTC 2017


On 20 Jul 2017, at 2:00, Mark Andrews wrote:

> In making a decision about whether to probe or white list you may want
> to look at https://ednscomp.isc.org/compliance/summary.html which has
> graphs of the failure modes for unknown EDNS options.
> Timeout and echos are both bad for ECS.  Echos increase the cache
> size for no benefit.

Echos would have SCOPE PREFIX-LENGTH set to zero (because that is 
mandated in queries), and resolvers can either detect this, or if they 
don’t, they would cache as 0/0. Neither bloat the cache.

Kind regards,
Peter van Dijk
PowerDNS.COM BV - https://www.powerdns.com/

More information about the dns-operations mailing list