How to enable EDNS for an authoritative name server?

[Evan Hunt]

On Thu, Jan 22, 2015 at 03:25:38PM +0800, Jackie Lui wrote:
> I have installed bind 9.10.1 and enable GeoIP features. This works fine
> except the EDNS feature.
> 
> When I dig Google DNS server with +subnet parameter, Google DNS server can
> respond the CLIENT-SUBNET value. However, when I dig my DNS server, it
> can't show the CLIENT-SUBNET value. It seems that my server cannot
> handle ECS query?

BIND 9.10 only has support for the client-subnet option in dig, not in
the name server.

Authoritative server support for client-subnet will be in BIND 9.11.
You can try it now by cloning the git repository at source.isc.org, if
you like (I'd be happy to have your feedback on it).

-- 
Evan Hunt -- each at isc.org
Internet Systems Consortium, Inc.