REG: configuring BIND to respond with EDNS client subnet option

Mukund Sivaraman muks at
Tue Mar 29 21:39:53 UTC 2016

Hi Ramachandra

On Tue, Mar 29, 2016 at 02:32:28PM -0700, Ramachandra Kasyap Marmavula wrote:
> Request for some help with configuring a BIND DNS server to respond with
> EDNS0 client subnet option. I am using the enhanced 'dig' utility available
> with the BIND distribution to generate DNS queries with the EDNS0 client
> subnet option. I compiled bind with GeoIP and I am trying to use views to
> to define the list of IP subnets. Sample configuration from named.conf:
> acl "IN" {
> };
> view "EDNS" {
>          match-clients { IN; };
>                 zone "ecs.test" {
>                 type master;
>                 file "/etc/named/zones/myzone.tld.conf";
>         };
> }
> When I send a DNS query with EDNS client subnet option, the server returns
> a response without the ECS option (indicating that it doesn't support this
> option). Is there some other configuration that I have to enable in
> named.conf to get this to work?

Which version of BIND are you using? Authoritative side support for
client-subnet is only available in the master branch (and the 9.11 alpha
release so far). It has not been released in any stable releases and is
not a part of BIND 9.10 or 9.9.

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