Add (optional) edns-client-subnet support
Created by: tuf
As a proxy DNS service, it would be useful to have an option to implement the EDNS-client-subnet proposed extension.
This way GSLB and CDNs services could treat the request as if it was actually coming from the requestor.
A dns-lg user could then easily search for differences (like a french IP using a US-based dns-lg would showcase a user experience of CDNs when using OpenDNS and Google Public DNS).