[rbldnsd] Forward unresolved queries / refused queries to other dns server

[Michael Orlitzky]

On 05/14/2016 09:12 AM, use experience wrote:
> Team,
> 
> I have set up rbldns. During DIG command, It is working fine for the
> zone file we specify, for there it throws refused error. I would like to
> forward the all unresolved queries or connection refused queries to
> other dns server.
> 

It's usually done the other way around. Instead of configuring rbldnsd
to use another server for "normal" queries, you want to configure your
normal DNS server to use rbldnsd for blacklist queries.

For example, we use unbound as our recursive caching daemon. Unbound
runs on our public IP address, but rbldnsd only listens on 127.0.0.1. We
then forward RBL queries to rbldnsd (in unbound.conf):

  forward-zone:
    name: "jerks.viabit.com"
    forward-addr: 127.0.0.1

  forward-zone:
    name: "uri.jerks.viabit.com"
    forward-addr: 127.0.0.1