[rbldnsd] filtering udp 53?

[Michael Tokarev]

joe wrote:
> Hello,
> 
> When I start up rbldnsd, it binds to udp port 53, yet nmap says that
> port is filtered, and digging locally doesn't work:

Nmap is a.. strange test for UDP ports.

A DNS server expects queries in certain format.  When you send something
to a DNS server which doesn't look like a valid DNS packet, the only sane
thing for the server to do is to ignore the packet.  So nmap will receive
NO reply.

As of "digging locally" - i've no idea what did you mean by that.
If that means it's "using dig locally and it doesn't work" - please
show an example.

/mjt