Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm primarily in a OSX environment and I'm seeing a large number of NXDOMAIN responses from our internal DNS servers. The queries that trigger these responses are what I believe to be mDNS/Bonjour style addresses that look like the following:

Each host gets around 4000 NXDOMAIN responses a day for. I don't believe this is normal for OSX machines, at least I hope not. Also, our internal DNS servers recursively request answers from these addresses to the root name servers which can't answer them.

Does anyone know how I can stop the workstations from sending these requests and/or how to tell my internal name servers (BIND 9) to not "forward" these requests to the internet? We use Bonjour internally for easy printer configuration and screen sharing.

EDIT: the requests that make it to the internet are only PTR (reverse) queries.

Thanks Jon

share|improve this question
up vote 1 down vote accepted
  1. Your DNS server shouldn't be forwarding queries for if is your internal DNS zone. It's authoritative for and the buck stops there.

  2. As for forwarding the PTR queries, set up a rDNS zone for, and, which will stop your server from forwarding those queries for the same reason as in #1.

As for how to stop the clients from making those queries, I'm afraid that disabling Bonjour is probably the only way.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.