topic Re: DNS Utilization in Operating System - HP-UX

DNS Utilization

Michelle Barton — Tue, 15 Jan 2002 22:26:49 GMT

Does anyone know of a way to see what entries in your dns tables are used or not used?

Thanks,
Michelle

Re: DNS Utilization

Scott Van Kalken — Tue, 15 Jan 2002 22:33:02 GMT

On the DNS server you can check the DNS cache to see recently used entries.

This however, is only for things that your server doesn't know about.

If that makes sense.

Scott.

Re: DNS Utilization

Christopher Caldwell — Tue, 15 Jan 2002 23:01:09 GMT

>Does anyone know of a way to see what entries >in your dns tables are used or not used?

I'm not sure what you mean by "entries in your dns tables are used or not used".

If you want to see what's in the DNS cache (and when it expires)
#kill -INT PID_OF_NAMED

Look for the results in
/var/tmp/named_dump.db

If you want to make sure that the name to number mapping still maps to active IPs, I'd write a script to walk through each zone and ping or otherwise excercise a connection to the remote IP.

Re: DNS Utilization

Wilfred Chau_1 — Tue, 15 Jan 2002 23:04:44 GMT

grep for the pid of named.
send a sigill to it.

or
# kill -ill /var/run/named.pid

It will create a statistic file called named.stats for you.

In there, you should see something like

8 Unknown query types
727505810 A queries
17 NS queries
193397 SOA queries
1835712748 PTR queries
5268423 MX queries

Good luck!