Strange PTR queries

David W. Hankins David_Hankins at
Thu Mar 12 16:09:08 UTC 2009

On Thu, Mar 12, 2009 at 09:27:27AM +0100, Dima Fadeyev wrote:
> I'm seeing strange PTR-queries from my dhcp machine.

In your dhcpd.conf, check if you have something like;

	get-lease-hostnames true;

This performs a reverse DNS lookup on the lease's IP address to offer
the client as a hostname.

You're getting NXDOMAINs here, so you should also be seeing 'No
hostname for <ip addr>' in dhcpd's syslog output.

David W. Hankins	"If you don't do it right the first time,
Software Engineer		     you'll just have to do it again."
Internet Systems Consortium, Inc.		-- Jack T. Hankins
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