DHCP server does not update DNS

Simon Hobson dhcp1 at thehobsons.co.uk
Wed Dec 21 19:24:23 UTC 2011

Richard Allen wrote:

>... and we also located the network issue witch turned out to be a rogue
>dhcp relay

I keep a piece of "clue by four" in the office. I've come close to 
using it once or twice ;-)

>Dec 21 16:02:24 wanda dhcpd: DHCPRELEASE of from
>00:0f:fe:80:50:3e (censored5) via eth0 (found)
>Dec 21 16:02:54 wanda dhcpd: DHCPDISCOVER from 00:0f:fe:80:50:3e via
>Dec 21 16:02:55 wanda dhcpd: DHCPOFFER on to
>00:0f:fe:80:50:3e (censored5) via
>Dec 21 16:02:55 wanda dhcpd: DHCPREQUEST for (
>from 00:0f:fe:80:50:3e (censored5) via
>Dec 21 16:02:55 wanda dhcpd: DHCPACK on to 00:0f:fe:80:50:3e
>(censored5) via
>Dec 21 16:02:57 wanda named[31310]: client update
>'censored.com/IN' denied
>Now is the proper relay agent it should be using when
>traversing broadcast domains.
>There was however no attempt made to register this into DNS.

I think you are now down to sniffing packets to see what options 
are/aren't present. That looks normal for a situation where client 
and server have agreed that the client will update DNS.

Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
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