Update Microsoft DNS with dhcpd

Simon Hobson dhcp1 at thehobsons.co.uk
Sat Nov 22 08:24:43 UTC 2008

Michael Webber wrote:

>Is there a way to update a Windows 2003 DNS server with DHCPD?  If 
>so, could someone please send detailed instructions?

Yes you can do it, but you cannot do it securely.

Configure the DNS server to allow unsigned updated from your DHCP 
server - the best you can do here is to allow updated by IP address I 
believe. I "don't do MS Servers" so can't be any more detailed.

Configure your DHCP server to do DNS updates - set ddns-update-style 
to interim.

If your DNS is correctly configured then it will now start doing 
updates ! Yes, seriously, IFF your DNS is correctly configured then 
that is the sum total of what you NEED to do.

Watch the logs and see what's happening. You may well have to tell 
the DHCP server where the DNS server is for each zone, like this :

zone 1.168.192.in-addr.arpa. { primary ; }

If you do, it's because you have not correctly configured DNS 
resolution and/or the zone SOA record. Though you may decide that 
explicitly stating the server to be updated is a good idea anyway.

This is all in 'man dhcpd.conf', but not that you cannot use the 
signed updates security because MS use a different signing method 
which is 'proprietary' (ie designed to make use of third party tools 
more difficult).

Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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