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Old 10-25-2003, 03:25 PM   #1
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How do I dynamically register RH9 in W2K DNS

I am running RH9 on my laptop and would like to have it dynamically register in DNS. The issue is that my DNS machine is running Windows 2000 Server SP 3. Anyone have any idea how to get this to work?

Old 10-30-2003, 10:27 AM   #2
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I have a similar qustion except using RH8, so...bump.

I have done a bit of research on the subject have have a few thoughts. Aparently the WIN2K DNS Server is RFC 2136 (Dynamic DNS) in theory you should be able to set up your dhclient.conf file with the proper FQDN and key data and have it register, correct? The only problem is, if you only allow secure dynamic updates on you MS-DNS server, how do you set up the keys in order for it to securely authenticate.

Has anyone actually gotten this to work or found another way?


EDIT: Found this info on the ms site:
Windows 2000 supports both dynamic update, defined in RFC 2136, and secure dynamic update, defined in the IETF Internet-Draft "GSS Algorithm for TSIG (GSS-TSIG)."

Last edited by d.hawk; 10-30-2003 at 10:45 AM.
Old 10-31-2003, 01:53 PM   #3
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To answer part of my own question:

There are several ways in which you can accomplish dynamic DNS updates from a linux box to a Win2K DNS Server. The Win2K DNS Server is in fact RFC 2136 compliant, and uses TSIG keys for secure updates. TSIG keys require a "shared secret" to be known by both computers in order to generate and decode they keys. Windows uses Kerberos to distribute these secrets, and in what way im not quite sure yet (more to come on that later).
I did sucessfully get an A Host record inserted into an Active Directory Integrated Zone on a Win2K Adv. Server. Here are the steps I followed.

1.) On the properties of the Forward Lookup Zone that you want to update, goto Properties->General and make sure "Allow Dynamic Updates" is set to YES. This is a slight security hazard, considering a hacker could spoof an IP address and then register/modify/delete entries in this Zone.

2.) From your linux machine, draw a Dynamic IP address and make sure the DNS Server it got is the one you want to update to, then run the nsupdate command in the console.

>update add <your hostname> A <your IP address>

*note: you need to have that blank line in there before you quit, its what sends the command to the DNS server.

Now check your DNS server...there should be an A record in the Forward Lookup Zone of your domain.

This way of course is not acceptable since you dont want to have to run this command every time your draw an IP. You can also edit your dhclient.conf file and have the DHCP server authenticate for you. For more on that config, see this page.

Another Reference I found usefull.

If I figure out the Kerberos thing...I'll post more


Last edited by d.hawk; 10-31-2003 at 01:58 PM.


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