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I found the following here (Javascript required):

Opting out of DNS Assistance by changing your DNS settings in Macintosh OS X 10.3 and 10.4

There are two procedures that you must complete in order to opt out of DNS Assistance:


Find and record your current DNS server settings.
Statically Assign your DNS Settings.
Follow the detailed steps below to complete each procedure.

Note: Setting the DNS server settings to static will opt out all computers including those connected through a wireless connection.

Find and record your current DNS server settings
Double click the Macintosh HD icon on your computer desktop.
Double click the Applications folder.
Double click the Utilities folder.
Double click the Terminal/Terminal.app icon.
Type cat /etc/resolv.conf at the command prompt in the terminal window. Make sure you enter a space between cat and /etc.
Record the numbers located in the nameserver fields. These numbers represent your current DNS server settings.
Close the terminal window.

Statically Assign your DNS Settings
Click the Apple icon, and then select System Preferences.
Click the Network icon.
Select the active adapter from the list, and then then click Configure.
Note: Active adapters have a green dot next to the adapter.
Select the TCP/IP tab in the Network screen.
Enter the DNS server addresses you previously recorded into the DNS Servers section.
Replace the last octet of your DNS server addresses with .14.
For example, if your existing DNS address is 123.123.123.12, replace the .12 at the end of the address with .14. The new address for this example would be 123.123.123.14.
Click Apply Now to save your changes.

Make sure that your Mac's firewall is turned on, connect your Mac directly to your DSL box via Ethernet, then see what DNServers you see.

Make sure that you adjust the DNServer settings for your AirPort settings rather than for your Ethernet settings once you get it all reconnected again.

D'Eyncourt wrote:

Make sure that your Mac's firewall is turned on, connect your Mac directly to your DSL box via Ethernet, then see what DNServers you see.

Make sure that you adjust the DNServer settings for your AirPort settings rather than for your Ethernet settings once you get it all reconnected again.

That worked.

D'Eyncourt wrote:

dvpierce wrote:

You're making this way too complicated.

http://www.geocities.com/dvpierce/aputil.PNG

See the text field next to the DNS servers? If you type the IP of the DNS server you want to use, it will override the one that configures automatically.

If it's this easy on Windows, I'd imagine it would be a piece of cake on the Mac, right?

Getting the Mac to use the IPs wasn't the problem; finding the IPs in the first place was the problem.

It shows them to the right of the text fields.

You can actually put things in those boxes dvpierce pointed out, to change the DNS server address for all computers on that network.

The easiest ones to remember are 4.2.2.1 through 4.2.2.6 (and possibly 4.2.2.7, but I can't remember), and the Airport Utility looks basically the same on OS X and Windows.