Kinda easy...
1. Create a new zone (sub.domain.com) under forward lookup zones that is a standard primary (it must not be in the active directory)
2. Create a new A record (host) under that new zone with the ip you want, but leave the name blank (to use parent domain)
3. tell the server to "Update Server Data File" (should be under the action menu)
4. Navigate your way to the folder C:\WINNT\system32\dns (or equilivent for your system)
5. open the dns file in notepad (sub.domain.com.dns)
6. You should see an entry in there kinda like this:
@ A ###.###.###.### (the ip you chose)
and change the @ to a *
Note: if you want to resolve sub.domain.com and anything.sub.domain.com to ip's, copy that line, paste it on a new line and change that one
7. Save and close the file, go back to the DNS manager, and tell the server to "Reload" (should be under the action menu)
That will do it. You can now manage all of it through the DNS manager, including the * name.
We had to do all this because * is a "invalid character"
B