Let’s say you bind a Mac to AD. Let’s say you have two NICs in there. Now let’s say you get entries for both NICs in DNS. How do you fix that? Well, go ahead and create an ipfw rule to block traffic on port 54 for the second NIC. You aren’t using it for that anyway if you’re using Xsan, which seems to be the big place we’re seeing this issue… File a bug report if you don’t like the ipfw workaround but don’t hold your breath… UPDATE: Apple actually posted a fix for this: To set Mac OS X Server version 10.5 to only register a single network…