The DHCP Server has about 170 active leases. About 20 of the leases have strange mac addresses. For Example: Client IP Address Name Unique ID Lease Expiration Type Description 192.168.100.97 192.168.100.97 3139322e3136382e3130302e393700 3/10/2009 3:02:50 PM DHCP 192.168.100.96 192.168.100.96 3139322e3136382e3130302e393600 3/10/2009 3:02:50 PM DHCP 192.168.100.74 192.168.100.74 3139322e3136382e3130302e373400 3/10/2009 3:02:50 PM DHCP 192.168.100.222 192.168.100.222 3139322e3136382e3130302e32323200 3/10/2009 3:02:50 PM DHCP 192.168.100.198 192.168.100.198 3139322e3136382e3130302e31393800 3/10/2009 3:02:50 PM DHCP 192.168.100.183 192.168.100.183 3139322e3136382e3130302e31383300 3/10/2009 3:02:50 PM DHCP I've determined one of these entries to be an apple airport, configured as a bridge. Is it possible that it is giving some sort of combination of some of the mac addresses that it is bridging through to the dhcp server? Any help is greatly appreciated. Thanks.

If the AP is briding, then the client mac should be the real mac of the node & your DHCP server should see it as such. (As long as I dunno about the extra IP's - I was confused by something like this, turned out a bunch of people had just gotten iPhones & they were the strange DHCP entries I kept seeing.

fmwap: Interesting that you mention iPhones. I have had some activity in the dhcp log from iPhones. But they all had normal looking mac addresses. What do your iPhone mac addresses look like?

I have no idea what those are but they are not mac address. Too many characters. There are a lot of repeated characters. Perhaps its a mac with an addon mac. So you would have the mac of the unit added to the mac of the AP. But I have never seen that in any equipment I have used. A one sentence question will result in a one sentence answer.