Hi All, I have a rather odd problem with my AirPort Extreme, and I simply cannot fathom what's causing it. I have an odd network setup (because I like configurability, but the AirPort Extreme is good for wireless): I have a regular router, with it's wifi disabled, and an AEBS, in bridge mode, wired into my router providing wireless. All works perfectly. Everything on my network has a static IP address. No static IP address = no connection (there is no reserve pool). It just makes it everything easier to manage remotely when I know the IP address of every computer and device). My network, briefly, is: router: 10.0.0.1 server: 10.0.0.2 AEBS: 10.0.0.3 MacBook in question: 10.0.0.19 I've been getting a message coming up at random on my MacBook saying "Another device is using your IP Address 10.0.0.19" - which, in theory, is impossible - there are no other devices with that address assigned. When this happens, I also get this in the log: 06/03/2013 22:29:54.000 kernel: nd6_na_input: duplicate IP6 address fe80:0004::1610:9fff:fed6:3135 IPv6 is disabled on my network - I have no need for it. When this happens, I checked what was connected to my router - and indeed, something was connected with ip address 10.0.0.19 - and the MAC address of the device using it was that of my AirPort Extreme's 5GHz Wi-Fi card! So my AEBS has essentially stolen my laptop's static IP address (the AEBS is statically assigned 10.0.0.3, so shouldn't change from this). This isn't simply because it's connected through the Wi-Fi card - it lists the Mac of the device not the Wi-Fi bridge, and I can point AirPort Utility to 10.0.0.19 and it will load up my AirPort Extreme Configuration. I've checked every possible configuration option on both routers, and I cannot physically see anything that's causing it - does anyone have any suggestions? I have literally run out of ideas with this one! Thanks!