Here's a copy of an email I just sent to Linksys. I thought maybe someone from this forum may be able to explain it (or even confirm if they have heard of it). ************ I notice something weird when scanning my wireless network traffic. It seems whenever I power the WRV200 on, there are two ESSID's associated to the router MAC, one is my own SSID and the other is "Harrison". Harrison always has a client MAC of 00:04:20:06:40:c0 associated with it (again, Harrison seems to be a second router ESSID that uses the exact same MAC as my own). The client MAC prefix 00:04:20* is registered to SlimDevices Inc (which makes the Squeezebox Media Centre). I know for sure that this is related to the router as when I power down, both my own and the Harrison ESSID go away, power up and they come back. I am using WPA2 and have changed the PSK several times and the associated client to Harrison always authenticates with my WRV200 MAC. Further, I have MAC filtering disabled and the 00:04:20 address is definitely not on my list. Very weird, I'm downloading your source code to have a look at it and see if it sheds some light. Are you able to explain this???