Here's a very weird thing. I have added a WAP11 to my wired home network so that my wife can use her work laptop at home. I set up MAC filtering on the WAP to only allow her machine to access the WAP. (There are also 3 machines wired to the BEFSR41 router, with fixed IP addresses on the LAN side.) Almost immediately after setting up the WAP, the hard wired machines started to get IP address conflict messages. So I went into McAfee's network management and saw that there were machines connecting to my network with all sorts of IP addresses, some matching ours and some not. Some of these machines had names like 'Dining Room' and 'Basement', and were definitely not ours. We live in a neighborhood with lots of wireles networks. So I went into the router's log and watched as someone using IP .104 ('basement' in McAfee) repeatedly hit Google through my router. It gets stranger... as I keep refreshing the router's log, eventually I get a standard browser 'can't display this page' type of message. So I close the browser, reopen it, and attempt to get to the router's page again. Up pops a login window saying that 'the server at 192.168.1.1 at WRT54G requires a username and password.'. I don't have a WRT54G, which I think is a wireless router! (And of course my router's password doesn't work on this mystery router.) So somehow I'm now inadvertently trying to access someone else's wireless router? From a hard-wired machine that happens to be on the same network as a WAP that's set up as Access Point mode only? How is all of this possible? TIA!