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Originally Posted by mopsie
That may or may not be true but with Airsnare indicating a strange MAC and WEB activity, I'm inclined to believe that there is an intruder. Not that I'm outraged or particularly worried about the bandwidth (unless he/she is watching streamed movies) - I'm more worried about the security of my network, but the principle of illegally abusing someone elses property still remains.This has only started to occur in the last few days and I have changed nothing on my setup - same PCs, same software, same hardware. I have changed my WEP and restarted with just my laptop and 1 wireless card - activity stopped for a couple of hours and then restarted, so I assume the WEP has been cracked.  And I've just discovered from my ISP activity log that access started to occur at 3am this morning - I know where I was then and it wasn't anything to do with computers!! 
Any suggestions what to do next??..... |
That does look suspicious
How much data did you transfer over the connection in the time span between changing the WEP key and the resumption of suspect activity?
As Audit pointed out an intruder would need to capture a few Gb of data before cracking the key - I don't think that's normal in the space of a couple of hours with the typical residential network.
Leave AirSnare running overnight with your AP disconnected and see if AirSnare detects anything.