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Chaning the password on the router won't work. You don't have to be in charge of the LAN, even on a wired network you can sniff like this by tricking the other computers into thinking that your computer is the router (this can be detected if you know what to look for, though). On a wireless network, it can done pretty much undetected unless it's using WPA or WEP with EAP and RADIUS (which gives each user a diffrent key).
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