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<< what is netbios... za just detected someone trying to connect via netbios or something. >>
r u in a dorm? someone in ur lan is prolly trying to connect with u. >>
Windows computers on a network always have a computer name, the NetBIOS (Network Basic Input/Output System) name. To be able to connect to other computers on the local network easily they will send a query to other computers on the local subnet, either to set up a Master Browser list, or to connect to one. This is done by means of a 'broadcast', a packet send to ALL computers on the local subnet. Most providers filter out these packets (so you don't get all packets from other users, nor that they can connect to your computer using the NetBIOS stuff), but if yours doesn't, or you are in a dorm or something you will receive those packets.
It doesn't immediately mean someone is trying to attack you, just keep your eye open for multiple packets from that user, and if he sends different ones too. NetBIOS may send one or more packets, but it only sends a few, and doesn't keep on sending them. If you see a constant stream of them, go beat someone up.