I am currently living in an apartment with a shared internet connection. All rooms in the building are connected to a switch, which is hooked up to some fiber connection. Now, someone was wise enough to change his MAC and IP address to the default gateway (the route to the modem), which now makes all internet traffic go to this person instead of the modem (I thought there was some kind of protection against malicious arp offers?). The sad part is: I don't have physical access to the switching equipment, so I can't reset them. Is there any way to undo the changes made to the switch's internal mac tables without having access to the switch? Do these internal tables have some sort of TTL fields? If not, is there any other way to access the modem? (I tried associating the FF:FF:FF:FF:FF:FF address with the IP of the default gateway in my arp table, without success)
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You could cut the power for a few seconds if you have access to it - this will reset the internal tables. One thing you could also try is to flood the MAC table of the router - google it and you'll find software that can do this. If the table is flooded the old entries should be flushed out or it starts to behave like a hub - broadcasting all packets to every port |
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