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Hi !

I manage a few workstations in a student classroom. We have 24
stations on the lan, and a Linux box that does masquerading with
ipchains under a 2.2 kernel.

Everything runs fine, BUT, from time to time, a student takes the
network cable out of the computer and plugs it into HIS computer. I do
not want to allow this.

How could I forbid such behaviour ? The only thing I see is to
associate an IP with the MAC adress of the computer and to refuse a
packet that is coming from an IP adress that does not match the MAC
adress it should have. Is this possible ? I detect the problems with
arpwatch, but I'd also like to reject such bad traffic. Is it possible
to do this using ipchains rules ? (or with netfilter and a 2.4 kernel
?)

Any ideas ?

Best regards,
Olivier MICHEL

-- 
Olivier MICHEL                       Email : [EMAIL PROTECTED]
Universite d'Evry Val d'Essonne      http  : www.lami.univ-evry.fr/~michel
LaMI - UMR 8042 du CNRS              Phone : +33 (0)1.60.87.39.04
523, place des terrasses de l'agora  Fax   : +33 (0)1.60.87.37.89
91000 Evry - FRANCE

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