You can filtered your Linux Box (the router one) filetering with IPTables (kernel 2.4 or 2.6) or IPchains (kernel 2.2). You must filtered your ethernet card (the one which have the public address and then route your "clean" connection to your private ethernet (the private ethernet card). I know, I am already doing that. But I need to shape traffic (assign priorities for different ports, limit bandwidth, balance bandwidth, etc...). This I'm trying to do with tc, but it doesn't seem to work. iptables work fine, I'm with RH9.
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