We switched from a cisco router to using a gentoo box with mutiple nics - all appears to be working very well. However, i ran into a major problem when one of my PC's went nuts. It flooded the network with "unknown protocol" which I saw from tcpdump.

Basically, I am trying to find a way to protect the internal network from bad network devices. This did happen when under the cisco setup but it did not bring the network down. I'm assuming we need a little bandwidth control (TC) implementation but is there any tricks in the kernel/network setup which will help as well.

Any pointers will greatly help!

Vernon
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