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Re: arpwatch and more

On Fri, Mar 16, 2001 at 09:24:56PM +0100, Marc Haber wrote:
> On Fri, 16 Mar 101 12:28:54 -0500 (EST), Allen Ahoffman
> <ahoffman@announce.com> wrote:
> >can someone tell me how to secure a network so that:
> >the router won't route traffic if the specific mac address isn't
> >registered before hand?
> Kernel 2.4 netfilter can make routing decisions depending on the MAC
> address.
> Please be aware, though, that the MAC address is trivial to forge
> nowadays.
Hmm, how does a switch deal with the same mac address coming from two ports
at the same time?

Does that mean that we've lost the added security from ethernet switches?  I
can see that if a switch was fooled into sending traffic to two ports that
could be a security problem, if security depends on the switching function.


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