Hi all,

Im building a firewall using FW1 and Im seeing icmp type 3 and other
traffic coming into the firewall for IP addresses that are not assigned.
Im sure that the addresses are not being used. Is it possible that someone
is using our class B for an internal network and is incorrectly managing
it through NAT or otherwise? If so how would I go about trying to
determine who it is?

Thanks,

Neil Sobrado
Network Analyst
SUNY New Paltz
Voice (914) 257-3137
FAX   (914) 257-6900

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