Hi all, With all of your help, I've managed to implement a basic internet firewall on my Cisco router via ACL. I'm logging my denied packets, and I notice the most frequently denied packet is udp on port 137. I thought 137 was part of netbios- why are there so many of these? They appear to have been bound for Macs as well as NTs inside the LAN. About 4-5 an hour for a LAN of 25 computers. Thanks, Dave
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