iptables

administration tool for IPv4 packet filtering and NAT

Create a badguy list out of people attempting to connect to port 139 on your firewall and then DROP all future packets from them without considering them.
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iptables -A FORWARD -m recent --name badguy --rcheck --seconds 60 -j DROPCreate a badguy list out of people attempting to connect to port 139 on your firewall and then DROP all future packets from them without considering them.

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