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Stone Zhong photo
Stone Zhong's TCP/IP Packet Filter v1.3 a.k.a Ipfilter
Ipfilter is a tiny Ip-filter, that can be used as a personal firewall, a port-blocker or like any other Router with an Ip-filter.
Filters TCP, UDP & ICMP

Easy to Setup and use, takes some easy filtering rules as input and just starts filtering.

Endorsement : CougarSecurity uses Ipfilter internally in our production environment

Official IPfilter page
 
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