Packets. Software Firewalls: Made of Straw? Part 2 of 2. By Israel G.
Lugo, Don Parker In ">part one of this article series we looked at how a personal firewall actually works and where it taps into the network stack to do its filtering. In part two we look at how easily the firewall's operation can be circumvented by inserting a malicious Trojan into the network stack itself. Fooling the firewall: LSP Trojan over port 80. Java clickable IP version 4 datagram.