25
Sep
Using ARP Poisoning to Create an Ad-Hoc Firewall – Part 1: The Strategy
Some time ago I wrote a small C++ wrapper library around libnet and libpcap to ease the development of various networking applications. After spending some time trying to come up with an idea, I figured I would try and create a very simple ad-hoc firewall by utilizing ARP poisoning (this will be explained shortly) on hosts I wanted to firewall. I know very little about firewalls, so I thought it would be a cool project. Furthermore, it is also a legitimate use of ARP poisoning which is certainly not something you come across every day. In this post I will explain the basic idea behind ARP poisoning and how I intend to use it to create an ad-hoc firewall.
