Setting up a simple firewall/gateway using Linux couldn't be easier. This article on Linux Journal describes how to set up a Linux-based NAT system using only one NIC. Recently, Verizon decided to enforce their "one IP per connection" policy. While this is certainly understandable from a business perspective, it is extremely annoying from this customer's perspective. Since there are currently TWO computers connected to "my" DSL connection, I needed a way to NAT them back onto the Internet again.
Well, this is a major pain in the ass, as anyone who has done it can attest. I tried this …