Routing is normally done on a PC with two or more network adapters. This article presents a configuration using a pair of Ethernet adapters. More specifically, the article examines how a Linux computer can link a local network to the Internet through an Ethernet-attached device like a cable modem or a DSL modem.
Individual sections address each concept.
The last section combines the basics into a sample configuration for linking a local network to the Internet. Routing 101 Routing can be done using a number of network protocols but the IP protocol is the one that is addressed in this article. IP is also the protocol used on the Internet. The previous articles address configuration of the IP protocol for network adapters on a Linux computer. Linux can implement very complex routing using multiple network adapters, but most configurations utilize a pair of network adapters.