“In a LAN environment the network administrator doesn’t have to
care about how TCP/IP packets reach their destination. Configuring
the LAN is as simple as defining an IP address, its subnet mask and
maybe a DNS server.”
“Once you have two or more LANs that need to be networked
together, things get already more difficult. For one, you need some
sort of device that routes packets from one LAN to the other
(usually called a router or gateway). You also need to configure
individual computers within each LAN to know the address of the
router.”
“This article will describe the routing process and its
available algorithms. We will also discuss which routing protocols
are available under Linux and how to configure them. That’s a
lot of stuff, so let’s dive right into the subject…”