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Essay on Building a Linux Router
Routers are amongst the most crucial components of the Internet, as each bit of information on the Internet passes through many routers. Most of the routers used on the Internet are made by Cisco. Although these have good performance, they come at a high price. In situations where we need to economize, the Linux router is an attractive alternative. When used as a simple gateway for a LAN, it can be almost free. All that is needed is an old 486DX machine with more than one network interface. A monitor is not always necessary. If used for a sophisticated application you will need a Pentium PI 200MHz MMX, which is costs more but is still three or four times cheaper than a commercial router with comparable functionality. If one has a small lab with several LANs and wishes to set up a reliable, as well as secure, connection to the Internet, the cost of a commercial router may not be justifiable. The most economical solution in this case is to use a low-cost processor running the LRP (Linux Router Project distribution, which is a networking-centric, micro-distribution of Linux. (Christopher Negus, February 2005)
In this report I shall try to explain how to set up a Linux router for two to four LANs and test its performance under different conditions. All of the work described here was done on Intel PIIIs running at 733MHz. For comparison we also used Pentium Is and IIs. Here we present the results of our investigation into the performance of the Linux router and compare it with a commercial router. The most common function of the Linux router is a connection between two networks. Typically, this would be a LAN and the Internet. For our experiments, given the unavailability of a connection to the Internet fast enough to stress the router sufficiently, we used a server to simulate the Internet....
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