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A gateway server is a server through which the computers in a LAN access the Internet. This is
usually done through NAT. It should also provide firewall protection for the LAN and it can also serve
as a DNS and DHCPD server for the LAN. Some years ago I have been involved in a project for building gateway servers like this, using
slackware on old PCs. In this article I will try to explain the things that I have done on this project and
how I did them.