[expert] Proxy/router setup How-To

[george . jones]

Just want to know of a good resource on setting up a proxy server/router
using linux. What I want to do is have 1 machine for my proxy that also
provides my internet connection to 3 other boxes. The 3 machines also need
to be able to transfer data between themselves. The box I want to use is a
P133Mhz machine w/32Mb, 4 NIC's (1 in/3 out), and Mandrake 7.0