Each machine contains two Ethernet cards, and runs both sendmail and Squid. Telnet and FTP requests are handled by the standard Linux telnet and FTP daemons. The outer of the two machines will accept only mail delivery requests from the outside world, thus providing protection against unwanted connections. It will accept FTP and telnet connections from the inner firewall machine, allowing remote maintenance of the machine. It will also handle web requests via its own copy of squid, thus providing web access.
Mail is handled in a similar waterfall fashion.
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