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TIHE Encyclopedia

How does the TIHE network work? - by Chris Fleizach

The TIHE network, as of October 2004, is made of 110 computers spread across 5 classrooms, an office and the DECC (distance education communications center). The classrooms have Ethernet plugs in the walls to connect each computer station. Inside the walls, there are ethernet cables that connect to a switch in each room. The switch in the conference room is connected to the switch in Lab 2 by another ethernet cable. Similarly, Lab2 is connected to Lab1. The office area also has a cable connecting into the switch in Lab 1. From Lab 1 there is a cable connecting to a switch in the server room. Lab 3 is connected to Lab 4 and Lab 4 is connected to the switch in the server room.

All the computers are part of the Windows domain (tihe.org) and get their IP address settings from the Windows Server (tihe1 - DHCP (which gives out IP settings), DNS (domain name service), User Authentication and File sharing (with a mirrored drive) all run on the Windows Server 2003 (tihe1). There's a backup Windows Server 2003 (tihe2 that mirrors the functionality of tihe1.

There's a Linux Server, tihe0, (, running as well that provides a proxy (a program to control how client computers use the Internet), file sharing, email and webserver.

There's a leased line from TCC that connects to the broadband modem TCC gave to us that connects us to the Internet. The modem is plugged into the firewall (, which is also plugged into the switch in the server room. The firewall is configured only to allow access from the LAN to the Internet if the IP address is below If it's above 100, that means it got the IP address from the DHCP and that it must go through the proxy in order to access the Internet. The firewall only allows in email (port 25) and webserver (port 80) traffic. All other data is discarded.
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