On the Server Side

1. Using Netscape's Proxy Server (free of charge to qualifying educational institutions, public libraries, and charitable nonprofit organizations)
   • Two "instances" of the proxy server are created
2. "rotateProxy.pl": Run every night at midnight
   1. Shuts down the oldest server instance
   2. Generates a new random port for the next instance
   3. Rewrites the oldest server instance with the new port and starts it
   4. Creates a new PAC file
3. "selectPAC.pl": A CGI script that determines whether a user needs the on-campus or off-campus PAC file
   1. Detects the browser client's IP address and returns the off-campus or on-campus PAC
   2. Writes a log entry with the user's IP address and campus network ID
4. "expired-proxy.cat-html": Tells the user that their proxy information has expired
   1. Create this line in /etc/services
      expproxy 1080/tcp # Expired Proxy info
   2. Create this line in /etc/inetd.conf and send 'inetd' the HUP signal
      expproxy stream tcp nowait httpusr /bin/cat cat /usr/local/web/proxy/expired-proxy.cat-html