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Web proxies

You may wish to configure your Web browser to use a proxy. Using a proxy provides a small increase in privacy, because your real IP address will not appear in server logs, but many other bits of identifying information, such as cookies and user-agent strings (which give your browser and OS version) are still passed through. Here at CSAIL, the principal value of the proxy for most users is the ability to access online resources that are restricted to MIT IP addresses. Many such resources still haven't updated their systems to recognize that CSAIL has its own IP address space; because the proxy has a MITnet ("net 18") address, it is able to access these resources on your behalf. In addition, the proxies act as caches, storing recently-accessed Web content closer to you, which may help when accessing some slow Web sites. (It can only do this if the originating server permits it to do so; dynamic content like webmail or bulletin boards will not see any benefit.) In addition to the proxy that TIG maintains, there is also the ronweb proxy run by the NMS group as part of their Resilient Overlay Networks project.

These proxies are accessible only from CSAIL networks. If you need to access these resources from off-campus, you can use the VPN client or (for some sites) the MIT Libraries' certificate-authenticated proxy.

Configuration instructions for Firefox

From the menu bar, go to Edit => Preferences. On the left-hand side, select "General" (if it isn't already selected). Click on the "Connection Settings" button; this will pop up another window with your proxy configuration. Select the radio button labeled "Manual proxy configuration", and check the box "Use the same proxy for all protocols". For "HTTP Proxy", enter and port 3128. Under "No Proxy for", enter (there's no sense in using the proxy for hosts that are closer to you than the proxy is). Then click "OK" to save your settings.

Configuration instructions for Internet Explorer

From the menu bar, go to Tools => Internet Options. Select the "Connections" tab at the top. Click on the "LAN Settings..." button; this will pop up another window with your proxy configuration. Check the box "Use a proxy server for your LAN"; enter for "Address" and 3128 for "Port". Also check the box "Bypass proxy server for local addresses". Then click "OK" to save your settings.

Configuration instructions for Safari


Configuration instructions for Opera


Technical information about the TIG proxy

The TIG proxy runs on a Dell PowerEdge server donated by Intel. It has 212 GiB of disk cache, and 1 GiB of memory. For software, it runs the Squid Internet Object Cache, version 2.5.9 on Debian Sarge.

-- NoahMeyerhans - 29 Mar 2005
-- GarrettWollman - 14 Jun 2005
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Topic revision: 29 Nov 2006, JasonDorfman

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