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Appendix C. Proxy Servers

The server comes with a proxy server called Squid which can proxy the web (HTTP), FTP and Gopher protocols. Proxy servers temporarily store

information from the Internet on the hard drive of the server, allowing other users to access it directly from that hard drive. For example, when an

employee visits a web page, the web proxy server will store that web page. Subsequent visitors to that web page will read it from your proxy server’s

hard drive, rather than over the Internet. This slightly reduces the network performance for the ﬁrst visitor to that web page, but can enhance the

performance for subsequent visitors.

Many gateway systems require the use of proxy servers, but with the server it is optional. Networked applications such as web browsers will work

perfectly without proxying, due to the IP masquerading capability of the server.

In general, we recommend that proxying be disabled in your network applications. Using the proxy server can beneﬁt the organization if you have a

slow Internet connection and you’ve installed your server software on a fast computer. In this case, reading from the hard drive will be faster than

reading from the Internet. Remember, though, that a proxy server beneﬁts the second and subsequent visitors to a site but not the ﬁrst visitor, so this

beneﬁt only applies if your users tend to visit the same sites repeatedly.

A proxy server is generally not appropriate if you have a fast Internet connection and you’ve installed your server software on a lower- or mid-level

computer. In this case, reading from the hard drive of the computer may not be faster than over the Internet. It also offers no beneﬁt to your

organization if employees at your site do not tend to visit the same web pages.

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Mitel SME Server V5 with ServiceLink Guida Utente Pagina 90

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