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Article from MacHacking.net Knowledge Base: http://kb.machacking.net

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Title: Proxy Servers Explained
Author: Zelda
Author Contact: zelda@undergroundmac.com
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Proxy Servers Explained
Are computers with a unique service that allows you to connect to a remote computer via that computer therefore complete anon with your connection.

Diagram 1

Your computer --------------> Proxy Server------------>Remote Computer
        (a)		          (b)	                (c)
 (IP=111.111.111.111)      (IP=222.222.222.222)    (IP=211.211.211.211)

For example Your computer (111.111.111.111) sends packets to the proxy server(222.222.222.222:80) then that data is then relayed to the final computer(211.211.211.211) then if data needs to be sent back (211.211.211.211) sends information to (222.222.222.222:80) and that is further relayed to (111.111.111.111) showing complete anonominity.

So theoretically only the connection between B and C will be recorded on CÕs logs and no possible connection between A and C can be found unless a close look at BÕs logs is conducted.

This can be extremely useful from a computer security perspective because of the anon factor.

There are a few different types and versions of proxy servers:

1. SOCKS v4 (My favourite because User/Pass on this version is not enabled by default)

2. SOCKS v5 (Faster and more USER/PASS options)

3. Wingates

4. A previously Hacked computer (preferably with libnet [packet production software] )

Proxy lists can be obtained from the following sites:

www.samair.ru/proxy/fresh-proxy-list.htm
www.proxy4free.com/page1.html

Notes:
1. Proxies normally operate on (by default) port 80 and 8080
2. Information sent and received by a proxy is not encrypted and there is a possibility the server is editing the information as it goes through (possible compromise)

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Article from MacHacking.net Knowledge Base: http://kb.machacking.net