Proxychains

Proxychains

This is open source software for GNU/Linux systems.

proxychains - a tool that forces any TCP connection made by any given application
to follow through proxy like TOR or any other SOCKS4, SOCKS5 or HTTP(S) proxy.
Supported auth-types: "user/pass" for SOCKS4/5, "basic" for HTTP.

proxyresolv - DNS resolving. Used to resolve host names via proxy or TOR.

When to use it ? What for ? Why ?

When you want two (or more) different proxies in chain:
like: your_host <--> proxy 1 (TOR) <--> proxy 2 (HTTP or SOCKS4/5) <--> target_host

You may need it when the only way out from your LAN is through proxy server.
Or to get out from behind restrictive firewall that filters some ports in outgoing traffic.
And you want to do that with some app like telnet.
Indeed you can even access your home LAN from outside via reverse proxy if you set it.
Use external DNS from behind any proxy/firewall.
Use TOR network with SSH and friends.

For Further Reading,
http://proxychains.sourceforge.net/howto.html

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