Forcing all outgoing connections through proxies

How can I do this in Linux? It'd be nice if there was a way to transparently force connections through proxies rather than configure them individually for each program.

Solution 1:

You want proxychains. From the Ubuntu package manager description:

Proxy chains force any tcp connection made by any given tcp client to follow through proxy (or proxy chain). It is a kind of proxifier. It acts like sockscap / premeo / eborder driver ( intercepts TCP calls )

This version supports SOCKS4, SOCKS5 and HTTP CONNECT proxy servers. Different proxy types can be mixed in the same chain.

Features:

• Access Internet from behind restrictive firewall.
• Source IP masquerade.
• SSH tunneling and forwarding.
• Dynamic LAN-to-LAN VPN channel.
• Servers and daemons friendly (works fine with sendmail MTA).