Linux IP Masquerade HOWTO
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# 2.3. Who Can Benefit From IP Masquerade?

- If you have a Linux host connected to the Internet and..

- if you have internal computers running TCP/IP connected that are connected to this Linux box via on a network, and/or

- if your Linux host has more than one modem and acts as a PPP or SLIP server connected to other computers, and these machines do not have official or public assigned IP addresses (i.e. addressed with private TCP/IP numbers).

- If you want those OTHER machines to communicate to the Internet without spending extra money to acquire additional Public / Official TCP/IP addresses from your ISP, then you should either configure Linux to be a router or purchase an external router.

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