If you have a local subnet (one or more local machines), but have been allocated only a single IP number from your Internet provider (or even if you receive a dynamic IP number), you may want to look at the natd(8) program. natd(8) allows you to connect an entire subnet to the Internet using only a single IP number.
The ppp(8) program has similar functionality built in via the -nat switch. The alias library ( libalias(3)) is used in both cases.
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