>My problem is that, Machine A (equipped with a modem) can dial out
>and go to the outside world, it can also ping Machine B (no modem
>installed). However, machine B can only ping machine A, but never
>go to the outside world.
Have you followed all the tests in the new IP-MASQ-HOWTO?
http://www.ecst.csuchico.edu/~dranch/LINUX/ipmasq/ipmasq-HOWTO-1.71-5.html
--David
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