setting up lax security on one ethernet interface while leaving the other strict



I have an ubuntu (7.04) box with two ethernet interfaces.

I would like to leave one of them secure, but make the other one very
insecure --- maybe even allow telnet over it. (The insecure one is
to be networked to one old computer for which i can't get a recent
version of ssh.)

Can this be done through the gui?

Or is there some single configuration file i can change to make it
happen?

Thanks in advance for any info.

dan
.



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