Restricting network access

[cak at Purdue.ARPA]

From:  Christopher A Kent <cak at Purdue.ARPA>

The way we have attacked it here is that all "unauthorized" users are on
machines that do not have network routing entries that allow them to
connect to the Arpanet. This is quick and easy, and requires no
patching of any code. Unfortunately, it requires you to have enough
machines to do the segregation.

chris
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