Restricting network access

[CATTANI at COLUMBIA-20.ARPA]

From:  Bob Cattani <CATTANI at COLUMBIA-20.ARPA>

This message is primarily directed to those people who are running
Berkeley 4.2 and are members of the Arpanet community.

There appears to be no provision in Unix to restrict network access.
DCA requires that hosts restrict network access to "authorized" users or
these hosts themselves may be subject to restrictions on Arpa/Milnet
mail bridge traffic.  Is anyone out there doing this?  How?  Restricting
the use of the network user-interface programs (ftp, telnet) would be
quick and dirty but wouldn't keep someone who has his heart set on
talking with the world from creating his own.
-Bob Cattani, Columbia Univ. CS Dept
 (cattani at columbia-20.arpa)
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