4.2bsd gatewaying

[cak at PURDUE.ARPA]

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

The straightforward way to avoid this is to make sure that sdcsla does
not have a route to milnet; then people might send to them, but the
reply packets will not be able to get out. If both ends run routed,
this might be a problem -- I'm not familiar enough with routed to
judge. We axed it a long time ago because it causes more trouble than
it's worth. You might be able to do without running routed on the two
endpoint machines.

chris
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