4.2 networking: pup & other non-IP protocols

[CFrankston at MIT-MULTICS.ARPA]

From:   Charles Frankston <CFrankston at MIT-MULTICS.ARPA>

MIT's Chaos protocol has been brought up under 4.2.  It is NOT
integrated into the Berkeley socket mechanism.  It can be used with
either Interlan or DEUNA Ethernet drivers, MIT Chaos net boards (rather
rare), and probably DEQNA drivers by now.  The Interlan and DEUNA
drivers require you to configure your machine at least with a Internet
address since it uses the Berkeley IP driver for those devices.  This is
so machines running both IP and Chaos need only one Ethernet interface.

Available services are comparable to TCP/IP -- Telnet (based on Arpanet
new telnet protocol), Supdup, File Transfer, remote finger etc.

There is probably no real reason why a site that didn't already have an
MIT type Chaos net in place (there are perhaps 10 serious such sites
besides MIT) would want to use this in preference to TCP/IP.