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From: buck%nrl-css@sri-unix.UUCP
Newsgroups: net.unix-wizards
Subject: Why datagram service is unreliable
Message-ID: <15696@sri-arpa.UUCP>
Date: Wed, 18-Jan-84 10:53:56 EST
Article-I.D.: sri-arpa.15696
Posted: Wed Jan 18 10:53:56 1984
Date-Received: Fri, 20-Jan-84 06:19:40 EST
Lines: 16

From:  Joe Buck <buck@nrl-css>


The design decision that datagram service is unreliable was made
by DOD, in the TCP/IP protocol. This is what 4.2 implements.
Over (say) a local network, the chances of a datagram being
garbled or lost are very slim. The virtual circuit service (TCP)
is implemented by using the datagram service (IP) with sequence
numbers and acknowledgements; there is, of course, a speed penalty for
this.

Berkeley did not design the IPC software, as previous messages
to this list have explained. They merely integrated it into 4.2.

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