Re: (sipp) Loopback & SST

Steve Deering <deering@parc.xerox.com> Thu, 21 July 1994 04:13 UTC

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To: William Allen Simpson <bill.simpson@um.cc.umich.edu>
Cc: sipp@sunroof.eng.sun.com
Subject: Re: (sipp) Loopback & SST
In-Reply-To: bill.simpson's message of Wed, 20 Jul 94 08:09:25 -0800. <2888.bill.simpson@um.cc.umich.edu>
Date: Wed, 20 Jul 1994 20:05:00 -0700
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From: Steve Deering <deering@parc.xerox.com>
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> > The loopback address may be used a source address, whereas a multicast
> > adress may not.
> 
> I'm not sure this is a good argument against it.  When is the loopback
> ever used as a source address?

Whenever it is also used as a destination address.

For an isolated machine that has no network interfaces, the loopback
address is its *only* unicast address.  IP or SIPP is still useful
in that scenario, to allow network-capable clients talk to co-resident
servers without needing special-case code to deal with intra-machine
communication.

Steve

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