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From: jim@baroque.stanford.edu (James Helman)
Newsgroups: comp.sys.sun
Subject: CSLIP + Telebits + SunOS (was Re: Telebit T1000 vs T1500 (Summa
Keywords: Networks
Message-ID: <1990Aug15.234937.6393@rice.edu>
Date: 14 Aug 90 21:12:06 GMT
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X-Sun-Spots-Digest: Volume 9, Issue 293, message 12

pbiron@weber.ucsd.edu (Paul Biron) writes: 

      I got one reply from someone at Telebit, who explained
      at little bit about PEP itself, and specifically about
      Telebit's and SLIP.  The jist of his message was that
      Telebit's don't handle SLIP very well -- it causes
      thrashing between small and large packets

      Telebit (or someone they've
      donated a mass of TB's to) is working on ways to
      improve their performance on SLIP 

This is probably Van Jacobson's CSLIP (SLIP + header compression), the
beta version of which has been available for more than half a year (from
ftp.ee.lbl.gov).  I believe the header compression is supposed to make
single character TCP/IP packets much smaller, hopefully small enough to
fit into one of Telebit's micro-short packets, rather than requiring a
largely unused 256 byte long packet.

I have CSLIP running on our Sun-3's (SunOS 4.0.3 w/Rayan
Zachariassen's driver for streams).  Now, I'm looking for modems.

Questions:

1) Does anyone have any experience running the beta CSLIP on Telebits?  If
so, how well does it work (throughput and interactivity) and with what
models, settings, etc? 

2) Will SLIP's successor, PPP, have different modem requirements?

3) Does CSLIP beta work with SunOS 4.1?

4) The System V streams stuff in SunOS 4.0 slowed down the serial
ports considerably.  How much CPU horsepower does it take to service a
port around 9600 or 19.2K?  Is SunOS 4.1 any better?

Thanks,

Jim Helman
Department of Applied Physics			Durand 012
Stanford University				FAX: (415) 725-3377
(jim@KAOS.stanford.edu) 			Voice: (415) 723-9127