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From: jbn@wdl1.UUCP
Newsgroups: net.unix-wizards
Subject: Re: DMC11 help for connecting two LANs
Message-ID: <860@wdl1.UUCP>
Date: Tue, 12-Nov-85 21:26:30 EST
Article-I.D.: wdl1.860
Posted: Tue Nov 12 21:26:30 1985
Date-Received: Fri, 15-Nov-85 04:16:25 EST
Sender: notes@wdl1.UUCP
Organization: Ford Aerospace, Western Development Laboratories
Lines: 31
Nf-ID: #R:rpics:-20900:wdl1:64000030:000:1361
Nf-From: wdl1!jbn    Nov 12 13:35:00 1985


    1.  Both DMCs and DMRs have many problems, but can be made to work.
	Gory details available on request.
	
    2.  Local/long haul networking with mixed fast/slow links doesn't
	work in 4.2 very well; it does work in 4.3.  Problem areas:

	  - DMR driver supplied with 4.2 is a disaster.  Many fixes needed.
	    See Mt. Xinu buglist.

	  - The code needed to specify the address for the other end of the
	    point to point link is missing from 4.2; several people have
	    posted fixes recently.  Incidentally, the Mt. Xinu NFS code
	    breaks this if previously fixed; get the very latest (this week)
	    Mt. Xinu fixes for this if you get support from them and need it.

	  - There are serious congestion problems in 4.2BSD's TCP.  Don't
	    expect much of TELNET when slow links are involved; every key
	    stroke sends 41 bytes down the line.  Worse, the retransmit
	    timer is too short in stock 4.2BSD.  Both bugs are fixed in 4.3.

	  - Network management support is lacking; link errors are not
	    tallied and logged for line trouble evaluation; packets dropped
	    due to overload are not logged, and network loading statistics
	    are not collected in any useful way.

     We still run 4.1BSD with UNET networking ourselves, pending official
release of 4.3 or local generation of enough fixes to make this work well.

					John Nagle