From owner-freebsd-hackers  Thu May 25 11:33:01 1995
Return-Path: hackers-owner
Received: (from majordom@localhost)
          by freefall.cdrom.com (8.6.10/8.6.6) id LAA05965
          for hackers-outgoing; Thu, 25 May 1995 11:33:01 -0700
Received: from haven.uniserve.com (haven.uniserve.com [198.53.215.121])
          by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id LAA05945
          for <hackers@FreeBSD.org>; Thu, 25 May 1995 11:32:56 -0700
Received: by haven.uniserve.com id <135>; Thu, 25 May 1995 11:48:59 -0700
Date: 	Thu, 25 May 1995 11:48:52 -0700 (PDT)
From: Tom Samplonius <tom@uniserve.com>
To: Mike Pritchard <pritc003@maroon.tc.umn.edu>
cc: hackers@FreeBSD.org
Subject: Re: Speeding up your slip link
In-Reply-To: <199505251707.MAA00815@mpp.com>
Message-ID: <Pine.BSF.3.91.950525114719.12607D-100000@haven.uniserve.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: hackers-owner@FreeBSD.org
Precedence: bulk


On Thu, 25 May 1995, Mike Pritchard wrote:

> Just in case anyone is interested, one way I found to squeeze a 
> few more bytes through your SLIP link is to set "tcp_extensions=NO" 
> in your /etc/sysconfig file.  This disables the RFC1323 & RFC1644 
> extensions, which are really intended for high speed links.
> In fact, RFC1323 even suggests disabling it on slow links.
> 
> If you don't normally connect to other hosts that support RFC1323
> and RFC1644 then you won't see any difference.  To determine if
> a host you are connecting to supports RFC1323, try examining 
> some traffic to/from that machine with "tcpdump".  If it indicates
> that the "timestamp" option was present, then it is sending
> the extra RFC1323 data.

  I saw some traffic about this on the NetBSD.  Apparently, their SLIP 
code automaticaly stips this info if VJ header compression is used.  This 
also affects PPP too.

tom