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 Message-ID: <Pine.BSF.3.91.950525114719.12607D-100000@haven.uniserve.com> In-Reply-To: <199505251707.MAA00815@mpp.com>
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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
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