Date: Wed, 22 Dec 1999 17:10:01 -0800 (PST) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/1689: TCP extensions throttles distant connections Message-ID: <199912230110.RAA61554@freefall.freebsd.org>
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The following reply was made to PR kern/1689; it has been noted by GNATS. From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: Jonathan Lemon <jlemon@americantv.com> Cc: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>, Sheldon Hearn <sheldonh@uunet.co.za>, freebsd-gnats-submit@freebsd.org Subject: Re: kern/1689: TCP extensions throttles distant connections Date: Wed, 22 Dec 1999 20:05:10 -0500 (EST) <<On Wed, 22 Dec 1999 17:30:59 -0600, Jonathan Lemon <jlemon@americantv.com> said: > I don't see any abnormal delays in connections between the two > machines. Is there something else I'm missing here, or is the > problem gone in -current? There are two things you're missing (but neither is your fault): 1) Some broken terminal servers (most of which have hopefully been retired) have bad VJ header compression code which trashes TCP segments containing unknown-to-them TCP options. 2) RFC1323 timestamps effectively disable VJ header compression. Arguably, this is not a real-life problem, but for the lack of a dynamic mechanism to control use of RFC 1323 (on a per-destination basis). (1), and not this PR, is the actual reason why RFC 1323 was turned off by default. I'm no longer concerned about it myself and have turned it back on on all of my machines. -GAWollman -- Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same wollman@lcs.mit.edu | O Siem / The fires of freedom Opinions not those of| Dance in the burning flame MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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