From owner-freebsd-hackers Wed Mar 24 11:14:42 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from wall.polstra.com (rtrwan160.accessone.com [206.213.115.74]) by hub.freebsd.org (Postfix) with ESMTP id 899A614F03 for ; Wed, 24 Mar 1999 11:14:40 -0800 (PST) (envelope-from jdp@polstra.com) Received: from vashon.polstra.com (vashon.polstra.com [206.213.73.13]) by wall.polstra.com (8.9.1/8.9.1) with ESMTP id LAA28957; Wed, 24 Mar 1999 11:14:21 -0800 (PST) (envelope-from jdp@polstra.com) Received: (from jdp@localhost) by vashon.polstra.com (8.9.2/8.9.1) id LAA00740; Wed, 24 Mar 1999 11:14:20 -0800 (PST) (envelope-from jdp@polstra.com) Message-ID: X-Mailer: XFMail 1.3 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <199903241902.LAA92365@bubba.whistle.com> Date: Wed, 24 Mar 1999 11:14:20 -0800 (PST) Organization: Polstra & Co., Inc. From: John Polstra To: Archie Cobbs Subject: Re: Will IPFW pass GRE packets? Cc: hackers@FreeBSD.ORG Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Archie Cobbs wrote: > Basically I agree with you, but it's agreement "in practice" > rather than "in theory". In other words, Microsoft (and Ascend, > 3Com, Copper Mountain, and ECI) may have done something that was > just plain stupid, but they didn't do anything that was a blatant > violation of any spec. Yep, I think we're in violent agreement. :-) I think what bugs me is that Microsoft didn't just leave the checksum as optional. They actually specified that it's not to be used. :-( > Moreover, while not perfect, IP error rates are still much lower > than 1990-era modem error rates were, etc. So they were probably > just lucky enough to get by on this one... BTW, there's an interesting little table on page 147 of Stevens Vol. 1 ("TCP/IP Illustrated") showing some actual measured error rates from around 1992. John --- John Polstra jdp@polstra.com John D. Polstra & Co., Inc. Seattle, Washington USA "Self-interest is the aphrodisiac of belief." -- James V. DeLong To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message