Date: Wed, 24 Mar 1999 11:14:20 -0800 (PST) From: John Polstra <jdp@polstra.com> To: Archie Cobbs <archie@whistle.com> Cc: hackers@FreeBSD.ORG Subject: Re: Will IPFW pass GRE packets? Message-ID: <XFMail.990324111420.jdp@polstra.com> In-Reply-To: <199903241902.LAA92365@bubba.whistle.com>
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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
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