Re: Broken PMTUD in FreeBSD?

From: Phil Dibowitz (webmaster@ipom.com)
Date: 06/12/02


Date: Tue, 11 Jun 2002 23:48:48 -0700
From: Phil Dibowitz <webmaster@ipom.com>
To: bugtraq@securityfocus.com

I thought I'd update the list:

Mike Silbersack, a FreeBSD developer, had the following to say to me and the
freebsd-net list:
> I did some quick investigation last night, and agree with Phil that this
> is a bug. When the syncache was implemented, only a subset of the normal
> tcp output code was copied over for the purpose of sending syn-acks. One
> part of the code that was not moved over was the part that determines when
> the DF and tos bits are set.
>
> I also agree with Mikael that this isn't an important issue, given that
> syn-ack packets are quite tiny. Nonetheless, I will commit a fix in the
> next few days. However, it's too late to MFC it in time for 4.6-release.

So it will be fixed, and it was a bug. Thanks to everyone who responded, and
thanks to Mike for the quick response.

Phil

-- 
Insanity Palace of Metallica
http://www.ipom.com
webmaster@ipom.com
--