Date: Mon, 1 Dec 2003 17:27:01 -0800 From: "Crist J. Clark" <cristjc@comcast.net> To: Kenneth W Cochran <kwc@TheWorld.com> Cc: freebsd-stable@freebsd.org Subject: Re: ecn info Message-ID: <20031202012701.GA77254@blossom.cjclark.org> In-Reply-To: <200312010518.AAA8752973@shell.TheWorld.com> References: <200312010518.AAA8752973@shell.TheWorld.com>
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On Mon, Dec 01, 2003 at 12:18:02AM -0500, Kenneth W Cochran wrote:
> Where might I find information on how FreeBSD handles
> ECN (explicit congestion notification)?
> I've been searching the mailing list archives & so far
> can't find anything.
AFAIK, there isn't much to find. There is some code for
housekeeping of the ECT and CE bits in the DIFSERV field, but what may
be most telling is,
$ cd /usr/src/sys
$ fgrep -r TH_ECE net*
netinet/tcp.h:#define TH_ECE 0x40
netinet/tcp.h:#define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR)
The CWR flag gets the same result. They are not actually used
anywhere.
--
Crist J. Clark | cjclark@alum.mit.edu
| cjclark@jhu.edu
http://people.freebsd.org/~cjc/ | cjc@freebsd.org
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