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To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Cc: bmah@FreeBSD.ORG,
	=?iso-8859-1?q?Gavin=20Kenny?= <gavinkenny@yahoo.co.uk>,
	net@FreeBSD.ORG
Subject: Re: TCP Flavour 
In-Reply-To: <200110171743.f9HHhpR55404@khavrinen.lcs.mit.edu> 
References: <20011017131755.12965.qmail@web20005.mail.yahoo.com> <200110171659.f9HGxNs04904@c527597-a.cstvl1.sfba.home.com> <200110171743.f9HHhpR55404@khavrinen.lcs.mit.edu>
Comments: In-reply-to Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
   message dated "Wed, 17 Oct 2001 13:43:51 -0400."
From: bmah@FreeBSD.ORG (Bruce A. Mah)
Reply-To: bmah@FreeBSD.ORG
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If memory serves me right, Garrett Wollman wrote:
> <<On Wed, 17 Oct 2001 09:59:23 -0700, "Bruce A. Mah" <bmah@FreeBSD.ORG> said:
> 
> > If memory serves me right, =?iso-8859-1?q?Gavin=20Kenny?= wrote:
> 
> >> What flavour of TCP is standard in the FreeBSD stack,
> >> is it Reno or New Reno, Vegas, Tahoe any others?
> 
> > You didn't say what version of FreeBSD you were concerned with, but 
> > 4.3-RELEASE and later versions all use NewReno.
> 
> Well, um, yes and no.  FreeBSD includes the ``NewReno'' algorithm, but
> it is probably not appropriate to characterize FreeBSD's TCP stack in
> that way.  I would say that FreeBSD implementes the FreeBSD flavor of
> TCP, which is a unique blend of ideas from many outside efforts, and
> is based originally on the 4.4BSD stack.

OK, that's a fair characterization.  There's more to TCP than the
congestion control and retransmission algorithms...other things such as
initial sequence number generation (RFC 1948 or some variant thereof),
timestamps (RFC 1323), etc.

Bruce.



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