From owner-freebsd-hackers  Thu May  8 13:17:01 1997
Return-Path: <owner-hackers>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id NAA16892
          for hackers-outgoing; Thu, 8 May 1997 13:17:01 -0700 (PDT)
Received: from phaeton.artisoft.com (phaeton.Artisoft.COM [198.17.250.50])
          by hub.freebsd.org (8.8.5/8.8.5) with SMTP id NAA16887
          for <freebsd-hackers@FreeBSD.ORG>; Thu, 8 May 1997 13:16:59 -0700 (PDT)
Received: (from terry@localhost) by phaeton.artisoft.com (8.6.11/8.6.9) id NAA25434; Thu, 8 May 1997 13:12:08 -0700
From: Terry Lambert <terry@lambert.org>
Message-Id: <199705082012.NAA25434@phaeton.artisoft.com>
Subject: Re: FTP Performance
To: danny@panda.hilink.com.au (Daniel O'Callaghan)
Date: Thu, 8 May 1997 13:12:08 -0700 (MST)
Cc: smc@servtech.com, freebsd-hackers@FreeBSD.ORG
In-Reply-To: <Pine.BSF.3.91.970508103844.4479D-100000@panda.hilink.com.au> from "Daniel O'Callaghan" at May 8, 97 10:42:42 am
X-Mailer: ELM [version 2.4 PL24]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-hackers@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

> Ahah!  Are they using Annex routers?  If they are using an old version of 
> the software, they are probably not working with TCP extensions 
> properly.  Try
> 
> # sysctl -w net.inet.tcp.rfc1644=0
> # sysctl -w net.inet.tcp.rfc1323=0
> 
> If that works, turn off tcp extensions in /etc/sysconfig | /etc/rc.conf
> 
> Alternatively, try reducing the MTU and MRU of ppp's tun interface to 552 
> or 1064.  That cured Robert Chalmers' problem with his ISP's Ascend routers.

Alternately, upgrade the routers to a version of TCP/IP that is not
in violation of the option negotiation setction of the TCP/IP RFC.


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.