From owner-freebsd-questions@FreeBSD.ORG  Fri Jan 28 21:36:14 2005
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 75EA116A4CE
	for <freebsd-questions@freebsd.org>;
	Fri, 28 Jan 2005 21:36:14 +0000 (GMT)
Received: from pi.codefab.com (pi.codefab.com [199.103.21.227])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 189D343D1D
	for <freebsd-questions@freebsd.org>;
	Fri, 28 Jan 2005 21:36:14 +0000 (GMT)	(envelope-from cswiger@mac.com)
Received: from localhost (localhost [127.0.0.1])
	by pi.codefab.com (Postfix) with ESMTP id 692405EF0;
	Fri, 28 Jan 2005 16:36:13 -0500 (EST)
Received: from pi.codefab.com ([127.0.0.1])
 by localhost (pi.codefab.com [127.0.0.1]) (amavisd-new, port 10024)
 with ESMTP id 79793-01; Fri, 28 Jan 2005 16:36:12 -0500 (EST)
Received: from [192.168.1.3] (pool-68-161-114-38.ny325.east.verizon.net
	[68.161.114.38])	by pi.codefab.com (Postfix) with ESMTP id D6C2B5EF2;
	Fri, 28 Jan 2005 16:36:11 -0500 (EST)
Message-ID: <41FAB04E.9080606@mac.com>
Date: Fri, 28 Jan 2005 16:36:14 -0500
From: Chuck Swiger <cswiger@mac.com>
Organization: The Courts of Chaos
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US;
	rv:1.7.5) Gecko/20041217
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: "Michael E.Conlen" <meconlen@obfuscated.net>
References: <7dafe99c9578eecb24e826dc7226278b@obfuscated.net>
In-Reply-To: <7dafe99c9578eecb24e826dc7226278b@obfuscated.net>
X-Enigmail-Version: 0.90.0.0
X-Enigmail-Supports: pgp-inline, pgp-mime
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
X-Virus-Scanned: amavisd-new at codefab.com
cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject: Re: pf and different MTUs
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 28 Jan 2005 21:36:14 -0000

Michael E.Conlen wrote:
> I'm using FreeBSD and PF as a firewall between two  networks. I want to 
> change the MTU on one network to 9k but I have to leave the MTU on the 
> other network at 1500 bytes. Will the system handle the fragmenting for 
> me going from the larger MTU to the smaller?

Sure.  However, if you have a lot of traffic using jumbo frames going over 
that 1500 MTU segment, you might be better off using an MTU of 1500 everywhere.

-- 
-Chuck