FW: TCPIP MTU settings (fwd)

Tina Bird tbird at listserv.secnetgroup.com
Thu Jul 29 06:12:24 EDT 1999



---------- Forwarded message ----------
Date: Thu, 29 Jul 1999 11:30:03 -0400
From: Gregory Perry <Gregory.Perry at netsec.net>
To: owner-vpn at listserv.secnetgroup.com
Subject: FW: TCPIP MTU settings

Several utilities exist for Wintel platforms to reduce MTU settings "on-the-fly" - EZMTU is one such free package (http://members.tripod.com/~EasyMTU/easymtu/index.html).  Makes a big difference even on regular dialup sessions.

--greg



> -----Original Message-----
> From: owner-vpn at listserv.secnetgroup.com
> [mailto:owner-vpn at listserv.secnetgroup.com]On Behalf Of Robert Moskowitz
> Sent: Monday, July 19, 1999 11:20 AM
> To: guy.raymakers at europe.eds.com; vpn at listserv.secnetgroup.com
> Subject: Re: TCPIP MTU settings
> 
> 
> At 09:36 AM 7/19/99 +0100, guy.raymakers at europe.eds.com wrote:
> >
> >The remote network (offices) have a NT server and an IPsec 
> enabled router. The
> >router encapsulates the TCP/IP packets into IPsec packets.  When 
> using the
> >default tcpip MTU ( = 1500), on the NT server,  we get problems 
> when doing
> file
> >transfers. When we lower the tcpip MTU to 1444 we don't have 
> these problems.
> >The remote office ISP is a different one then our ISP.
> >
> THere is extensive discussion in the IPsec specification about potential
> MTU issues (MObileIP does likewise).  You have two choices:  MTU 
> discovery,
> or static reduction of MTU to get through the tunnel.
> 
> 
> Robert Moskowitz
> ICSA, Inc.
> 	(248) 968-9809
> Fax:	(248) 968-2824
> rgm at icsa.net
> 
> There's no limit to what can be accomplished 
> if it doesn't matter who gets the credit
> 
> 
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