From owner-freebsd-questions  Mon Jan 13  9:15:55 2003
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Date: Mon, 13 Jan 2003 11:15:48 -0600 (CST)
From: Scott Pilz <tech@tznet.com>
To: freebsd-questions@freebsd.org, <freebsd-security@freebsd.org>
Subject: MPD/VPN 
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	I'm open to suggestions on this one. I have tried everything :(
I'm hoping that someone else ran into this problem and knows how to fix
it.

	MPD/FREEBSD as a VPN server.

	Multiple clients (windows and unix).

Windows 98: Works great, connects, tiny performance drop in speed, hardly
noticeable.

Windows 2000: Works just as well as Windows 98 if not better.

Windows XP: I can connect, ping through the VPN, even load tiny web pages
and telnet out - but anything large stalls completely.

I've tried multiple XP machines, they all do the same thing.

It is my understanding that this is a MTU issue - but I find it very hard
to believe that Microsoft products need configuration before they work,
such as a MTU change.

Heres mpd.conf for what it's worth (I've excluded the clients):

client_standard:
        set iface disable on-demand
        set iface enable proxy-arp
        set iface idle 86400
        set bundle disable multilink
        set link yes acfcomp protocomp
        set link disable pap
        set link enable chap
        set link keep-alive 10 60
        set ipcp yes vjcomp
        set ipcp dns 66.170.64.1 66.170.64.13
        set bundle enable compression
        set bundle enable crypt-reqd
        set ccp yes mppc
        set ccp yes mpp-e40
        set ccp yes mpp-e128
        set ccp yes mpp-stateless


	One other thing - I notice that the two clients that do work (any
Windows 98 or 2000 box) has a MTU of 1496 on the server:

ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> mtu 1496

	The ones that don't vary but are NOT 1496.

	Any input would be helpful at this point.

<bangs head into desk>

Scott



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