From owner-freebsd-hackers@FreeBSD.ORG  Tue May 18 23:21:46 2004
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From: "Dmitry A. Bondareff" <freebsd@mmk.ru>
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Date: Wed, 19 May 2004 12:22:41 +0600
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Subject: IP frag need
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Hello hackers!

I have two office in the Internet.
And now I trying to make VPN between it.

I using mpd for it.


Client ---> (mtu=3D1500) FreeBSD (mtu=3D1024) =
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D VPN over Internet
=3D=3D=3D=3D=3D=3D> (mtu=3D1024)FreeBSD (mtu=3D1500)---> WindowsNT

Client trying to use mounted disk from WindowsNT

11.8.24.25 - WindowsNT
11.8.11.1 - FreeBSD

tcpdump info:
17:26:55.100097 11.8.24.25.139 > 11.8.11.1.1049: tcp 1460 (DF)
17:26:55.100175 11.8.11.1 > 11.8.24.25: icmp: 11.8.11.1 unreachable - =
need
to frag (mtu 1024) (DF)
17:26:57.287737 11.8.24.25.139 > 11.8.11.1.1049: tcp 1460 (DF)
17:26:57.287813 11.8.11.1 > 11.8.24.25: icmp: 11.8.11.1 unreachable - =
need
to frag (mtu 1024) (DF)

As you can see IP frag needed, but WindowsNT don't want to do it.

What I cat do on FreeBSD box to solve the problem ??

Dmitry.
(Sorry for my English)