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Date:      Wed, 19 May 2004 11:16:17 +0300
From:      Peter Pentchev <roam@ringlet.net>
To:        "Dmitry A. Bondareff" <freebsd@mmk.ru>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: IP frag need
Message-ID:  <20040519081617.GE988@straylight.m.ringlet.net>
In-Reply-To: <026201c43d69$b0d695d0$02010101@wall>
References:  <026201c43d69$b0d695d0$02010101@wall>

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On Wed, May 19, 2004 at 12:22:41PM +0600, Dmitry A. Bondareff wrote:
> Hello hackers!
>=20
> I have two office in the Internet.
> And now I trying to make VPN between it.
>=20
> I using mpd for it.
>=20
>=20
> 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
>=20
> Client trying to use mounted disk from WindowsNT
>=20
> 11.8.24.25 - WindowsNT
> 11.8.11.1 - FreeBSD
>=20
> 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)
>=20
> As you can see IP frag needed, but WindowsNT don't want to do it.
>=20
> What I cat do on FreeBSD box to solve the problem ??

If you are using a recent version of mpd, try putting the following line:
  set iface enable tcpmssfix
in your bundle definition in mpd.conf.

G'luck,
Peter

--=20
Peter Pentchev	roam@ringlet.net    roam@sbnd.net    roam@FreeBSD.org
PGP key:	http://people.FreeBSD.org/~roam/roam.key.asc
Key fingerprint	FDBA FD79 C26F 3C51 C95E  DF9E ED18 B68D 1619 4553
No language can express every thought unambiguously, least of all this one.

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