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+.\" Copyright (c) Andrey V. Elsukov <ae@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 7, 2014
+.Dt ME 4
+.Os
+.Sh NAME
+.Nm me
+.Nd encapsulating network device
+.Sh SYNOPSIS
+To compile the
+driver into the kernel, place the following line in the kernel
+configuration file:
+.Bd -ragged -offset indent
+.Cd "device me"
+.Ed
+.Pp
+Alternatively, to load the
+driver as a module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+if_me_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+network interface pseudo device encapsulates datagrams
+into IP.
+These encapsulated datagrams are routed to a destination host,
+where they are decapsulated and further routed to their final destination.
+.Pp
+.Nm
+interfaces are dynamically created and destroyed with the
+.Xr ifconfig 8
+.Cm create
+and
+.Cm destroy
+subcommands.
+.Pp
+This driver corresponds to RFC 2004.
+Datagrams are encapsulated into IP with a shorter encapsulation.
+The original
+IP header is modified and the modifications are inserted between the
+so modified header and the original payload.
+The protocol number 55 is used for outer header.
+.Sh NOTES
+.Pp
+For correct operation, the
+.Nm
+device needs a route to the decapsulating host that does not run over the tunnel,
+as this would be a loop.
+.Sh SEE ALSO
+.Xr gif 4 ,
+.Xr gre 4 ,
+.Xr inet 4 ,
+.Xr ip 4 ,
+.Xr netintro 4 ,
+.Xr protocols 5 ,
+.Xr ifconfig 8 ,
+.Xr sysctl 8
+.Sh AUTHORS
+.An Andrey V. Elsukov Aq Mt ae@FreeBSD.org