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+.\" Hey, EMACS: -*- nroff -*-
+.\" Copyright (C) 2018 Sergio Durigan Junior <sergiodj@sergiodj.net>
+.\"
+.\" This program is free software; you can redistribute it and/or
+.\" modify it under the terms of the GNU General Public License
+.\" as published by the Free Software Foundation; either version
+.\" 2 of the License, or (at your option) any later version.
+.\"
+.\" $Id$
+.TH IPTUNNEL 8 "version 1.60" "February 2018"
+.\" Please adjust this date whenever revising the manpage.
+.\"
+
+.SH NAME
+
+iptunnel \- Create and manage IP tunnels
+
+.SH SYNOPSIS
+.B iptunnel
+{ add | change | del | show } [ NAME ]
+  [ mode { ipip | gre | sit } ] [ remote ADDR ] [ local ADDR ]
+  [ [i|o]seq ] [ [i|o]key KEY ] [ [i|o]csum ]
+  [ ttl TTL ] [ tos TOS ] [ nopmtudisc ] [ dev PHYS_DEV ]
+
+.B iptunnel
+\-V | \-\-version
+
+\fBWhere\fP: NAME := STRING
+       ADDR := { IP_ADDRESS | any }
+       TOS  := { NUMBER | inherit }
+       TTL  := { 1..255 | inherit }
+       KEY  := { DOTTED_QUAD | NUMBER }
+
+.SH DESCRIPTION
+
+\fBiptunnel\fP can be used to add, change, delete and show IP tunnels
+on the machine.
+
+.SH OPTIONS
+
+.TP
+.B help
+Show the help text.
+
+.TP
+.B show
+List existing IP tunnels.
+
+.TP
+.B { add | change | del } [ NAME ]
+Specify an action (\fBadd\fP, \fBchange\fP or \fBdelete\fP an IP
+tunnel) to be executed by \fBiptunnel\fP on the tunnel named
+\fBNAME\fP, which must be a string.  You must specify one action.
+
+.TP
+.B mode PROTOCOL
+Specify the \fBPROTOCOL\fP to be used for the IP tunnel.  It can be
+\fBipip\fP for TCP/IP, \fBgre\fP for Cisco GRE tunnel (RFCs 1701 and
+1702), or \fBsit\fP for IPv6-in-IPv4 tunneling.
+
+.TP
+.B remote ADDR
+Set the remote (i.e., destination) address of the tunnel.  \fBADDR\fP
+must be an IP address or the word \fBany\fP.
+
+.TP
+.B local ADDR
+Set the local (i.e., source) address of the tunnel.  \fBADDR\fP must
+be an IP address or the word \fBany\fP.
+
+.TP
+.B iseq
+Require that all incoming packets are serialized.  Only applicable for
+\fBGRE\fP tunnels.
+
+.TP
+.B oseq
+Enable serialization (sequencing) for all outgoing packets.  Only
+applicable for \fBGRE\fP tunnels.
+
+.TP
+.B ikey KEY
+Specify the input key for the Cisco GRE tunnel.  \fBKEY\fP must be
+either in dotted quad (dotted decimal) or a number.  Only applicable
+for \fBGRE\fP tunnels.
+
+.TP
+.B okey KEY
+Same as \fBikey\fP, but set the output key instead.  Only applicable
+for \fBGRE\fP tunnels.
+
+.TP
+.B icsum
+Require that all incoming packets have the correct checksum.  Only
+applicable for \fBGRE\fP tunnels.
+
+.TP
+.B ocsum
+Calculate checksums for all outgoing packets.  Only applicable for
+\fBGRE\fP tunnels.
+
+.TP
+.B ttl TTL
+Specify the \fBTime-To-Live\fP value for the IP tunnel.  \fBTTL\fP
+must be a value between \fB1\fP and \fB255\fP, or the word
+\fBinherit\fP, which causes the field to be copied from the original
+IP header.
+
+.TP
+.B tos TOS
+Specify the \fBType-Of-Service\fP value for the IP tunnel.  \fBTOS\fP
+must be a value between \fB1\fP and \fB255\fP, or the word
+\fBinherit\fP, which causes the field to be copied from the original
+IP header.
+
+.TP
+.B nopmtudisc
+Disable \fBPath MTU Discovery\fP on this tunnel.  Note that a fixed
+\fBttl\fP is incompatible with this option.
+
+.TP
+.B dev PHYS_DEV
+Bind the tunnel to the device \fBPHYS_DEV\fP.
+
+.SH HOMEPAGE
+
+\fB<https://sourceforge.net/projects/net-tools/>\fP
+
+.SH AUTHORS
+
+This manpage was written by Sergio Durigan Junior <sergiodj (at)
+sergiodj (dot) net>.  A few parts were inspired by
+\fBip-tunnel(1)\fP's manpage.
+
+.PP
+Permission is granted to copy, distribute and/or modify this document under the
+terms of the GNU General Public License, Version 2 or any later version published
+by the Free Software Foundation.