NAME

       iptunnel - Create and manage IP tunnels

SYNOPSIS

       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 ]

       iptunnel -V | --version

       Where: NAME := STRING
              ADDR := { IP_ADDRESS | any }
              TOS  := { NUMBER | inherit }
              TTL  := { 1..255 | inherit }
              KEY  := { DOTTED_QUAD | NUMBER }

DESCRIPTION

       iptunnel can be used to add, change, delete and show IP tunnels on the machine.

OPTIONS

       help   Show the help text.

       show   List existing IP tunnels.

       { add | change | del } [ NAME ]
              Specify  an  action (add, change or delete an IP tunnel) to be executed by iptunnel
              on the tunnel named NAME, which must be a string.  You must specify one action.

       mode PROTOCOL
              Specify the PROTOCOL to be used for the IP tunnel.  It can be ipip for TCP/IP,  gre
              for Cisco GRE tunnel (RFCs 1701 and 1702), or sit for IPv6-in-IPv4 tunneling.

       remote ADDR
              Set  the  remote  (i.e.,  destination)  address  of the tunnel.  ADDR must be an IP
              address or the word any.

       local ADDR
              Set the local (i.e., source) address of the tunnel.  ADDR must be an IP address  or
              the word any.

       iseq   Require that all incoming packets are serialized.  Only applicable for GRE tunnels.

       oseq   Enable  serialization  (sequencing)  for all outgoing packets.  Only applicable for
              GRE tunnels.

       ikey KEY
              Specify the input key for the Cisco GRE tunnel.  KEY must be either in dotted  quad
              (dotted decimal) or a number.  Only applicable for GRE tunnels.

       okey KEY
              Same as ikey, but set the output key instead.  Only applicable for GRE tunnels.

       icsum  Require  that  all incoming packets have the correct checksum.  Only applicable for
              GRE tunnels.

       ocsum  Calculate checksums for all outgoing packets.  Only applicable for GRE tunnels.

       ttl TTL
              Specify the Time-To-Live value for the IP tunnel.  TTL must be a  value  between  1
              and 255, or the word inherit, which causes the field to be copied from the original
              IP header.

       tos TOS
              Specify the Type-Of-Service value for the IP tunnel.  TOS must be a value between 1
              and 255, or the word inherit, which causes the field to be copied from the original
              IP header.

       nopmtudisc
              Disable Path MTU Discovery on this tunnel.  Note that a fixed ttl  is  incompatible
              with this option.

       dev PHYS_DEV
              Bind the tunnel to the device PHYS_DEV.

HOMEPAGE

       <https://sourceforge.net/projects/net-tools/>

AUTHORS

       This  manpage  was written by Sergio Durigan Junior <sergiodj (at) sergiodj (dot) net>.  A
       few parts were inspired by ip-tunnel(1)'s manpage.

       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.