iptunnel - Create and manage IP tunnels

       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.

February 2018                                     version 1.60                                       IPTUNNEL(8)

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

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

       iptunnel - Create and manage IP tunnels

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.

       modePROTOCOL
              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.

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

       localADDR
              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.

       ikeyKEY
              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.

       okeyKEY
              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.

       ttlTTL
              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.

       tosTOS
              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  PathMTUDiscovery  on  this  tunnel.   Note that a fixed ttl is incompatible with this
              option.

       devPHYS_DEV
              Bind the tunnel to the device PHYS_DEV.

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 }