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       6tunnel - tunnelling for application that don’t speak IPv6


       6tunnel  [ -146dhfv ] [ -u username ] [ -i password ] [ -I password ] [
       -l local_host ] [ -L limit ] [ -p pid_file ] [ -m map_file ] local_port
       remote_host [ remote_port ]


       6tunnel  allows  you  to  use  services  provided  by  IPv6  hosts with
       IPv4-only applications and vice-versa. It can bind to any of your  IPv4
       (default)  or  IPv6  addresses  and  forward  all  data to IPv4 or IPv6
       (default) host. For example

              6tunnel -1 6668 6667

       will be enough to connect to IPv6 irc server with

              irc foobar localhost:6668

       If you don’t wish to run 6tunnel every  time  you  want  to  show  your
       :c001:  or  :dead: IPv6 address on IRC, you can use -i parameter, which
       makes 6tunnel ask your client for specified password. Just run

              6tunnel -i dupa.8 31337 6667

       and then type

              irc foobar localhost:31337:dupa.8

       If your IRC server requires you to send password, specify  it  with  -I
       parameter -- after successful proxy authentication 6tunnel will send it
       to the server.

       6tunnel can also be used as a tunnel for all other combinations of IPv4
       and  IPv6  endpoints.  If  remote host doesn’t have any IPv6 addresses,
       6tunnel will use the IPv4 one. In other cases, use -4  parameter  which
       makes  IPv4  address  the preffered one. For IPv6-to-any tunnels use -6
       which makes 6tunnel bind to IPv6 address.


       -1     Exit after first connection.

       -4     Preffer IPv4 endpoint if the machine has both address types.

       -6     Listen on IPv6 address (IPv4 is default).

       -d     Don’t detach.

       -f     Force tunneling even if remote host is  not  resolvable  at  the
              execution time.

       -h     Print hex dump of every packet received or sent (hu-huh, Beavis,
              he said hex dump!)

       -u username
              Change UID and GID after bind().

       -i password
              Act as an IRC proxy and require user to authenticate.

       -I password
              If you are using 6tunnel as an IRC  proxy  and  the  IRC  server
              requires you to send password, place it right here.

       -l local_host
              Listen on specified address (IPv4, or IPv6 if -6 used).

       -L limit
              Limit simultaneous connections.

       -p pid_file
              Write down pid to specified file.

       -s source_host
              Connect to the remote host using specified source address.

       -m map_file
              Binds  to  specified  IPv6  addresses  on  basis  of source IPv4
              address. The file contains one mapping per line with IPv4 source
              address  and  corresponding  IPv6 address. Only listed hosts are
              allowed to connect. If you want to allow any host,  add  mapping
              for default or address. Example:


       -v     Be verbose and don’t detach.


       Sending SIGHUP forces map file reload.


       #ipv6 crew, Lam.


       Terrible  man  page. Hex dump doesn’t include IRC proxy authentication.
       IRC proxy requires your client to  send  password  first  (don’t  worry
       ircii,  EPIC,  BitchX, mIRC and many more will work). No logging except
       debug output.


       Wojtek    Kaniewski    (,    Dariusz     Jackowski
       (, Ramunas Lukosevicus (



                                 Aug 18, 2005