NAME

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

SYNOPSIS

       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 ]

DESCRIPTION

       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 irc6.net 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 irc6.net 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 preferred one. For IPv6-to-any tunnels use -6 which makes  6tunnel  bind  to
       IPv6 address.

OPTIONS

       -1     Exit after first connection.

       -4     Prefer 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.

       -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 0.0.0.0 address. Example:

              192.168.0.2 3ffe:8010:18::1000:2
              192.168.0.3 3ffe:8010:18::1000:3

       -v     Be verbose and don't detach.

NOTES

       Option -H to disable all resolver hints has been removed since proper combination of -4 and -6 will yield
       in any combination of IPv4 and IPv6 sources and destinations.

SIGNALS

       Sending SIGHUP forces map file reload.

THANKS

       #ipv6 crew, Lam.

BUGS

       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.

AUTHORS

       Wojtek   Kaniewski  (wojtekka@toxygen.net),  Dariusz  Jackowski  (ascent@linux.pl),  Ramunas  Lukosevicus
       (lukoramu@parok.lt), Roland Stigge (stigge@antcom.de)

SEE ALSO

       ssh(1)

                                                  Oct 19, 2019                                        6TUNNEL(1)