NAME

     etherpuppet — create a virtual interface from a remote Ethernet interface

SYNOPSIS

     etherpuppet [-s port] [-c target:port] [-B] [-S] [-M filter] [-C] [-i iface]
     etherpuppet [-m] [-s port] [-c target:port] [-I iface]

DESCRIPTION

     etherpuppet is a small program that will create a virtual interface (TUN/TAP) on one machine
     from the ethernet interface of another machine through a TCP connection. Everything seen by
     the real interface will be seen by the virtual one. Everything sent to the virtual interface
     will be emitted by the real one.

     It has been designed because one often has a small machine as his Internet gateway, and
     sometimes want to run some big applications that need raw access to this interface, for
     sniffing (Ethereal, etc.)  or for crafting packets that do not survive being reassembled,
     NATed, etc.

     When launched with the first syntax, etherpuppet is a slave that will send to its master
     everything that passes on the given interface. With the second syntax, etherpuppet is the
     master and will create the special TAP device (whose default name starts with puppet.  In
     both modes, etherpuppet is able to either connect or listen to its slave/master.

     Traffic seen by the real interface is sent through the TCP connection to the doll interface.
     Thus, it is important that this connection is not seen by the real interface (or else, we'll
     have a cute infinite traffic loop).

     The options are as follows:

     -s port
             Listen on the given TCP port.

     -c ip:port
             Connect to the slave/master on the given IP/port.

     -i iface
             Vampirize the given interface name.

     -I ifname
             Choose the name of the virtual interface.

     -m      Master mode.

     -B      Do not use BPF.  With this option, etherpuppet may see its own traffic.

     -S      Build BPF with the content of SSH_CONNECTION environment variable.

     -M src:sp,dst:dp
             Build manually a BPF filter that will exclude matching traffic in both directions.

     -C      Do not copy real interface parameters to virtual interface.

     The source and destination are by default the TCP connection end points. If you go through
     SSH tunneling, you can use the -S option to use SSH_CONNECTION environment variable content
     instead, so that you will filter out the SSH connection of your current session and not the
     connection to the local SSH tunnel end point (which is pointless). If this still not fit
     your needs, you can manually specify the connection end points with -M.

     If you connect two Etherpuppet instances in master mode, you'll get a TCP tunnel through
     virtual interfaces.

     If you connect two Etherpuppet instances in slave mode, you may get some kind of inefficient
     distributed bridge, but more probably, you'll get a big mess.

AUTHORS

     The etherpuppet program was written by Philippe Biondi <phil@secdev.org>.

     This manual page was written by Vincent Bernat <bernat@debian.org>, for the Debian project
     (but may be used by others).