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Top Forums UNIX for Advanced & Expert Users Help! How to find the local host after few ssh hops to remote host??? Post 302408033 by druidmatrix on Saturday 27th of March 2010 07:47:36 PM
Old 03-27-2010
I'd look for the $SSH_CONNECTION variable in your environment.
# echo $SSH_CONNECTION
172.16.0.201 1840 172.16.0.202 22
 

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ETHERPUPPET(1)						    BSD General Commands Manual 					    ETHERPUPPET(1)

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 con- nection 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). BSD
August 7, 2008 BSD
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