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Bridging with SSH Tunnels
Post 16641 by auswipe on Tuesday 5th of March 2002 03:33:18 PM
03-05-2002
I am not using a VPN to access the box at the house.
I do not have direct access to the FreeBSD box (the gotcha).
Here is a diagram that might explain things better:
I want to enable a SSH Tunnel to the OpenBSD Box that will communicate with another pre-established SSH Tunnel between the OpenBSD box and the FreeBSD box.
I have not (yet) enabled NAT/Port forwarding on the OpenBSD box.
The idea is that I want to tunnel my way all the way past the OpenBSD box into the FreeBSD box. I can setup a tunnel between the OpenBSD box to the FreeBSD box without any problems (already tested, works like a charm). This way, I never have to expose any extra ports to the world other than my already exposed SSH port. I also wanted to bypass a VPN for this. When I VPN into work from my Win2K box, all my other networks get dropped and I wanted to avoid this.
Clear as mud?
I do not have direct access to the FreeBSD box (the gotcha).
Here is a diagram that might explain things better:
I want to enable a SSH Tunnel to the OpenBSD Box that will communicate with another pre-established SSH Tunnel between the OpenBSD box and the FreeBSD box.
I have not (yet) enabled NAT/Port forwarding on the OpenBSD box.
The idea is that I want to tunnel my way all the way past the OpenBSD box into the FreeBSD box. I can setup a tunnel between the OpenBSD box to the FreeBSD box without any problems (already tested, works like a charm). This way, I never have to expose any extra ports to the world other than my already exposed SSH port. I also wanted to bypass a VPN for this. When I VPN into work from my Win2K box, all my other networks get dropped and I wanted to avoid this.
Clear as mud?
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LEARN ABOUT CENTOS
libssh2_channel_direct_tcpip_ex
libssh2_channel_direct_tcpip_ex(3) libssh2 manual libssh2_channel_direct_tcpip_ex(3) NAME
libssh2_channel_direct_tcpip_ex - Tunnel a TCP connection through an SSH session SYNOPSIS
#include <libssh2.h> LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip_ex(LIBSSH2_SESSION *session, const char *host, int port, const char *shost, int sport); LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip(LIBSSH2_SESSION *session, const char *host, int port); DESCRIPTION
session - Session instance as returned by libssh2_session_init_ex(3) host - Third party host to connect to using the SSH host as a proxy. port - Port on third party host to connect to. shost - Host to tell the SSH server the connection originated on. sport - Port to tell the SSH server the connection originated from. Tunnel a TCP/IP connection through the SSH transport via the remote host to a third party. Communication from the client to the SSH server remains encrypted, communication from the server to the 3rd party host travels in cleartext. RETURN VALUE
Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors. ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed. SEE ALSO
libssh2_session_init_ex(3) libssh2 0.15 1 Jun 2007 libssh2_channel_direct_tcpip_ex(3)