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Top Forums UNIX for Advanced & Expert Users ssh port forward over three server Post 302235208 by Art007 on Thursday 11th of September 2008 10:50:49 AM
Old 09-11-2008
ssh port forward over three server

Hello there,

I have a big problem, and I hope somebody can help me. I try to realize a port forward over three server. Here is a picture...

Client Server1 | Server2
------- ------- | -------
|...... | |...... | | |...... |
|...... | |...... | | |...... |
|...... | |...... | | |...... |
|...... | |...... | | |...... |
------- ------- | -------

Server2 is behind a firewall. Server1 is able to connect via ssh to server2.
The Client is able to connect via ssh to Server1.

From Server1 I can make a port forward like this.

Server1> ssh -L 1111:server2:2222 server2

This works fine.
But I want to connect the Port 1111 from the Client.

Client> ssh -L 1111:server1:1111 server1
This did not help.
What is wrong?
All the servers are UNIX servers.

Many thanks for your help!
 

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ssh-socks5-proxy-connect(1)					   User Commands				       ssh-socks5-proxy-connect(1)

NAME
ssh-socks5-proxy-connect - Secure Shell proxy for SOCKS5 SYNOPSIS
/usr/lib/ssh/ssh-socks5-proxy-connect [-h socks5_proxy_host] [-p socks5_proxy_port] connect_host connect_port DESCRIPTION
A proxy command for ssh(1) that uses SOCKS5 (RFC 1928). Typical use is where connections external to a network are only allowed via a socks gateway server. This proxy command does not provide any of the SOCKS5 authentication mechanisms defined in RFC 1928. Only anonymous connections are possi- ble. OPTIONS
The following options are supported: -h socks5_proxy_host Specifies the proxy web server through which to connect. Overrides the SOCKS5_SERVER environment variable. -p socks5_proxy_port Specifies the port on which the proxy web server runs. If not specified, port 80 is assumed. Overrides the SOCKS5_PORT environment variable. OPERANDS
The following operands are supported: socks5_proxy_host The host name or IP address (IPv4 or IPv6) of the proxy. socks5_proxy_port The numeric port number to connect to on socks5_proxy_host. connect_host The name of the remote host to which the socks gateway is to connect you. connect_port The numeric port number of the socks gateway to connect you to on connect_host. EXAMPLES
The recommended way to use a proxy connection command is to configure the ProxyCommand in ssh_config(4) (see Example 1 and Example 2). Example 3 shows how the proxy command can be specified on the command line when running ssh(1). Example 1: Setting the proxy from the environment The following example uses ssh-socks5-proxy-connect in ssh_config(4) when the proxy is set from the environment: Host playtime.foo.com ProxyCommand /usr/lib/ssh/ssh-socks5-proxy-connect playtime.foo.com 22 Example 2: Overriding proxy environment variables The following example uses ssh-socks5-proxy-connect in ssh_config(4) to override (or if not set) proxy environment variables: Host playtime.foo.com ProxyCommand /usr/lib/ssh/ssh-socks5-proxy-connect -h socks-gw -p 1080 playtime.foo.com 22 Example 3: Using the command line The following example uses ssh-socks5-proxy-connect from the ssh(1) command line: example$ ssh -o'ProxyCommand=/usr/lib/ssh/ssh-socks5-proxy-connect -h socks-gw -p 1080 playtime.foo.com 22' playtime.foo.com ENVIRONMENT VARIABLES
SOCKS5_SERVER Takes socks5_proxy_host operand to specify the default proxy host. SOCKS5_PORT Takes socks5_proxy_port operand to specify the default proxy port. EXIT STATUS
The following exit values are returned: 0 Successful completion. 1 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWsshu | +-----------------------------+-----------------------------+ |Interface Stability |Stable | +-----------------------------+-----------------------------+ SEE ALSO
ssh(1), ssh-http-proxy-connect(1), ssh_config(4), attributes(5) SunOS 5.10 30 Oct 2002 ssh-socks5-proxy-connect(1)
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