If it is necessary we can check the listener on the jump server It is accessible locally or we can use the interface address as well if we wish. Do not forget, here the 127.0.0.1 IP address is destination host localhost where we connected. The parameters are same as we discussed earlier. This session open listening port on the jump server what we are going to use with SSH tunnel. – Within this new putty session we open a remote session to target server. On the Windows putty connection is not necessary set any extra option or port forwarding. – open putty session to the jump server and connect toward to the target machine where we use SSH server service. ![]() Transfer data between two remote host using local and revers SSH tunnel The other ORACLE specific parameters must be same as the original SQL connection.ģ. Here like in WinSCP window before, we connect to the local port what firstly will be forwarded to the jump server local port, what secondly will be forwarded to the remote port, where the ORACLE listener listens on. – open Oracle client and test the connection (4) We are able to check the putty how open the tunnel, the port is listening or notĪnd also we are able to check how is working the listener in jump server: – f option tells SSH to go into the background just before it executes the command – T option tells SSH not to allocate a pseudo-tty on the remote system (And what does it means? It is long story □ – N option tells SSH to just set up the tunnel and not prepare command stream – n option tells SSH to associate standard input with /dev/null, … and some useful SSH setting if we want to build just the SSH tunnel in background: – Remote listening port: where the remote service is listens on – Remote destination: is where the remote service is use, in our case this address is ORACLE listener address what is accessible locally. – Local listening port: is where the jump server will be listening the data what have to push toward the remote service – Remote host: what we use to build the second SSH tunnel (basically connect to the SSH service) – on the jump server open SSH session to the target service using local port forwarding to the target Oracle service (3) The destination port matches with the jump server listener port what we are going to open in the next step. That’s why we use for destination address 127.0.0.1, but localhost – in this case – means jump server itself and not the local Windows machine. First we are going to forward the local connection to the jump server. Here the first tunnel is from local computer to the jump server. – set putty SSH tunnel local port forwarding (2) – open putty session to the jump server (1) Create Oracle client connection using SQLNet The username and password must match with remote service access credentials.Ģ. Here we will connect to the local port what is forwarded to remote host. ![]() – open WinSCP session using local listener (what is forwarded to the target service) (3.) We have two different way, and of course it is enough just check in one way □ We are able to check the putty how open the tunnel, the port is listening or not. The format is: destination server and the port where the remote server listens on. In this case we use the remote destination what is accessible from jump server. The destination is where we want to forward the local connection. We can use any free port what is free in our local computer, because it will open a listener. – set putty SSH tunnel local port forwarding (2.) – open putty session to the jump server (1.) Important to know where the service is (hostname) and what port is use (listen on). Because of we do not have direct access to the remote machine in some reason, we use middle server what we call jump server. We use the remote system SSH services to do this. In this scenario we are using Windows application like WinSCP to transfer data to the remote system. With winscp transfer data to target (remote) host using putty forwarding With Google search everyone can do magic □ġ. I do not want to explain the SSH tunnel background, because I don’t know every small aspect of this topic and also I just would like to focus the some useful working examples (best practices). If your task meet one of them, this post will be for you. ![]() – just our architecture determinates that we have to use it. – the service was designed to be only use internally or – we do not want to (or not allow) open a port or Why should we use SSH tunnel?The answer is simple: in many reasons. For example:
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