![]() You can use this technique to access internal websites that remain only accessible behind a jump host. This is useful for browsing to a website that is normally not directly accessible. This allows you to proxy application traffic and send it to a jump host. SOCKS ProxyĪnother cool feature enabled on many systems is SOCKS. To terminate the ssh tunnel, run ps aux | grep ssh, search for the correct tunnel and PID, and then run kill 12345 replacing 12345 with the PID on your machine. So if you were to make another connection, you will see an additional netstat entry with another local port generated for the second connection. This allows for multiple connections to be forwarded through port 4001. The SSH client is forarding traffic over local port 4001 to randomly selected open local port 64356 which is then sent over the SSH tunnel, which eventually lands at 192.168.20.10 port 22. Observe the output:Įvery 2.0s: netstat -abn | grep 4001 My-Cool-Macbook.local: Mon Sep 16 16:08:03 2019 This will run the command every 2 seconds and print the output to the screen. If you are curious about what your system is doing from a network perspective, open a separate terminal and run the following command before you create the SSH tunnel: This is useful if ssh is going to ask for passwords or passphrases, but the user wants it in the background.
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