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Settings

When I am physically in the office, both the "local" and the "remote" machines are behind the same firewall, and the "remote" machine is accessible by simple ssh command: ssh username@local_IP_of_the_remote_server. Then, the following steps get me to access a "Jupyter lab session" hosted on a more powerful "remote" machine by visiting localhost:7777 on a "local" machine:

  • On the "remote" machine, fire: jupyter lab --no-browser --port=7777;
  • On the "local" machine, issue the following tunneling command to "grab the port 7777 to the local machine": ssh -Y -N -L localhost:7777:localhost:7777 username@local_IP_of_the_remote_server

Got tunneling to work with SSH

I wonder if it is possible to use the "Jupyter lab session" when I am physically out of office? For now, I can visit the "remote" machine in the office by the following steps:

  • Step 1: on the "reomte" server, issue command: ssh -R 0.0.0.0:2210:localhost:22 user_on_VPS@IP_for_VPS; (I also set GatewayPorts yes in /etc/ssh/sshd_config to accompany the 0.0.0.0 wildcard)
  • Step 2: on arbitrary machine that is roaming out of the office, use port 2210 on the VPS to establish SSH connection, by: ssh -p 2210 user_on_VPS@IP_for_VPS

Failed with getting tunneling to work for the Jupyter thing

Here goes my failed attempt:

  • Step 1: on the "remote" machine, ssh -R 0.0.0.0:4349:localhost:4349 user_on_VPS@IP_for_VPS
  • Step 2: on the "local" machine that is roaming out of the firewall: ssh -Y -fN -L localhost:4349:localhost:4349 user_on_VPS@IP_for_VPS

Questions

  1. How to tweak the ssh command to get localhost:4349 usable by a "local" machine that is roaming out of the firewall?
  2. Would it be safer to only open ports for Jupyter notebook compared to hosting reverse tunneling at all times?

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