External SSH Access to ISIMA/LIMOS Computing Resources

To access the computing resources of the IIA and LIMOS via SSH, the following prerequisites must be met:

• Have an account
• Have submitted your public key via the ticket manager

If you are unsure what a public key is, please consult the Public/Private Key Authentication section.

SSH Connection to ext.limos.fr

The SSH server is located at ext.limos.fr and listens on port 2225.

Attention

The server ext.limos.fr is not intended for storing your files. You may use it as a temporary zone for a few dozen minutes to transfer data to/from the computing servers.

Connecting from Linux or Mac

To establish such a connection on Linux or macOS, you can use the following command:

ssh your_username@ext.limos.fr -p 2225

If you wish to connect to Linux resources in graphical mode (X), you can use the following command:

ssh -Y your_username@ext.limos.fr -p 2225

If you are using a Mac, this assumes you have previously installed XQuartz.

Once connected to the bastion host, you will need to initiate another SSH connection with X forwarding enabled using the following command:

ssh -Y your_username@final_server

Connecting from Windows

You can use PuTTY to connect via SSH from a Windows machine. Note that you must specify the following information:

• The server address noted below under "Host Name (or IP address)"
• The port must be set to 2225 as shown below

• Provide the path to your private key file that corresponds to the public key you previously sent to cri-commun@isima.fr. This setting is found under "Connection/SSH/Auth" then "Private key file for authentication".

If you wish to connect in graphical mode from PuTTY, you will need to enable "X forwarding" in the X11 configuration panel of PuTTY. This requires that you have previously installed an X server for Windows. A popular X server for Windows is Xming.