# Connecting from a Linux Client

## SSH without X11 Forwarding

This is the standard method. Official X11 support is provided through [NoMachine](nomachine.md).
For normal SSH sessions, use your SSH client as follows:

```bash
ssh $username@merlin-l-01.psi.ch
ssh $username@merlin-l-001.psi.ch
ssh $username@merlin-l-002.psi.ch
```

## SSH with X11 Forwarding

Official X11 Forwarding support is through NoMachine. Please follow the document
[{Job Submission -> Interactive Jobs}](../slurm-general-docs/interactive-jobs.md#requirements) and
[{Accessing Merlin -> NoMachine}](nomachine.md) for more details. However,
we provide a small recipe for enabling X11 Forwarding in Linux.

* For enabling client X11 forwarding, add the following to the start of `~/.ssh/config`
to implicitly add `-X` to all ssh connections:

   ```bash
   ForwardAgent yes
   ForwardX11Trusted yes
   ```

* Alternatively, you can add the option `-Y` to the `ssh` command. In example:

   ```bash
   ssh -X $username@merlin-l-01.psi.ch
   ssh -X $username@merlin-l-001.psi.ch
   ssh -X $username@merlin-l-002.psi.ch
   ```

* For testing that X11 forwarding works, just run `xclock`. A X11 based clock should
popup in your client session:

   ```bash
   xclock
   ```