I looked around for a solution, and it seemed that it might be in the /etc/ssh/ssh_config file. However, this is read-only and cannot be modified, nor can the permissions be changed using chmod.
That's the system-wide configuration file, which only the administrator should edit. Put your own configuration in ".ssh/config" in your home directory. "man ssh_config" describes the file format. (You can even put your user name and the server's full name there, so you can type "ssh school" instead of "ssh -l login_name server.school.example.tld".
Note that this configures the SSH client. You won't be allowed to reconfigure the server.
Björn Persson
