Computer Laboratory

Remote access to Lab Systems

This page explains how to access Computer Laboratory systems from accounts on machines outside the Computer Laboratory network

It is specifically to do with access to Unix/Linux systems, not Windows systems. For the latter see Integrating Private [Windows] machines. Also, it relates to making a connection from machines already connected to the Internet. The process of connecting home machines to the Internet is described here.

Connection methods

There are a number of different connection methods. This section describes each one in decreasing order of preference. I.e. it is recommended you use the first one in the following list that works.

SSH direct to host authenticating using a private key.

In this method you establish one or more public/private keys which you use to authenticate ssh connections directly to Lab machines. For details see Using SSH to connect to the Lab.

SSH to slogin.cl.cam.ac.uk authenticating using one time passwords

In this method you set up a set of one-time passwords which you use to authenticate ssh connections to ssh relay machines. From there you can use ssh once more to connect to any machines within the lab using Unix passwords, host based authentication or private keys. For details on setting up and using one-time passwords see One-time Passwords.

Connecting using telnet to a relay which allows one-time password authentication to establish a connection to slogin.cl.cam.ac.uk.

In this method you set up a set of one-time passwords and telnet to a gateway from which you use the one-time passwords to authenticate ssh connections to slogin.cl.cam.ac.uk from which you use ssh to connect to any lab host using private key authentication. For details on setting up and using one-time passwords see One-time Passwords. For details about the telnet gateway see SSH Gateway and Relay Services.