Chapter 44 Service Control
44.6 SSH
You can use SSH (Secure SHell) to securely access the ZyWALL’s command line interface. Specify which zones allow SSH access and from which IP address the access can come.
SSH is a secure communication protocol that combines authentication and data encryption to provide secure encrypted communication between two hosts over an unsecured network. In the following figure, computer A on the Internet uses SSH to securely connect to the WAN port of the ZyWALL for a management session.
Figure 445 SSH Communication Over the WAN Example
44.6.1 How SSH Works
The following figure is an example of how a secure connection is established between two remote hosts using SSH v1.
Figure 446 How SSH v1 Works Example
1Host Identification
The SSH client sends a connection request to the SSH server. The server identifies itself with a host key. The client encrypts a randomly generated session key with the host key and server key and sends the result back to the server.
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