ZyXEL ZyWALL 5 User Guide - Page 507
The SSH Screen, Configuring the SSH Screen
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Chapter 27 Remote Management Screens Table 149 ADVANCED > REMOTE MGMT > WWW (continued) LABEL DESCRIPTION Server Access Select the interface(s) through which a computer may access the ZyWALL using this service. Secure Client IP Address A secure client is a "trusted" computer that is allowed to communicate with the ZyWALL using this service. Select All to allow any computer to access the ZyWALL using this service. Choose Selected to just allow the computer with the IP address that you specify to access the ZyWALL using this service. Apply Click Apply to save your customized settings and exit this screen. Reset Click Reset to begin configuring this screen afresh. 27.5 The SSH Screen You can use SSH (Secure SHell) to securely access the ZyWALL's SMT or command line interface. Specify which interfaces allow SSH access and from which IP address the access can come. Unlike Telnet or FTP, which transmit data in plaintext (clear or unencrypted text), 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 305 SSH Communication Over the WAN Example SSH Implementation on the ZyWALL Your ZyWALL supports SSH version 1.5 using RSA authentication and three encryption methods (DES, 3DES and Blowfish). The SSH server is implemented on the ZyWALL for remote SMT management and file transfer on port 22. Only one SSH connection is allowed at a time. Requirements for Using SSH You must install an SSH client program on a client computer (Windows or Linux operating system) that is used to connect to the ZyWALL over SSH. 27.6 Configuring the SSH Screen Click ADVANCED > REMOTE MGMT > SSH to change your ZyWALL's Secure Shell settings. ZyWALL 5/35/70 Series User's Guide 507
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