ZyXEL Communications NXC8160 4.3 How SSH Works

Chapter 4 Centralized Configuration

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 NXC-8160 for a management session.

"If the NXC-8160 is behind a NAT router or a firewall, you need to configure the router or firewall to allow a SSH connection to the NXC-8160.

Figure 11 SSH Communication Over the WAN Example

4.3 How SSH Works

The following table summarizes how a secure connection is established between two remote hosts.

Figure 12 How SSH Works

42
	NXC-8160 User’s Guide