ZyXEL Communications NWA3550 - Manual (Page 153)

Chapter 13 Remote Management Screens
NWA3550 User’s Guide
153
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.
The client automatically saves any new server public keys. In subsequent connections,
the server public key is checked against the saved version on the client computer.
2 Encryption Method
Once the identification is verified, both the client and server must agree on the type of
encryption method to use.
3 Authentication and Data Transmission
After the identification is verified and data encryption activated, a secure tunnel is
established between the client and the server. The client then sends its authentication
information (user name and password) to the server to log in to the server.
13.4 SSH Implementation on the ZyXEL Device
Your ZyXEL Device supports SSH version 1.0 using RSA authentication and three encryption
methods (DES, 3DES and Blowfish). The SSH server is implemented on the ZyXEL Device
for remote SMT management and file transfer on port 22. Only one SSH connection is allowed
at a time.
13.4.1 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 ZyXEL Device over SSH.
13.5 Configuring Telnet
You can use Telnet to access the ZyXEL Device’s SMT or command line interface. Specify
which interfaces allow Telnet access and from which IP address the access can come.
Click the REMOTE MGNT > TELNET. The following screen displays.
"
It is recommended that you disable Telnet and FTP when you configure SSH
for secure connections.