User's Manual

User’s Manual of SGS-5240 Series Managed Switch
224
4.7.6 SSH
4.7.6.1 Global Configuration
Security > SSH > Global Configuration page is used to enable the SSH server and configure basic settings for authentication.
 SSH Server Status – Allows you to enable/disable the SSH server on the switch. (Default: Disabled)
 Version – The Secure Shell version number. Version 2.0 is displayed, but the switch supports management access via
either SSH Version 1.5 or 2.0 clients.
 Authentication Timeout – Specifies the time interval in seconds that the SSH server waits for a response from a client
during an authentication attempt. (Range: 1-120 seconds; Default: 120 seconds)
 Authentication Retries – Specifies the number of authentication attempts that a client is allowed before authentication
fails and the client has to restart the authentication process. (Range: 1-5 times; Default: 3)
 The host key is shared with the SSH client, and is fixed at 1024 bits.
4.7.6.2 Key of Switch
Security > SSH > Key of Switch page is used to generate a host public/private key pair used to provide secure communications
between an SSH client and the switch. After generating this key pair, you must provide the host public key to SSH clients and
import the client’s public key to the switch.
 Host-Key Type – The key type used to generate the host key pair (i.e., public and private keys). (Range: RSA (Version 1),
DSA (Version 2), Both; Default: Both)
The SSH server uses RSA or DSA for key exchange when the client first establishes a connection with the switch, and
then negotiates with the client to select either DES (56-bit) or 3DES (168-bit) for data encryption.