Technical data

BLADE OS 5.0 Command Reference
16
 Chapter 1: The Command Line Interface BMD00142, November 2009
Connecting to the Switch via Telnet
A Telnet connection offers the convenience of accessing the switch from any workstation connected
to the network. Telnet access provides the same options for user access and administrator access as
those available through the console port.
To configure the switch for Telnet access, the switch must have an IP address. The switch can get its
IP address in one of two ways:
 Dynamically, from a DHCP server on your network
 Manually, when you configure the switch IP address
Once you have configured the switch with an IP address and gateway, you can access the switch
from any workstation connected to the management network. Telnet access provides the same
options for user and administrator access as those available through the console port.
By default, Telnet access is enabled. Use the following command to disable/enable Telnet access:
To establish a Telnet connection to the switch, you can run the Telnet program on your workstation
and issue the Telnet command, followed by the switch IP address:
Connecting to the Switch via SSH
Although a remote network administrator can manage the configuration of a G8124 via Telnet, this
method does not provide a secure connection. The SSH (Secure Shell) protocol enables you to
securely log into another device over a network to execute commands remotely. As a secure
alternative to using Telnet to manage switch configuration, SSH ensures that all data sent over the
network is encrypted and secure.
The switch can do only one session of key/cipher generation at a time. Thus, a SSH/SCP client will
not be able to login if the switch is doing key generation at that time. Similarly, the system will fail
to do the key generation if a SSH/SCP client is logging in at that time.
The supported SSH encryption and authentication methods are listed below.
 Server Host Authentication: Client RSA-authenticates the switch in the beginning of every con-
nection.
 Key Exchange: RSA
 Encryption: 3DES-CBC, DES
 User Authentication: Local password authentication, RADIUS, TACACS+
# /cfg/sys/access/tnet e|d
telnet <switch IP address>