Configuration procedure – H3C Technologies H3C S3100 Series Switches User Manual
Page 48
3-3
Authentication
mode
Telnet configuration
Description
Manage VTY users
Set service type for VTY
users
Required
Perform common
configuration
Perform common Telnet
configuration
Optional
Refer to
.
To improve security and prevent attacks to the unused Sockets, TCP 23 and TCP 22, ports for Telnet
and SSH services respectively, will be enabled or disabled after corresponding configurations.
z
If the authentication mode is none, TCP 23 will be enabled, and TCP 22 will be disabled.
z
If the authentication mode is password, and the corresponding password has been set, TCP 23
will be enabled, and TCP 22 will be disabled.
z
If the authentication mode is scheme, there are three scenarios: when the supported protocol is
specified as telnet, TCP 23 will be enabled; when the supported protocol is specified as ssh, TCP
22 will be enabled; when the supported protocol is specified as all, both the TCP 23 and TCP 22
port will be enabled.
Telnet Configuration with Authentication Mode Being None
Configuration Procedure
Table 3-4 Telnet configuration with the authentication mode being none
Operation
Command
Description
Enter system view
system-view
—
Enter one or more VTY user
interface views
user-interface vty first-number
[ last-number ]
—
Configure not to authenticate
users logging into VTY user
interfaces
authentication-mode none
Required
By default, VTY users are authenticated
after logging in.
Configure the command level
available to users logging into
VTY user interface
user privilege level level
Optional
By default, commands of level 0 are
available to users logging into VTY user
interfaces.
Configure the protocols to be
supported by the VTY user
interface
protocol inbound { all | ssh |
telnet }
Optional
By default, both Telnet protocol and SSH
protocol are supported.
Set the commands to be
executed automatically after a
user login to the user interface
successfully
auto-execute command text
Optional
By default, no command is executed
automatically after a user logs into the
VTY user interface.