H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 43)

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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
Follow these steps to perform Telnet configuration with the authentication mode being none:
To do… Use the command… Remarks
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 in to VTY user
interfaces
authentication-mode none
Required
By default, VTY users are authenticated
after logging in.
Configure the command
level available to users
logging in to VTY user
interface
user privilege level level
Optional
By default, commands of level 0 are
available to users logging in to 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 in to the
VTY user interface.
Make terminal services
available
shell
Optional
By default, terminal services are
available in all user interfaces.
Set the maximum
number of lines the
screen can contain
screen-length screen-length
Optional
By default, the screen can contain up to
24 lines.
You can use the screen-length 0
command to disable the function to
display information in pages.