1-17
telnet: Supports Telnet protocol.
Description
Use the protocol inbound command to specify the protocols supported by the user interface.
Both Telnet protocol and SSH protocol are supported by default.
Related commands: user-interface vty.
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.
To configure a user interface to support SSH, you need to set the authentication mode to scheme for
users to log in successfully. If the authentication mode is set to password or none for login users, the
protocol inbound ssh command will fail. Refer to the authentication-mode command for the related
configuration.
Examples
# Configure that only SSH protocol is supported in VTY 0.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] user-interface vty 0
[Sysname-ui-vty0] protocol inbound ssh
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