operating system functions. Programs with command-line interfaces are generally easier to automate via scripting. The NTC-
400 Series Router supports both Telnet and SSH (Secure Shell) CLI with default service port 23 and 22, respectively.
Telnet & SSH Scenario
Figure 324 – Telnet & SSH Scenario
Scenario Application Timing
When the administrator of the router wants to manage it from remote site on the Intranet or Internet, they may use the
"Telnet with CLI" function.
Scenario Description
The Local Admin or the Remote Admin can manage the router by using a "Telnet" or "SSH" utility with a privileged user name
and password.
Data packets between the Local Admin and the router or between the Remote Admin and the router can be plain texts or
encrypted texts. We recommend that they are plain text in the Intranet for Local Admin to use a "Telnet" utility, and
encrypted texts in the Internet for Remote Admin to use an "SSH" utility.
Parameter Setup Example
The following table lists the parameter configuration as an example for the router in the diagram above with "Telnet with
CLI" enabled on the LAN and WAN interfaces.
Use default values for those parameters that are not mentioned in the table.
Configuration Path
[Telnet with CLI]-[Configuration]
Telnet with CLI
LAN: â– Enable WAN: â– Enable
Connection Type
Telnet: Service Port 23 â– Enable
SSH: Service Port 22 â– Enable
Table 197 – Telnet Parameter Setup Example
Scenario Operation Procedure
In the diagram above, "Local Admin" or "Remote Admin" can manage the router on the Intranet or Internet. The router is the
gateway of Network-A, and the subnet of its Intranet is 10.0.75.0/24. It has the IP address of 10.0.75.2 for the LAN interface
and 118.18.81.33 for the WAN-1 interface. It serves as a NAT gateway.
The "Local Admin" on the Intranet uses a "Telnet" utility with a privileged account to log in the router and the "Remote
Admin" on the Internet uses an "SSH" utility with a privileged account to login the router.
The administrator of the router can control the device as if they are in front of it.
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