DPS Telecom NetGuardian Guida di riferimento rapido
DPS Telecom Techno Knowledge Paper
“Your Partners in Network Alarm Management”
Telnet to a NetGuardian
Are you incurring costly windshield time by driving to remote sites
just to access your RTU? Connect to your NetGuardian with Telnet
and handle the process remotely.
Connecting to a NetGuardian with Telnet allows you to uickly
access from a remote location. Establishing a Telnet connection
involves just a few uick steps. Use the following “techno
knowledge” paper to Telnet to your NetGuardian for the first time, or to troubleshoot common
connection issues.
This techno knowledge paper can help you if:
If you are unable to Telnet to your NetGuardian.
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Quick Reference Chart
(for more details, review the troubleshooting checklist, starting on page 2 of this guide)
Unable to Telnet to NetGuardian
Troubleshooting Checklist
□Telnet to port 2002 not the default port 23.
◦This can be specified in most Telnet clients, specifically in
▪Windows Command Prompt:
(Click: Start → Programs → Accessories → Command Prompt OR Start → Run → type “cmd”)
▪Hyperterminal:
(Click: Start → Programs → Accessories → Communications → HyperTerminal)
Windows Command Prompt
In the Command Prompt window, type “Telnet”, the NetGuardian’s IP address, and “2002”. Press Enter.
If the connection is successful, you will be prompted for a password (default password is “dpstelecom”).
If the connection attempt fails, proceed to the next step:
HyperTerminal
Create a new connection by entering the NetGuardian’s IP address and port number 2002.
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Unable to Telnet to NetGuardian
If the connection succeeds, enter a password (default password is “dpstelecom”) to log on.
If the Telnet connection fails and you do not see this message, proceed to the next step:
□Check that the PC has Ethernet IP connectivity to the NetGuardian by
pinging the NetGuardian’s IP address. (default = 192.168.1.1)
Ping the NetGuardian’s IP address
if the pings do not return, check the Ethernet connectivity for firewalls,
general hardware connections, and IP address settings. Also, ping the gateway to further test connectivity.
If the pings return successfully, proceed to the next step:
□Check the NetGaurdian IP address
◦The default IP address (192.168.1.1) most likely will not be compatible with your network
configuration.
◦Configure the NetGuardian IP address, subnet mask, and gateway for your network.
▪The best way to check or configure the NetGuardian’s IP address settings is to connect
through the front craft port:
▪Connect your laptop to the front DB9 of the NetGuardian. Use a serial-to-serial or USB-
to-serial cable.
▪Establish a connection in HyperTerminal (no handshaking, 9600 baud)
press Enter
Enter your password (default is “dpstelecom”)
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Unable to Telnet to NetGuardian
Press ‘C’ for Config, then ‘E’ for Edit, then ‘E’ for Ethernet
View/change the NetGuardian’s IP settings
The best way to configure the NetGuardian’s IP settings is by connecting through the front craft port
▪Alternatively, you can check and change settings in the NGEDIT software.
Click the ‘Ports’ tab to view/change the NetGuardian’s IP settings
Be sure to write the configuration file from your PC to the NetGuardian after making
any changes.
Alternatively you can view/edit IP settings in the ‘Ports’ tab of the NGEDIT software
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Unable to Telnet to NetGuardian
□Check for duplicate IP addresses.
First, Unplug the NetGuardian Ethernet port.
Ping the NetGuardian’s IP address again
If the pings continue to return without the Net Guardian plugged in, check for duplicate IP addresses on the
network.
If the pings are not returned with the NetGuardian unplugged, proceed to the next step:
□Connect directly with a crossover cable
◦Connect the test PC to the NetGuardian using an Ethernet crossover cable. (If you do not have a
crossover cable on hand, you can also use a simple hub or switch)
▪You may need to temporarily change the IP address of your PC to be directly on the
NetGuardian’s subnet.
◦If the PC can connect fine when directly connected, check the network firewall or network
connectivity.
◦If the PC cannot establish a connection even when directly connected, proceed to the next step:
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Unable to Telnet to NetGuardian
□Set the Windows XP firewall to ‘off’
◦Click Start → Settings → Control Panel → Windows Firewall
◦You may want to open a single port (2002) for Telnet alone, but fully disabling the Firewall may be
a more useful testing procedure in many cases.
◦If it is ‘on’, temporarily set the software Firewall to ‘off’:
Set the Windows XP firewall to ‘off’
NOTE: Disabling your firewall temporarily is a troubleshooting measure only and
not intended as a long-term solution for connection issues. DPS Telecom does not
recommend that you leave your firewall disabled for extended periods.
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If you continue having trouble please contact DPS Telecom tech support at (559) 454-1600 or [email protected].
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