Product Info

Chapter 5: Troubleshooting Troubleshooting procedures
Page
5-7
NAT/DHCP-configured SM has lost or does not establish
connectivity
Before troubleshooting this problem, identify the NAT/DHCP configuration from the following list:
• NAT with DHCP Client (DHCP selected as the Connection Type of the WAN interface) and DHCP
Server
• NAT with DHCP Client (DHCP selected as the Connection Type of the WAN interface)
• NAT with DHCP Server
• NAT without DHCP
To troubleshoot a loss of connectivity for a SM configured for NAT/DHCP, perform the following steps.
Procedure 30 Troubleshooting loss of connectivity for NAT/DHCP-configured SM
1
Isolate the end user/SM from peripheral equipment and variables such as routers,
switches and firewalls.
2
Set up the minimal amount of equipment.
3
On each end of the link:
• Check the cables and connections.
• Verify that the cable/connection scheme—straight-through or crossover—is correct.
• Verify that the LED labeled LNK is green.
4
At the SM:
• Access the NAT Table tab in the Logs web page.
• Verify that the correct NAT translations are listed.
RESULT: NAT is eliminated as a possible cause if these translations are correct.
5
If this SM is configured for NAT with DHCP, then at the SM:
• Execute
ipconfig
(Windows) or
ifconfig
(Linux)
• Verify that the PC has an assigned IP address.
• If the PC does not have an assigned IP address, then
o enter ipconfig /release “Adapter Name”.
o enter ipconfig /renew “Adapter Name”.
o reboot the PC.
o after the PC has completed rebooting, execute
ipconfig
o if the PC has an assigned IP address, then
o access the NAT DHCP Statistics tab in the Statistics web page of the SM.
o
verify that DHCP is operating as configured.
6
After connectivity has been re-established, reinstall network elements and variables that
you removed in Step 1.