NAT/DHCP-configured SM has lost or does not establish connectivity

Products PMP
1

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.

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.