Troubleshooting LAN Connectivity

Follow these steps to troubleshoot a LAN connectivity issue.

In the order listed below, turn off and turn on the devices in your network.

Important: The order in which this is done is relevant and crucial to success.

1. Turn everything off. Start with the computers, then the router, and then the cable modem.
2. Leave everything turned off for 30 seconds.
3. Turn everything back on. Start with the cable modem, allowing it to sync.
4. Turn on the router.
5. Turn on the primary computer, and then turn on the remaining computers.

Generate a LAN IP address by disabling and enabling Dynamic Host Configuration Protocol (DHCP). See Generating a LAN IP Address for more information.

Verify the router is set up as a DHCP server.

Verify that all the wireless router settings related to SSID, WEP, and MAC level authentication are correct.

Important: If a network includes a Windows XP computer using a wireless connection, do not disable the SSID Broadcast feature on the router. Disabling the SSID can cause a loss of wireless connectivity to Windows XP. Verify the WEP and MAC address filtering security features are enabled.

On the wireless router, change channels.

Attempt a hard reset.

If there is still no connectivity, contact the router manufacturer.