SMC Networks SMC7004VBR V.2 - Manual (Page 52)

Troubleshooting
51
I have a Dynamic IP connection
and I can't get online
Most cable companies use a Dynamic IP configuration to provide
Internet access. If you have this type of connection, and are
unable to get connected, please follow the steps outlined below:
1. Unplug the power from your Cable or DSL modem for 2 mins.
2. Confirm that your Barricade™ router is configured for
a Dynamic IP configuration.
3. Plug the power back into your Modem.
4. Wait for your Modem to connect to the network, and then click
on the status page of the router to confirm that you are online.
The reason this process works is because certain broadband
connections require a MAC address to gain network access.
This MAC address can be changed by following the above
process to re-set the approved MAC address to the MAC
address of the Barricade™ router.