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Assumptions:You can successfully connect to the Internet without the router by connecting your computer directly to the modem (sometimes requiring a special "crossover" cable). If you have a wireless connection, this assumes that the problem is the same whether wired or wireless. Your router and computer are configured to automatically receive IP assignment information through DHCP (usually true by default). Your router is configured with an enabled DHCP server that gives IP addresses to the computers that connect with it (usually true by default).
1. Unplug power to your broadband modem. Unplug power to your router.
2. Shut down your network computers.
3. Check that your devices are connected to the right ports of each device. Wall-to-modem, modem-to-router(WAN port), router(LAN port)-to-computer.
4. Wait for about 20-30 seconds for the modem's circuits to completely discharge before restoring power to the modem.
5. Wait for another 20-30 seconds. This wait allows time for the broadband modem to resynchronize with the network. When you see the lights become stable, and the DSL or Cable light indicates a proper connection, plug in the router.
6. Wait for another 20-30 seconds. This wait allows time for the router to negotiate port speeds and synchronize with the broadband modem. When you see the lights begin to flicker randomly (indicating network traffic), and a light indicating your WAN port is connected, turn on your network computers.
7. After your computers reboot, log in. Wait for 20-30 seconds after your personal settings have finished loaded. This wait allows your computers to automatically receive a renewed or updated IP address, Gateway, and DNS assignment through DHCP.
Notes: If the trouble returns or persists:
A. Your ISP may require that the router's ISP-facing MAC address be registered to your account. Some routers have a setting to use a different MAC address to the WAN port. You can use the MAC address of a device that was previously plugged into the modem (often called "Cloning the MAC"). Or you can call your ISP and give them the MAC address of your router.
B. Consider the possibility that the cable or the ports between the router and broadband modem is defective.
C. If you have a DSL modem, consider putting your DSL modem into Bridge mode -- or, on the modem, choose the option to deliver your IP address to the computer. Visit the support site for your modem's manufacturer or visit the appropriate Equipment Support or ISP forum. As this is a common procedure, searching the posts and FAQs is likely to find your answer.
D. The provider of your modem, router, or ISP service may have additional settings or tips to help you. See the links above.
E. The person who set up your modem may have added firewall rules or filters that are preventing the connection.
F. If this is a brand new product, it may simply have a manufacturing defect that cannot be corrected by the consumer. To be sure, contact technical support for the manufacturer of the product, or if it was provided by your ISP, contact your ISP.