[2025 Update]

[Guide] My New Router is Not Obtaining an IP Address from My Cable Modem

Setting up a new router should be a straightforward process, but many users encounter a frustrating issue: after connecting the router to their existing cable modem, the internet fails to work. The router’s internet light remains amber or red, and no websites load while your modem indicates that everything should be working.

This common problem is often caused by a networking phenomenon known as MAC Binding.

What Is MAC Binding?

MAC Binding (Media Access Control Binding) is when a cable modem retains the MAC address of the last device it was connected to—typically your previous router or computer. When a new device is connected, the modem does not recognize its MAC address and refuses to assign a public IP address from your Internet Service Provider (ISP). This is similar to trying to cash a check without proper identification: the modem cannot verify the new device, so it denies access.

How to Fix MAC Binding

Fortunately, resolving MAC Binding is simple and requires only a few steps. Follow this procedure to reset the modem and allow it to recognize your new router:

Option 1: Detailed Setup Process to Help the Modem Clear the Stored MAC Address

1. Power Down the Modem
   Unplug both the power cable and the coaxial cable from the back of your modem.
2. Connect the Router
   Use an Ethernet cable to connect your new router to the modem. Ensure the cable is plugged into the WAN port on the router.
3. Power On the Modem (Without Coaxial)
   Reconnect the power cable to the modem, but leave the coaxial cable disconnected. This allows the modem to reset its memory.
4. Wait 3–5 Minutes
   Give the modem time to flush its stored MAC address and prepare to accept a new one.
5. Reconnect the Coaxial Cable
   After the waiting period, plug the coaxial cable back into the modem.
6. Check Router Status
   Once the modem fully connects to the internet, check the internet light on your router. For TP-Link routers, a white, green, or blue light typically indicates a successful connection.
7. Test Your Internet Connection
   Open a browser and visit a few websites to confirm that your internet is working properly.

Option 2: Use the MAC Cloning Feature on Your TP-Link Router

If your router supports the feature, you can also use the MAC Cloning feature to make your new router use the MAC address of your previous router, or of a device you know works when connected directly to your modem. Learn How to do this

How do I configure MAC Address Clone on my TP-Link Archer Router?

Still Having Difficulties? Contact Your ISP First!
In rare cases, the modem may still refuse to release the old MAC address. If this happens, contact your ISP and request that they remotely clear the modem’s MAC binding.