How To Clear MAC Lock - TekSavvy Community

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Introduction

In an effort to conserve IPv4 addresses, cable providers generally limit the number of unique IP addresses that they will assign through an individual modem. DHCP uses a devices MAC address to determine if it has given an IP address lease to that device.

When the maximum number of allowed devices is reached the modem will become MAC locked and will refuse to assign an IP address to the new device. The instructions listed below will help you to clear MAC lock from a customer's cable modem by attempting to release an IP lease from the DHCP server.

Instructions

Windows

On the computer that is currently functioning, open a Command Prompt window. (Small Black Window)
- Windows Key + R (Opens a RUN window)
- Enter CMD
With the command prompt window open, type in ipconfig /release
Disconnect the power to your cable modem.
Disconnect the Coaxial Cable from your modem.
Disconnect your PC from the modem.
Connect the device you wish to have access to the internet.
Wait 5 minutes
Reconnect the power to the cable modem
Wait 1 minute
Reconnect the Coaxial cable
Wait for the modem to synchronize
Customer should now be able to surf!

Mac

On the computer that is currently functioning, open up System Preferences
Click and open Network
Click and open Ethernet
Click on Advanced (Bottom right hand corner of the window)
Click on Renew DHCP Lease
Disconnect the power to your cable modem.
Disconnect the Coaxial Cable from your modem.
Disconnect your PC from the modem.
Connect the device you wish to have access to the internet.
Wait 5 minutes
Reconnect the power to the cable modem
Wait 1 minute
Reconnect the Coaxial cable
Wait for the modem to synchronize
Customer should now be able to surf!

Router

Disconnect the power to your cable modem.
Disconnect the Coaxial Cable from your modem.
Disconnect the power to your router.
Wait 5 minutes
Reconnect the power to the cable modem
Wait 1 minute
Reconnect the Coaxial cable
Wait for the modem to synchronize
Power on the router
Customer should now be able to surf!