Set up DHCP reservations on your modem

The DHCP reservation setup assigns a permanent IP address from your DHCP to a device on your network. 
If you are having trouble connecting new devices to your modem, you can go to step 7 below to disable DHCP reservations and remove all devices from the reservation list.
NOTE:  This article applies to newer CenturyLink modems. Depending on your particular model, you may see slight differences in the features or layout of your modem's user interface.
Modem Advanced Step 1-4

1.  Connect a device, such as a computer or tablet, to the internet through WiFi or using an Ethernet cable connected to your modem.

2.  Open a web browser and type into the web address field.

3.  Log in to the modem's online user interface (Modem GUI) using your Administrator Username and Administrator Password. Unless you have changed the default settings, you can find this information on the modem's sticker. Note that these are different from your wireless SSID and security key.

4.  Select "Advanced Setup."

5.  Select "DHCP Reservation" in the left sidebar. This menu option may appear in the LAN Settings section or in the IP Addressing section, depending on your model. 

6.  Follow the steps to enable DHCP reservations:

  • Step 1:  Enable the DHCP reservation state.
  • Step 2:  Enable/Disable automatic reservations upon allocation of IP addresses.
  • Step 3:  Enter the beginning and ending IP for the DHCP reservation address pool.
  • Step 4:  Select or manually enter the MAC address of the device(s).
  • Step 5:  Set the IP address to be associated with the chosen device (MAC). 
  • Step 6:  Click "Apply" to save your changes.
Note:  If you are having trouble connecting new devices to your modem, follow Step 7 below to disable DHCP reservations.

7.  Follow the steps to disable DHCP reservations:

  • Step 1:  Disable the DHCP reservation state.
  • Step 2:  Remove all devices from the list at the bottom.
  • Step 3:  Click "Apply" to save your changes.
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