Configure DHCP settings on your modem

Dynamic Host Configuration Protocol (DHCP) settings allow you to set the parameters for how your modem assigns IP addresses to devices on your network.

Proceed with caution!
CenturyLink recommends that you keep the default settings for the LAN IP Address. Changes to this feature will reset other settings on your modem as well. Proceed only if you understand the technical impacts of this feature.
If you need to restore the default CenturyLink IP addressing values, they are:
  • DHCP Server: Enable
  • Modem IP Address:
  • Beginning DHCP Server Address:
  • Ending DHCP Server Address:
  • Subnet mask:
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 Settings" 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 edit the settings:

  • Step 1:  Enable/Disable the DHCP server.
  • Step 2:  Enter the IP addressing values to be allocated.
  • Step 3:  Enter the DHCP server lease time.
  • Step 4:  Enable/Disable DHCP reservations.
  • Step 5:  Set the DNS type as Default or Custom.
  • Step 6:  Click "Apply" to save your changes.
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