If the AmpliFi router displays a "No IP Address" error please perform the following steps to resolve the issue. This article will also help with IPv4 errors. IPv4 is a protocol that allows a network to identify a device and its location in the network. When AmpliFi is not being assigned an IP address it is unable to communicate with the modem and will probably show a No IP Address message on the router LCD screen.
Tip A new cable should be used during troubleshooting to ensure the original cable was not the culprit.
1. Leaving the Ethernet cable plugged in between the two components (AmpliFi router and modem), power them both off completely. Unplugging them from their power supply is a good method.
2. Once they are both powered off, plug only the AmpliFi router into power. Allow the AmpliFi to fully reboot before proceeding to Step 3. You'll know the AmpliFi router is fully booted when the message "Plug in Cable" appears on its LCD screen.
3. Power up the modem next. Please give the modem up to five minutes to fully reboot. Check if the message is still present before continuing to the next step.
4. If the issue persists, verify that the modem or modem/router combo used along with the AmpliFi router is in bridge mode. This can be done by checking the modem settings or contacting your service provider. If the modem is operating in DHCP mode, then enable bridge mode on the AmpliFi router via the app. The important point here is that if you have two routers in your network: your AmpliFi router and a modem/router combo provided by your ISP, one of those two need to be in bridge mode.
5. Contact your internet service provider and ensure that you have a connection to the internet. That there are no outages in your area or that you have not had your service suspended for some reason. You can also let your provider know you are adding a router to your network, and determine if there is any action on their side that should be performed for the configuration to work.
6. Check the WAN connection type. To do so, launch the AmpliFi app. Select the AmpliFi router icon, and then select Internet under the settings subhead. Check that the Network Type is correct, your service provider can recommend the best Network Type for the service they are providing you.
7. If the AmpliFi router is replacing a router that was already in your network, try to clone the MAC address of the router being replaced. Launch the AmpliFi app and select the router icon, select the Internet option. Under the Other subhead toggle on "Clone MAC Address" and enter the old router's MAC Address. If you don't know what it is, search in your old router's support documentation to find out where/how you can view the MAC ID.
8. If you have fully performed all of these steps and the issue persists, try performing a factory reset of the AmpliFi router.