UI Support (Ubiquiti Help Center)
Sep 18, 2024, 08:52 MDT
Hi Jan,
I'm Nathan from the UniFi Routing & Switching team and I'll be assisting you with your request.
Some ISPs restrict connectivity to certain MAC addresses. You may need to clone your modem or router’s MAC address in order to set up your UCG-Ultra. We recommend contacting your ISP first to confirm whether or not this is necessary.
If that is not necessary, then please follow the below steps to set up the UCG-Ultra:
- Plug the Fiber modem into the WAN port of the AVM Fritzbox
- Configure the AVM Fritzbox in the router mode with DHCP enabled on its LAN network. Make sure the IP range of the UCG-Ultra and AVM Fritzbox does not match
- Plug the UCG-Ultra into one of the LAN ports of the AVM Fritzbox
- Select IPv4 connection type as DHCP while setting up the UCG-Ultra
- Once setup is completed, select IPv4 connection type as DS-Lite under settings of the WAN network of the UCG-Ultra
- Then remove the AVM Fritzbox from the network and plug the Fiber modem directly into the WAN port of the UCG-Ultra.
Then check if you're able to access the internet through the UCG-Ultra.
If the issue persists then download a new copy of the support file by following the steps in this article. Then send it as an attachment here: https://help.ui.com/requests/4328503.
Also, provide us with the IP address a computer gets via DHCP when plugged directly into the Fiber modem and if you're able to access the internet on that computer.
Best,
UI Support
Ubiquiti Inc.