HOW-TO: Use Ubiquiti Unifi UDM/USG directly with Vodafone Gigafast.

Information here is specific to my installation and configuration experience – your own mileage may vary!


I was fortunate/unfortunate enough depending on your point of view, to have the Vodafone Gigafast service installed. The underlying network is delivered by Cityfibre who are a growing player in the Fibre to the Premises (FTTP) market in the UK. As part of the installation, they provide a preconfigured router but as we all know, no-one sane uses the standard ISP kit – especially when you have a shiny UDM Pro sitting there so the ISP kit goes back in the box and on the shelf.

Unifi Equipment

UDM Pro running version 1.7.2 but should be a similar setup on most Unifi USG/UDM devices.


The Vodafone/Cityfibre router comes either preconfigured with the connection PPPoE credentials or is configured automagically. Either way, they don’t provide these details in any of the paperwork they send you. You must request the PPPoE details from Vodafone which is the most difficult part of the entire procedure! I found the easiest way to do this was through the Chat feature of the Vodafone website. You’ll need to pass through security so make sure you have your account number, email address associated with the account. They also asked me for part of the sort code associated with the direct debit. Tip: The username should be something like with a random string of text for the password.

Physical Configuration

When the nice installation engineer has finished, he will connect the WAN port of the ISP supplied router to a newly installed fibre termination box on the wall. Mine is a Calix device, black in colour and has four LEDs, a power plug, the optical input and an Ethernet port. As soon as the engineer is out of sight, disconnect the Ethernet cable from the WAN port on the ISP router and plug it in to the WAN port on your Unifi device. In my case, this is WAN on my UDM Pro.

Unifi Configuration

  • On the WAN configuration page of your Unifi Device (for classic, it’s Settings > Networks > WAN).
  • Enter a name for the Connection (default is WAN) in the Name field.
  • In the Connect Type drop down field under the IPV4 section, select PPPoE. A Username and Password field will appear.
  • Enter the Username and Password you obtained from Vodafone in the Prequisite section into these field.
  • In the DNS Server fields under Common Settings, enter your DNS servers of choice. I tend to stick with Cloudflare and but use whatever you will here.
  • Check the Use VLAN ID Checkbox and enter 911 in the box immediately to the right.
  • Make sure you are happy with the remaining settings.
  • Click Save and allow the changes to provision.


Once you have successfully established a connection, you can decide what to do with your ISP supplied router. Mine, as mentioned, is back in its box on the shelf but I’m sure you could have some fun setting fire to it, leaving it outdoors in the rain or using it as a doorstop.


And that’s it. This is written specifically for a specific ISP in a specific country but the key things are making sure you get your PPPoE credentials and also that the VLAN associated with Vodafone (at least in my part of the UK) is 911.

I hope this helps someone and good luck!

4 thoughts on “HOW-TO: Use Ubiquiti Unifi UDM/USG directly with Vodafone Gigafast.

  1. Hey, thanks for this article! I’m getting gigabit installed in the next few weeks and I saw this on Vodafone’s website.

    “If you choose to use your own router with our Gigafast service, you can’t use apps such as Skype, WhatsApp or Facetime to make calls over the internet – Voice Over Internet Protocol (VoIP).”

    I have a USG and am planning on contacting Vodafone to get my PPPoE info. But did you manage to overcome the issue above? Can you still use FaceTime, Skype, WhatsApp video etc etc?




    1. I’ve never had a problem with WhatsApp, Skype or VoIP when I’ve had the USG/UDM connected directly to the Vodafone/Cityfibre ONT (box on the wall).

      I don’t use Facetime so I can’t speak for that one.

      What I can say is that the router Vodaphone supply has an output on it to connect a regular “BT” style landline phone so if you do replace their router, you will lose that functionality. Never bothered me though because the only calls I ever got on the landline were accident claims people and scammers! 🙂


  2. I have just moved to gigafast and sadly cant get it working. got my log in details, they told me to use vlan 101 didnt work, tried vlan 911 as well but no luck, qos set to none and dns set to and , local area connects fine but no internet.
    Any ideas?


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