How to Configure a Zyxel DX3301 ADSL Router to Work with Sky Broadband in the UK 


Last Updated on December 16, 2023 by GrahamWalsh

A step-by-step guide for setting up your Zyxel router with Sky’s broadband service valid as of December 2023.


If you have a Zyxel DX3301 ADSL router and you want to use it with Sky Broadband in the UK, you might encounter some difficulties. Sky uses a different protocol and authentication method than most other ISPs, which means that you need to adjust some settings on your router to make it compatible. In this blog post, we will show you how to do that in a few simple steps. 

The main reason I wanted to change the default Sky router is because I’m unable to change the default DNS servers on the Sky Router. In addition, with Zyxel, it gives me more control and I have Zyxel Access Points around the house too. I was about to send it back to Amazon, but then I decided to give it one more go. After reading so many posts on the Sky forums, no one had a concise answer as Sky users a MER protocol to connect.

What You Need 

Before you start, make sure you have the following items: 

  • Your Zyxel DX3301 ADSL router and its power adapter 
  • A microfilter and a phone cable 
  • A computer or a mobile device with a web browser 
  • Your existing Sky router MAC address (first 8 digits) 

You can find your Sky router MAC address on the back of the device. We’ll need it in hexadecimal format, so just 1A2B3C4D

Step 1: Connect Your Router to the Phone Line 

First, you need to connect your router to the phone line that Sky uses to deliver broadband to your home. To do that, follow these steps: 

  • Plug the microfilter into the phone socket on the wall. The microfilter is a small device that splits the phone signal into two: one for your phone and one for your broadband. 
  • Plug the phone cable into the DSL port on the microfilter. The DSL port is usually marked with a symbol that looks like this: undefined 
  • Plug the other end of the phone cable into the DSL port on the back of your router. The DSL port is usually marked with the same symbol as above. 
  • Plug the power adapter into the power socket on the back of your router and plug it into a power outlet. 
  • Turn on your router by pressing the power button on the back. 

Wait for a few minutes until the DSL light on the front of your router turns solid green. This means that your router has detected a DSL signal and is ready to connect to the internet. 

Step 2: Access Your Router’s Web Interface 

Next, you need to access your router’s web interface, which is a webpage that allows you to configure your router’s settings. To do that, follow these steps: 

  • Connect your computer or mobile device to your router’s Wi-Fi network. The network name (SSID) and password (key) are printed on a label on the bottom of your router. Alternatively, you can use an Ethernet cable to connect your computer to one of the LAN ports on the back of your router. 
  • Open a web browser and type in the address bar. This is the default IP address of your router. 
  • Enter admin as the username and 1234 as the password. These are the default login credentials of your router. If you have changed them before, use the ones you have set. 
  • Click Login or press Enter. You should see the Zyxel web interface, which looks something like this: undefined 

Step 3: Change Your Router’s Connection Mode 

Now, you need to change your router’s connection mode to match Sky’s protocol and authentication method. To do that, follow these steps: 

  • On the Zyxel web interface, click on Network Setting on the left menu. 
  • Click on Broadband. 
  • I decided to delete the 3 default entries here and create a new one called Sky.
  • On the Sky settings page, change the following options: 
  • Under General, set Type to VDSL over PTM, Mode to Routing, Encapsulation to IPoE, IP4/IP6 to IP4/IP6 Dual Stack.
  • Under VLAN, set 802.1p to 7 and 802.1q to 101 and the MTU to 1500
  • Under IP Address, set this to DHCP and select your own DNS services you wish to use. You can leave them to the default Sky ones, but I’ve selected Cloudflare and Google as my backup
  • Uder DHCP Options, this is where we need the router MAC address uder DHCP Option 61 IAID, this is where you enter the first 8 digits of your existing Sky Router MAC Address. Under Option 61 DUID, you need to enter 7c4ca5123456
  • Uder DHCP v6, I enabled obtain from here.

Your router will reboot and apply the new settings. Wait for a few minutes until the Internet light on the front of your router turns solid green. This means that your router has successfully connected to Sky Broadband and you can access the internet. 

Zyxel Config for Sky UK

And then you can check the the System Info


Congratulations! You have successfully configured your Zyxel DX3301 ADSL router to work with Sky Broadband in the UK. You can now enjoy the fast and reliable broadband service that Sky offers. If you have any questions or problems, you can contact Zyxel or Sky customer support for assistance. 

Also published on Medium.

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