Configure GL.iNet GL-BE9300 (Flint 3) on KPN fiber

• Published: 17 March 2026

Backstory

Up until a few days ago my main Wi-Fi router was an Apple Time Capsule. It's one of the latest models but still this thing is old. Apple discontinued the product line in 2018 but I probably bought it in 2013, maybe 2014. That makes it over 10 years old. It survived 3 NYC apartments, a move back to The Netherlands, being stored in an attic for a while, dusted off and then 2 more houses. The longevity of this thing is honestly amazing (granted I haven't used it for backups for a few years but when I stopped even the hard drive still worked).

I didn't even replace it because it was broken but because I need more configurability for my work at IPinfo. To test I occasionally need uncommon network configurations like an IPv6-only network, an open Wi-Fi network or just a separate Wi-Fi network to begin with. None of these were easy to set up on my Time Capsule or the router that came for free with my KPN subscription.

UniFi vs GL.iNet

For years I thought I would upgrade to UniFi but I decided against it. The fact that it's an American company didn't work in its favor but ultimately I realized I didn't need their ecosystem. I run Home Assistant so anything I can get through their ecosystem I can also connect to my current network and have Home Assistant handle it.

Instead I went for a Flint 3 (GL-BE9300). It was recommended by a coworker, it's well reviewed by rthings.com but most importantly it runs a modified OpenWrt firmware. I don't have to set up OpenWrt from scratch but I can still use it to configure unusual network configurations.

KPN setup

After I received my new router I needed to make it work on my KPN Fiber connection. Initially I followed this guide. In case the guide ever disappears here's a quick summary of its setup:

Under “Ethernet 1” click “Modify” then use the following settings:

Then click “Apply”

IPv6 support

The guide worked, but left me without IPv6 support. After some digging I found it's something I need to enable by going to “Network” -> “IPv6” and then enable it with the following settings:

Finally go to “Network” -> “Multi-WAN”, Click the settings gear next to “Ethernet 1” and change “Protocol” from “IPv4” to “Both”

That's it. A quick way to test if it worked is to see if v6.ipinfo.io loads. Next I'm going to set up an open but encrypted (OWE) Wi-Fi network for testing.