FYI : IPv6 Prevented VPN Connection

Anvil_Iron · ‎07-07-2023

My wife uses VPN for work and one day she wasn't able to connect. I checked the router (Zyxel NR5103E) web-config and noticed the Primary/Secondary DNSv6 server addresses info were present which weren't before.

I tried disabling IPv6 in the WAN and LAN settings but internet service stopped.

I then enabled manual APN mode and changed from 3internet to Three.co.uk and restarted the router. After restart, the IPv6 info was N/A and the VPN was able to connect. VPN also connected when APN was set to 3internet with manual APN enabled.

The strange thing was when APN Manual Mode was disabled and router reset, IPv6 info was displayed. It looks like the router was obtaining IPv6 and IPv4 info from Three if manual APN mode is disabled. This could be the PDP Type being set to IPv4/IPv6 automatically by Three where as in manual APN mode, I have it set to IPv4 only.

NG · ‎07-17-2023

Update: Anvil_Iron is the man!!!

To add a little detail to help the more ignorant like me:

First, log in to the hub from a browser ideally on your laptop (or I guess phone), not the hub app. (ie, 192.168.1.1/login, logging in as admin)

1) under top-right burger menu-->Network Settings-->Broadband-->Cellular APN, I set to manual so it ended up as follows:

And under Burger menu-->Network Settings-->Home Networking-->Lan Setup, click on the 1st APN setting in the list (on the right-hand side where you click to edit), then

I then rebooted the hub, confirmed settings remained as above, and rebooted my devices (including network switch). Audio player and speaker when connected to my network switch do show up on hub app both under Wi-Fi and LAN as expected.

... AND I'M NOW LISTENING TO MY PINK FLOYD ALBUM ONCE AGAIN!!!!!

Thanks again Anvil_iron!!

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456 · ‎09-01-2023

Three really need to sort this out. Unacceptable. @JonathanB

jessicalouise · ‎08-28-2023

This helped to fix my connection with my Nintendo switch. I've been frustrated with it for weeks now. Thanks for the help!

CSmithyPx · ‎08-28-2023

I just created an account to say thank you so much! I went back to using my 5g CPE PRO which is way way slower and is almost unusable now for some reason.
But this allowed me to go back to the router I got with the contract. Life saver

dguru · ‎08-24-2023

Thanks @Anvil_Iron . It didnt work for me unfortunately..

456 · ‎08-22-2023

Ok, HUGE issues here as well. All of a sudden, half of my devices WOULD NOT CONNECT to the internet. It seems that the issues stems from the router starting to assign ipv6 addresses to all the connected devices, instead of ipv4.

I was able to get all the devices re-connected by following the instructions from this thread.

HOWEVER - my speeds have now dropped from 500+megs to 100megs. Is there a way for the router itself to use ipv6 to connect to Three but for all my home devices to use ipv4 to connect to the router? 🙏

NT · ‎08-13-2023

Thank you! This also fixed my Hitachi TV & Amazon Firestick connectibity issues with teh same router & firmware version as yours!

MarmiteLlama · ‎08-11-2023

Hi all,

Thank you so much @Anvil_Iron, as well as @JonathanB, and @Kevwelhamster.

The Three technical team ran me in circles getting a new router and new sim for this issue, declared their troubleshooting done, and did not solve anything. It is so unacceptable that they cannot offer any actual technical support and that the community are left to deal with issues that they cause with their systems.

JimJam · ‎08-05-2023

I had the same problem, y personal devices worked fine but unable to connect my work devices. I thought it was down to the time and date not being correct on the hub (and it would not update via the servers). I applied the above changes and work devices not working. Time has also updated on the hub 😉

JonathanB · ‎08-07-2023

Hey @JimJam,

Sorry not sure if there's a typo in your post. Are you saying that the devices are "not" working or "now" working after trying this?

Thanks,
Jonathan

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AndrewM · ‎07-24-2023

I can confirm this also worked for me - no need to change to IP6, just use the Three5GBroadband app to switch it over to Three.co.uk from 3internet. It’s also saved issues on my phone’s personal hotspot.