Xs4all (fiber) configuration working with 19.1.x, no internet on lan with 20.1.2

[Rayman]

Hi all,

Appliance: A10
Xs4all config:
Internet on VLAN6, IPTV on VLAN4.

I've used OPNsense until about July last year (I'll explain later why). Now, I did restore the configuration of last July on a fresh (serial) install on my A10.

If I do this, I don't have internet on the LAN interface, however, I can ping, from the A10, on the WAN interface to the internet.

If I disable the WAN_IPTV (Vlan 4) interface, internet starts working again, also from the LAN interface. Of course, I loose the IPTV. When I re-enable the WAN_IPTV interface, it breaks the internet on the LAN interface again.

Outbound NAT is set to automatic.

I have no manual routes configured.

Does anyone have an idea why the same configuration would cause no internet connection on LAN on 20.1?

If anyone has a suggestion, I'm going to try that. However, I must first do a serial install of 20.1, and restore the config to test. If it's not working, I have to serial install 19.1 again.

Also (but not important), an upgrade from 19.1 to 10.7 causes a bootloop in the A10 device.

Finally If anyone is interested. Last July I did get problems with internet disconnecting from time to time. I started using the Xs4all (Fritsbox) router to solve it. It turned out that a cable under the floor had a bad connection, so it was never a problem of OPNsense.

That's all for now.

I really hope someone can help.

Thanks,
Raymond