pfSense

Link to the discussion in question: https://forum.netgate.com/topic/180684/bug-in-default-gateway-selection

As described above:

Under the System menu, Routing, Gateways tab, Default gateway section.
In the fields:
Default gateway IPv4, and
Default gateway IPv6
set both = None. Save.
The message says:
"The gateway configuration has been changed.
The changes must be applied for them to take effect."
Click the Apply Changes button.
The globe icon still shows that the default gateway is WANGW. The same is shown in the dashboard.

The system continues working fine until a reboot, or until powering on the second server configured as backup (CARP/pfsync). After that, only LAN continues working, no internet access anymore (because WAN has no gateway).
It seems like an obvious question, but the fact of not stopping the internet access imediatly, it took me a lot of time to find out where the problem was. Two points here:
1 - it could have a better message after changing the default gateway field;
2 - it could apply the change immediatly, or print a message alerting the user about what will happen.

Thank you!