Thanks for the reply.
I have managed to get the messages to stop.
From reading Excessive data usage MAX BR1 mini - Confirmed - #33 by Jonathan_Pitts
" Outbound policies, set default (at bottom ) to custom, enforced to either wan or cellular only"
I changed this default to Custom > enforced > WAN 2 port.
Changing this stopped all the 8.8.8.8 requests.
I’ve never even noticed that default setting being clickable in 4 years lol.
The odd thing is that I already have every vlan/subnet set to be enforced to a WAN port.
Eg guest vlan enforced to WAN 1 into a port on upstream router. All traffic on this port is directed out without VPN
Another subnet enforced to go out WAN 2 into a different port on opnsense and directed out through a VPN.
So with that default setting changed, I was able to roll back some of the other recommended settings. Such as WAN health check settings. For me at least, the health check settings were not causing the Balance One to send 8.8.8.8 requests.
And it is/was definitely originating from the Balance One.
Wifi is disabled completely, theres no cellular and there’s only 3 connected devices right now while I get things set up.
- opnsense router (which rejects the incoming 8.8.8.8 requests when not blocked at the B One)
- Balance One router (which I had blocking the outgoing 8.8.8.8 requests from it’s WAN 1 & 2 static IPs)
- a management device which is only wired (no wifi bluetooth etc) and is ruled to only allow communication to the B One on my specified web admin port and block everything else and those are higher priority rules than the block 8.8.8.8 rule.
Thanks again for your reply