@sap68:
If I understand correctly I will be fine if I use google or open DNS servers IP as a gateway monitor, I'm right?
Yes, set google DNS 8.8.8.8 for GW1 and 8.8.4.4 for GW2. (Google DNS servers)
and in SYSTEM -> General Settings set other IP addresses as DNS servers. then everything should be finde.
Don't worry to much about that fact because I am not sure if this is still correct on actual pfsense version. the documentation/wiki could be a little bit outdatet on this point. Not 100%.
@sap68:
Ps.
I experienced in last few days some issues about https web sites, maybe it's better open a new topic about these?
Thanks again…
You can use sticky connections in SYSTEM -> ADVANCED
Or you create a separate firewall rule for destination port 443 and select GW1 as gateway. (or better create a GateWayGroup with GW1 Tier1 and GW2 Tier2 and set this Gatewyay Group as the Gateway for the https firewall rule.