This rule is saying that anything in the LAN network can ping anything in the Guest network. Obviously change to fit your needs. Also if you want to go the oppisite direction create a similar rule from the guest interface (In this case).
[xMAXIMUSx] thanks for the assist! I tried that and put a rule on both sides and I could not ping from device to device. Does anyone know what I’m missing?
Are you sure the endpoint you are trying to ping doesn’t have any OS firewall rules that are blocking ICMP? Meaning the Device itself is blocking ICMP.