There is a similar question already answered about Balance Ihttps://forum.peplink.com/t/balance-one-default-inbound-firewall-rule-allow-any/6368 ), I am sorry, I do not understand the answer well enough to know if it applies to MAX. Basically, most routers and firewalls - at least the few I have used - have a default inbound rule that DENIES all traffic. But my MAX, like the Balance, comes out of the box, with what looks like a wide open default. If there is a reason, like the Balance, why inbound rules only apply to certain types of traffic, I could find no mention in the Max user manual.
Thanks for clearing this up.