When I add ICMP to be allowed both on inside / outside interfaces the internet connection dies. Does anyone know why this happens?
I kind of observed that this behavior takes place not just for ICMP.
When there are no ACLs on an interface, the relative security-levels of the interfaces involved determine access, i.e. if the ingress interface has security-level 50 and the egress interface has security-level 10, you are always granted access.
Adding ANY access rules to an interface switches the default rule to
Confusing? You betcha.