I'm new to Opnsense (coming from Untangle). I've got my MaxMind stuff setup.
I create my Alias Type (GeoIP) and select US only, then in the Firewall Rule make it an Allow Rule. Would this rule allow IP's only from the US (blocking all others)?
That depends on the rules that follow. Rules are processed in order and by default OPNsense comes with a rule allowing everything from LAN out to the Internet.
Thanks for the help and insight.
A simple block all/remaining after, should do it.