If you’re a fan or not of port knocking, single packet authorization is along the same lines, and has a much more robust mechanism that addresses most of the cr

If you’re a fan or not of port knocking, single packet authorization is along the same lines, and has a much more robust mechanism that addresses most of the criticisms of port knocking. Your packet is cryptographically signed. Take a look at fwknop for the implementation. The only issue with it is there’s no easy install for pfsense.