References

[1] TCP Handshake: https://en.wikipedia.org/wiki/ Transmission_Control_Protocol [2] pfSense firewall rule basics: https://doc.pfsense.org/ index.php/Firewall_Rule_Basics [3] Example of pfSense basic firewall rule: https://doc. pfsense.org/index.php/Example_basic_configuration [4] Note about FQDNs: https://doc.pfsense.org/index.php/ Using_FQDNs_in_Aliases [5] Forum link for allowing Gmail: https://forum.pfsense.org/ index.php?topic=101809.0

[6] URL Alias: https://forum.pfsense.org/index. php?topic=66499.0