Rianda Pratama. A Literature Review : Network Security Menggunakan Virtual Private Network L2tp/Ipsec, Port Knocking, Port Forwarding, Honeypot Dan Pfsense. JJKK [Internet]. 2023Oct.20 [cited 2023Mar.2];4(3):11-8. Available from: https://iitss.or.id/ojs/index.php/jjkk/article/view/61