Foundations of VPNs: Architecture, Tunneling, and Security Mechanisms

Virtual Private Networks, or VPNs, have become indispensable in today’s interconnected digital landscape. They serve as the linchpin that enables remote users to securely access corporate networks via the public Internet. The fundamental purpose of a VPN is to create a secure, encrypted connection—often called a tunnel—between a remote device and an organization’s internal network.… Read More »

Silent Bridges: Firewall Evasion with SSH and PuTTY Tunneling

An SSH tunnel can provide a useful, encrypted route to an administrative service that should not be exposed directly to the internet. But its purpose is not to make a firewall decision disappear. A tunnel changes where a connection enters a network, who can initiate it and which host opens the connection at the other… Read More »

CISSP Prep: In-Depth Guide to Layer 2 Tunneling Protocol

Layer 2 Tunneling Protocol (L2TP) is a widely used tunneling protocol designed to support virtual private networks (VPNs) or as part of the delivery of services by ISPs. As a key technology in network security, especially for those preparing for the CISSP certification, understanding L2TP’s fundamentals is critical. This part explores the basics of L2TP,… Read More »