Mastering Ligolo-ng: The Ultimate Guide to Advanced Network Tunneling

When it comes to network pivoting during penetration testing or red team engagements, the industry standard has long been SSH port forwarding combined with proxychains, or tools like Chisel. While these tools are reliable, they are often slow, clunky, and notoriously unstable when routing massive nmap scans.

Enter Ligolo-ng: an advanced, yet beautifully simple, tunneling tool that completely eliminates the need for SOCKS proxies. Instead, Ligolo-ng creates a virtual userland TUN interface on your attack machine, allowing you to route traffic through a compromised host natively.

In this deep dive, we will explore exactly how Ligolo-ng works under the hood, how to install it, and step-by-step usage scenarios for your next engagement.

Why Ligolo-ng is a Game Changer

Traditional pivoting tools wrap your network requests in a SOCKS proxy protocol. This introduces significant overhead and breaks tools that require raw sockets (like nmap SYN scans).

Ligolo-ng solves this by leveraging a TUN interface and a user-mode network stack based on Google's gVisor.

Key Advantages:

1. No Proxychains Required: Because your attacker machine natively understands the route to the internal network via the TUN interface, you can run tools like nmap, netexec, and smbclient directly from your terminal.
2. Speed and Stability: The gVisor network stack is incredibly efficient. You can run full port scans through the tunnel without dropping packets or crashing the agent.
3. Low Privilege Execution: Establishing the tunnel does not require root or administrative privileges on the target (agent) machine.

Step 1: Setting up the Proxy Server (Attacker Machine)

Ligolo-ng operates on a Client/Server architecture, but the naming convention is slightly different. The "Proxy" runs on your attacker machine, and the "Agent" runs on the compromised target.