Menu
. This update transitioned from beta to stable in early 2023 and includes critical fixes and feature enhancements for network simulation. Upgrade Instructions
Warren Buffet: Where to Store Your Cash If Banks Fail — The 1929 Strategy Nobody Is Teaching. Elite Boardroom•139K views. YouTube·The Linux Cafe Release - PNETLab : Lab is Simple
The brings several quality-of-life improvements aimed at making topology design and lab management more intuitive: GUI Topology Editor Enhancements :
Added a custom icon for NAT cloud nodes, improving the visual clarity of network boundaries. How to Upgrade to PNETLab 5.3.11
: Features for designing, sharing, and managing complex network topologies. Pnetlab 5.3.11
: Resolved a bug where pictures within a lab failed to load correctly.
If the instance resides in an air-gapped environment or lacks high-speed repository access, you can manually apply the patch via the official PNETLab Releases Portal .
Add new devices by creating .yml files in /opt/unetlab/html/templates/ . Example for Arista vEOS:
| Problem | Solution | |---------|----------| | Nodes stuck at 0% CPU | Run systemctl restart pnetlab or unl_wrapper -a fixpermissions | | Console not opening | Check browser popup blocker; ensure telnet client installed on host | | “Image not found” | Place images in /opt/unetlab/addons/iol/bin/ or /qemu/ and run fixpermissions | | High RAM usage | Use IOL instead of QEMU where possible; enable “idlepc” for Dynamips | Elite Boardroom•139K views
PNETLab 5.3.11 represents a functional network emulation platform with support for multiple vendors and convenient web-based management. However, the presence of multiple security vulnerabilities (CVE-2025-63749, CVE-2024-51111, CVE-2024-51112), combined with the platform's deprecated status and lack of active maintenance, make it a risky choice for production or sensitive training environments.
Upgrading an active instance from a legacy version to the stable 5.3.11 patch can be achieved through two primary mechanisms: the command line manual approach or the automated repository engine. Method 1: Manual Patch Upgrade via SFTP
Its focus on "making labs simple"—as stated in their motto—means less time fighting with the emulation platform and more time learning the networking technologies. Conclusion
: This enables Remote Command Execution (RCE), letting attackers run arbitrary commands directly inside the underlying Linux host OS. 2. Cross-Site Scripting (CVE-2024-51111) Security Bulletin 08_January_2025 : Resolved a bug where pictures within a
This update resolves issues where nodes connected to internal or private clouds failed to capture traffic, essential for troubleshooting.
: The ishare2 script is a popular way to download and manage images directly from the PNETLab CLI.
PNETLab (Packet Network Emulator Tool Lab) is a browser-based platform for creating and simulating computer networks. It runs real device images (like Cisco routers or firewalls) using KVM/QEMU, allowing users to build topologies without any physical hardware.