A network tool for bandwidth shaping and traffic management on local networks, written in Rust.
harper sits between devices on your network and the internet, giving you control over who gets how much bandwidth. It can throttle a connection to a specific speed, block it entirely, or leave it untouched on a per-device basis.
It operates in two modes:
- MITM mode harper positions itself between a target device and the gateway using ARP spoofing, without needing to be the actual router.
- Gateway mode If you are the router or hotspot, harper shapes traffic directly without any ARP manipulation.
- Linux
- Root privileges
- A wired or wireless network interface
This software is provided for educational and research purposes only. You are solely responsible for ensuring your use complies with all applicable laws. Only use harper on networks you own or have explicit written permission to test.
See LICENSE for the full MIT license terms.
Also a statement from the author exist in Legal Notice
MIT © 2026 Masrkai