RustNet — Monitors network connections per process in your terminal, with deep packet inspection.
Analyzed by Sai Pavan Gopularam · DevTools · Network Monitoring · View on GitHub
- Stars: 5039
- Forks: 235
- Commits last 30 days: 37
- Health: Active (37 commits this month)
- Language: Rust
- License: Apache-2.0
What It Is
Imagine a super-powered `netstat` or `ss` command that not only shows you every active network connection on your computer but also tells you exactly which application or even Kubernetes pod owns it. RustNet does this in real-time, right in your terminal, like a live dashboard for your network traffic.
This solves the problem of opaque network activity. Instead of guessing which app is sending data or struggling with complex packet sniffers, RustNet gives you immediate, clear answers, making it easier to diagnose network issues, identify suspicious activity, or simply understand how your applications use the internet.
License Verdict
Apache-2.0 License — Build and Sell Freely — Commercial Use Approved • Patents Granted • No Copyleft Restrictions
The Apache-2.0 license is highly permissive, allowing you to use, modify, and distribute the software for any purpose, including commercial applications. You can incorporate it into proprietary products without needing to open source your own code. It also grants patent licenses to contributors.
How to Use It
RustNet is a terminal-based network monitor. Installation is straightforward via package managers on most OS, or cargo. Running it requires elevated privileges for packet capture, but capabilities can be set for password-less execution on Linux.
Prerequisites:
- Homebrew (macOS/Linux)
- Npcap (Windows)
- sudo/admin privileges
Estimated setup time: 5 minutes.
brew install rustnet
sudo rustnet
# Linux: To run without sudo
sudo setcap 'cap_net_raw,cap_bpf,cap_perfmon+eip' $(which rustnet)
rustnetWhat I'd Build With This
Cloud Network Anomaly Detector for Devs (micro-saas)
A simple web service where developers can upload `pcapng` files generated by RustNet from their development or staging cloud instances. The service analyzes the network traffic, identifies processes, attributes to Kubernetes pods, and flags unusual connections or high-bandwidth usage, providing a quick, actionable report via email or a simple dashboard.
Effort: 1 Week Build Time · Target: Indie Developers, Small DevOps Teams · Pricing: $29/report or $79/month for unlimited reports
Kubernetes Network Observability Platform (saas)
A full SaaS offering that deploys RustNet agents as a DaemonSet within Kubernetes clusters. It provides a centralized dashboard to visualize network connections per pod/namespace, monitor traffic flows, detect network policy violations, and alert on suspicious activity. It offers deep packet inspection insights and historical data, becoming a critical tool for K8s network diagnostics and security.
Effort: 4 Months Build Time · Target: Kubernetes Platform Teams, SREs · Pricing: $199/month per cluster + usage
Endpoint & Cloud Security Telemetry Hub (enterprise)
An on-premise or private cloud solution for large enterprises to deploy RustNet agents across all endpoints (workstations, servers, cloud VMs, K8s nodes). This system aggregates process-attributed network telemetry, including deep packet inspection results and GeoIP data, feeding it into a central SIEM or data lake for advanced threat hunting, compliance auditing, and incident response.
Effort: 8 Months Build Time · Target: Enterprise Security Operations Centers (SOCs), Compliance Teams · Pricing: $10,000/year per 100 endpoints, custom pricing for K8s clusters
Sai Pavan Gopularam's Take
RustNet is a fantastic example of a highly practical Rust CLI tool. The per-process and Kubernetes pod attribution is a game-changer for debugging network issues or spotting suspicious activity, a feature often missing in simpler tools. I'd specifically target cloud/Kubernetes environments with this, offering a SaaS that monitors K8s clusters for unexpected network egress, charging around $500/month per cluster.
Watch Out For
- Requires elevated privileges: RustNet needs `sudo` or administrator rights to capture packets, which can be a hurdle for some users or in restricted environments. While Linux offers capability grants, it's an extra setup step.
- Terminal UI only: The primary interface is a Text User Interface (TUI), which is great for SSH and quick checks, but might not suit users who prefer graphical interfaces or extensive data visualization for long-term analysis.
- Performance overhead for very high traffic: While optimized, monitoring very high-volume network traffic on extremely busy servers might still incur some CPU overhead, especially with deep packet inspection enabled.
- eBPF/Platform Specifics: eBPF on Linux provides enhanced performance, but if unavailable or permissions are insufficient, it falls back to less efficient procfs-based monitoring. Different OSes use different underlying capture methods, which can have subtle implications.
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