Focused, reliable, and purpose‑built utilities for networking, automation, and performance testing.
These are the tools I actively maintain and use in real‑world environments, grouped by area.
Browser‑based utilities — no install required.
A collection of ad‑free, browser‑based network utilities — My IP, Ping, Traceroute, DNS Lookup, Whois, Port Check, and Subnet Calc — all in one place, supervised by Nelly.
Open Network Tools tools.jeitler.cc →Smart‑Meter‑Auswertung: Viertelstundenwerte übersichtlich analysieren und visualisieren — als Web‑App und Website.
Open zaehlerblick.jeitler.cc →Command‑line tools for measuring, testing, and monitoring network performance.
Eping(a).py is a powerful tool that uses FPing and Python to test the network connectivity of thousands of hosts efficiently and in parallel, with built‑in logging and analysis capabilities.
View on GitHub →Bidirectional Path MTU diagnostics over raw ICMP that measures forward and reply MTU separately and detects PMTUD black holes.
View on GitHub →A UDP traffic generator and receiver with multi-stream support, one-way delay, loss and DSCP measurement for validating QoS, latency and links. TUI and web GUI.
View on GitHub →Real‑time DSCP traffic analyzer for network interfaces — like top, but for QoS markings.
View on GitHub →WAN Simulation made easy - transparent L2 WAN emulator on tc netem: delay, jitter, loss, rate, MTU per direction. TUI + web GUI, live graphs. Linux / Raspberry Pi.
View on GitHub →Fast, root-free host reachability & path-MTU (PMTUD) scanner for large IP ranges. Zero dependencies.
View on GitHub →A Tmux‑centric framework that supports network measurements by orchestrating iPerf3, Ping, FPing, and other tools in parallel, providing multi‑pane views and logging.
View on GitHub →A straightforward, dialog‑driven CLI menu for managing network settings, focused on wired connections.
View on GitHub →Checks USB Ethernet adapters and broadcasts a warning to all active terminal sessions if an adapter is running in USB 2.0 mode.
View on GitHub →A collection of small tools that came up while solving real‑world problems.
View on GitHub →Utilities that extend and automate Cisco IOS‑XE Guestshell environments.
Bootstrapping and provisioning tools.
Keeping DNS records in sync with dynamic IPs.
I'm Ewald Jeitler, a systems engineer with over two decades of experience and a Distinguished Senior Systems Engineer at NTS Netzwerk Telekom Service AG. I also hold a CCIE Enterprise Infrastructure certification (#27300).
All tools on this site are personal hobby projects that I build in my spare time, supervised — occasionally inspected, mostly napped through — by my cat Nelly
. They reflect my curiosity, my passion for clean engineering, and my desire to create practical solutions for the networking and automation community. I hope everyone who uses these tools has fun exploring them and finds them as helpful as I do.