ETR – ECMP traceroute

ETR is a MTR-like tool for discovering and analyzing ECMP (Equal-Cost Multi-Path) network routes.

ETR discovers multiple network paths by running parallel traceroute probes with different source ports, causing routers to select different ECMP routes. Each probe maintains a consistent 5-tuple (src IP, src port, dst IP, dst port, protocol) to repeatedly test the same path.

This is free and open source software.

Features include:

• Real-time TUI: MTR-like interface with live statistics (RTT, delay variation, packet loss per hop).
• Parallel probes: Run multiple simultaneous probes to discover different ECMP paths.
• Protocol support: TCP SYN and UDP probes (UDP payload length encodes probe details).
• JSON export: Stream results to stdout or file for analysis and integration.
• Path identification: CRC32 or SHA256 hashing to identify unique routes.
• Automatic destination detection: Stops probing beyond the final destination.

Website: github.com/tkjaer/etr
Support:
Developer: Thomas Kjær
License: MIT License

ETR is written in Go. Learn Go with our recommended free books and free tutorials.

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