Performance measurements

Some useful ways to measure network performance for all kinds of reasons.

Connectivity

• ping — does what it says on the tin.
  • Make sure the target responds to ICMP requests. If these are firewalled off, you may think you can’t reach a target but actually can.
• traceroute — see where along the pipeline a connection to a target is dropped. Can be finnicky.

Performance

• iperf — server/client speed test and bandwidth measurement
  • Server side: sudo iperf3 -s -p <port>
    • Ensure port is open on the firewall
  • Client side: sudo iperf3 -c example.com -p <port>
• https://test.libreqos.com/ — free bufferbloat test & under-load performance info
• https://github.com/nitred/nr-wg-mtu-finder — Wireguard MTU optimizer (“brute-force tester”)

See also

• Wireguard performance tuning notes: https://www.procustodibus.com/blog/2022/12/wireguard-performance-tuning/