- The WAND network research group provides a set of PMTUD Tests. See also this guide to interpreting the test results. For background, consult this presentation
- The web server at http://www.ipv6chicken.com uses a large MTU on its own interface to provide a quick test of PMTUD operation in the path from them to your local network.
Test support of Extension Headers
- The path6 tool of SI6 Networks' IPv6 Toolkit is an IPv6-enabled traceroute-like tool with full support for IPv6 Extension Headers.
If you host a website and want to test your end users' IPv6 access: