An visual tunnel MTU/MSS calculator in pure client-side HTML/JS.
Tunnel MTU/MSS calculation is a common task. Calculating it is a common task, and many beginners find it confusing. This project tries to make it easy to do and understand what's going on.
To run it locally, just clone the repo and point your browser to the index.html file.
A live version is available at https://baturin.org/tools/encapcalc/