Here’s an interesting tidbit from the what took them so long department: Cloudflare One Client continuously measures end-to-end MTU and adjusts the local tunnel interface MTU size accordingly (warning: there’s a fair amount of dubious handwaving over the interesting details), generating ICMP packet-too-big messages as close to the source as possible.

I managed to avoid VPN clients most of my life, so I have no idea whether this is a “finally someone figured that out 🎉” moment or a late catch-up to what other VPN clients have been doing for ages. Feedback (in comments or otherwise) would be most welcome!