MTU detection is the easiest one. Sucks for people with ISPs that don't do 1500 bytes but those are rare.
Isn‘t sub-1500 bytes the norm for residential internet access? (DOCSIS and DSL with PPPoE are the most common access protocols here in Germany)
looks at Japan, UK (OpenReach), and a lot of other places still using PPPoE (on fiber!) for complicated reasons
Hard disagree... there are still a vast many providers around the world doing < 1500, such as PPPoE DSL.
> but those are rare.
yeah sure, if you ignore the existence of literally every mobile isp.