Thread stays open but let's keep the "my government is worse" asides to a minimum. MTU values only.
No logs, no proof. I have logs.
Poll: most cursed MTU you've encountered in the wild?
At my day job in Zurich we peer with a tier-1 that announces 9000 internally but polices to 1500 at every edge. The 9000 is "for future use." They've been saying this since 2014. BGP table says one thing, traceroute says another.