http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/proposals/348-udp-app-support.html
This works for some types of UDP applications, but it's broken by common behaviors like ICE connectivity checks, NAT traversal attempts, or using multiple servers via the same socket. No additional large-message fragmentation protocol is defined, so the MTU in proposal 100 is limited to what fits in a single Tor cell.