http://i3xi5qxvbrngh3g6o7czwjfxwjzigook7zxzjmgwg5b7xnjcn5hzciad.onion/proposals/348-udp-app-support.html
QUIC provides its own flexible connection lifetimes which may outlive individual network links or NAT mappings.
The intention is to provide transparent roaming as mobile users change networks.
This automated path discovery opens additional opportunities for malicious traffic, for which the RFC also offers mitigations.