QUIC

QUIC Connection IDs Keep Sessions Across Address Changes

A network connection is often associated with addresses and ports. That works well while both endpoints keep the same network attachment, but mobile devices regularly move between Wi-Fi and cellular service, and NAT devices can replace an external UDP port while an application is still active. QUIC provides another identifier for the transport connection: the connection ID. A non-zero-length connection ID lets an endpoint associate incoming QUIC packets with existing connection state even when the packet arrives from a different IP address or UDP port.