When QUIC's Connection Migration Meets Middleboxes A case study on mobile Wi-Fi hotspot

QUIC's connection migration provides an opportunity for network middleboxes to control paths of network traffic in a fine time granularity without worrying about breaking down the transport layer connections. This paper takes the first step to investigate its feasibility and effectiveness. We apply connection migration to a multi-carrier Wi-Fi relay to counter the latency caused by cellular network suspension. We identify a deadlock in such a situation, which eliminates the gain of passive migration. We analyze the root cause and propose a simple but effective approach to resolve the deadlock. Our findings may also motivate similar applications in other middlebox scenarios.