The IETF has specs for IP-over-HTTP/3 (MASQUE CONNECT-IP, RFC 9484)
and Multipath QUIC, but no open-source implementation combines both.
I implemented MASQUE CONNECT-IP on XQUIC (which already had Multipath QUIC),
and wrote a new multipath scheduler designed for QUIC Datagrams, then built a VPN layer on that.This scheduler (WLB) distributes TCP flows across paths proportional to
capacity — with asymmetric paths, it reaches 319 Mbps (84% of theoretical max), +21% over the default MinRTT scheduler at 16 parallel flows. Failover is zero downtime.
Benchmarks and graphs in docs/benchmarks_netns.md.