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TL;DR: mwan3 reroutes new flows when an uplink dies. Existing flows stay pinned to the dead path — conntrack remembers, the firewall flow offload keeps shovelling packets along it, and long-lived TCP sockets linger until their application notices and reconnects. The native flush_conntrack option is a global nuke. The fix is a fifteen-line /etc/mwan3.user that does a selective conntrack flush by…
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