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The custom 14789 was picked to keep our demux socket off the ports other VXLAN software listens on, but a private default surprises operators and blocks interop with gear that pins the standard port. Default to the IANA-assigned 4789 instead; the gns3_server.conf override is unchanged for computes where swarm overlay/flannel-style VXLAN already owns 4789. Mixed-version deployments must pin the port on every compute until they all run the new default, or the two tunnel ends will disagree.