NM reports a gsm connection's device as the control port (cdc-wdm0), but IP + routes live on the wwan netdev (wwu1u2i4 on the Quectel EC25-AF), so probes and route enforcement silently saw nothing (cellular stuck "down", no metric). Map connection-keyed WANs through GENERAL.IP-IFACE, and let the gateway fallback query the connection since the netdev isn't an NM device. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>