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Interface without IP connection status

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I'm on Win7 and Qt and I need to track local network interfaces. The problem is - some of them don't have IP layer but I want to know if they are connected or not. I've tried

QNetworkInterface::allInterfaces() from Qt

and

GetInterfaceInfo() from iphlpapi.h

But both work only for interfaces with IP assigned. Duh. I've also tried

pcap library

But pcap_if_t has no fields to track connection status, only MAC and others. I feel stuck between two layers and don't know how to handle this. I suppose there is a way with WMI query but it seems to be an overkill.

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