Question

How to identify connectivity status of a specific NetworkInterface ?

        NetworkInterface[] nets = NetworkInterface.GetAllNetworkInterfaces();

        foreach (var n in nets)
        {
            // TODO: determine connectivity status of each network interface
            // ( mainly interested in IPv4 connectivity )
        }

• This question is not about general internet connectivity and as such using say GetIsNetworkAvailable() is not a solution
• OperationalStatus.Up can be used to filter out some inactive network interfaces, but not all – OperationalStatus.Up leaves in some interfaces that show “No network access” for both IPv4 and IPv6
• I’m also aware how to get the IPv4 UnicastAddresses, but then what / is that useful?
• I could not find anything relevant in these sections of WMI

i.e. extracting per interface status as Internet, Local, Limited or None

Answer 1

I think the Microsoft dialog you show above is using information gained by coding against the Network Location Awareness API.

http://msdn.microsoft.com/en-us/library/ee264321%28v=VS.85%29.aspx