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Editorial Team
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Asked: 2026-05-28T08:16:16+00:00

I have multiple adapters just like default one, wifi-net, 3G card with usb etc

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I have multiple adapters just like default one, wifi-net, 3G card with usb etc in Windows.
How to determine which is the activity one? I tried to use GetAdaptersInfo/GetIfEntry but there is no answer. Could someone give me some suggest?

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  1. Editorial Team

    I’m not sure what you mean by “activity one”, so I’ll assume you mean “which network adapter is the default for reaching the internet”?

    Call GetIpForwardTable. Enumerate the MIB_IPFORWARDROW instances within the table. The rows with the dwForwardDest member set to zero are the default routes. In the event of more than one row with the dwForwardDest set to 0 (which can happen if you have more than one adpater), then use the dwForwardMetric1 member as the tie-breaker (lowest value wins).

    Once you find the default route row from GetIpForwardTable, you can use the dwForwardIfIndex member to identify which adapter in a call to GetIfTable is the default.

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