Auto-Choose Internet Network Adapter

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This topic contains 3 replies, has 3 voices, and was last updated by  Vadim Smirnov 13 years, 6 months ago.

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  • #4853

    Billk
    Participant

    Using the Winpk Filter product…

    What is a way to find the network adapter that is being used for the Internet, or any active TCP/IP network connection for that matter?

    Thanks!

    #5568

    Vadim Smirnov
    Moderator

    There is no difference on the NDIS level between network adapter connected to the corporate network and internet adapter connected to the Internet. However, you can use IP HELPER API to query routing table, usually the default gateway interface (route 0.0.0.0 mask 0.0.0.0) is the Internet one. IP Helper API can be also used for enumeratimg active connections.

    #5569

    PLY
    Participant

    Can you give me an example code for use IP HELPER API to find the network adapter that connected the Internet ?

    #5570

    Vadim Smirnov
    Moderator

    I’m sorry, I have not ready function for this, but you can use GetIpForwardTable for retrieving the IP routing table. Usually the deafault gateway interface (0.0.0.0 mask 0.0.0.0 is the Internet one).

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