Auto-Choose Internet Network Adapter

[Billk]

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!

[Vadim Smirnov]

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.

[PLY]

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

[Vadim Smirnov]

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).

[Author]

Posts