Question about net subsystem

["zhanglx" <zhanglx@semico.com.cn>]

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hello,

I have some questions about net subsystem.

Does the kernel code store the IP address of local machine, in which variable?

If there are two net cards, then there will be two IP and MAC address, how will the kernel store them? When there are two net cards, which card will the PC use to connect to net.

Does the webbrowser such as Firefox also use the series of functions( sock(), connect(), send(),receive()...) to connect to internet?

Thanks,
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