Question about net subsystem

Question about net subsystem

[zhanglx]

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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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Re: Question about net subsystem

[Américo Wang]

On Thu, Jul 22, 2010 at 09:21:30AM +0800, zhanglx wrote:
>hello,
>
>I have some questions about net subsystem.
>
>Does the kernel code store the IP address of local machine, in which variable?


Yes, it is in a per-interface struct, you must be interested in how
SIOCGIFADDR is handled.

>
>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.
>


This depends on your route table. :)


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

Sure.

Hope this helps.

Re: Question about net subsystem

[zhanglx]

There is a doc of LinuxIPNetworking on kernelnewbies.org. It describes 
networking in detail.

thanks,
zhanglx
----- Original Message ----- 
From: "zhanglx" <zhanglx@semico.com.cn>
To: "zhanglx" <zhanglx@semico.com.cn>; <linux-kernel@vger.kernel.org>
Sent: Thursday, July 22, 2010 9:21 AM
Subject: Question about net subsystem


> 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,
> zhanglx