netdev - Re: Question: eth0 and wlan0 traffic load

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Date:	Fri, 06 Jul 2012 21:16:38 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Lin Ming <mlin@...pku.edu.cn>
CC:	netdev@...r.kernel.org, Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: Question: eth0 and wlan0 traffic load

On 07/06/2012 08:28 PM, Lin Ming wrote:
> On Host1
>    eth0: 192.168.1.102
> wlan0: 192.168.1.103
>
> On Host2, scp a file to Host1 via wlan0
> # scp tmp.file 192.168.1.103:/tmp
>
> But ifstat shows all traffic goes to eth0.
> Why does kernel choose eth0 although I use wlan0's address?
> Is this an intended behavior?

You have to be clever with routing rules, arp-filtering, and such
to ensure that works as you want.

Thanks,
Ben

>
>         eth0               wlan0
>   KB/s in  KB/s out   KB/s in  KB/s out
> 11989.26    286.05      0.00      0.00
> 11998.90    286.00      0.00      0.00
>   6910.18    170.63      0.00      0.00
> 10260.05    246.82      0.00      0.00
>   8295.90    202.12      0.00      0.00
> 11979.90    282.41      0.00      0.00
> 11618.39    274.71      0.00      0.00
>   7004.78    170.79      0.00      0.00
> 12003.33    286.21      0.00      0.00
>   7775.28    190.59      0.00      0.00
> 11980.18    280.76      0.00      0.00
> 11998.32    286.29      0.00      0.00
> 11995.61    286.08      0.00      0.00
> 11996.57    285.88      0.00      0.00
>   6938.20    162.98      0.00      0.00
>   6736.30    169.22      0.04      0.00
> 12000.92    284.83      0.00      0.00
> 12005.41    286.13      0.00      0.00
> 12000.58    286.27      0.00      0.00
> 11963.65    284.13      0.00      0.00
> 11935.24    281.32      0.00      0.00
> 12002.83    286.27      0.00      0.00
> 11997.59    285.68      0.00      0.00
>
> Thanks,
> Lin Ming
> --
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-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com


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