netdev - Question: eth0 and wlan0 traffic load

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Message-ID: <CAF1ivSaY3s-Vjbe7_vziCRCEsaXduug3+2G9R55SUBQ8HPT6hQ@mail.gmail.com>
Date:	Sat, 7 Jul 2012 11:28:36 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
To:	netdev@...r.kernel.org
Cc:	Eric Dumazet <eric.dumazet@...il.com>
Subject: Question: eth0 and wlan0 traffic load

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?

       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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