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I don't understand why my network behave like this, Data sent is larger than Receive whenever I am sending email or upload files, this only happens when uploading something to the web, ftp, email attachment etc. I have turned off airport and set the firewall to "Block all incoming connections"

My modem has max. speed of only 3.1Mbps EVDO

Can anyone can explain this to me?

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I don't understand your problem. When you send data, isn't it expected that more data goes out than comes in? – Harald Hanche-Olsen Jul 25 '12 at 11:08
I am sorry for not make it clear about the data being sent, the image above shows the data sent by only sending 20MB of data, but the traffic shows GB data being sent. It goes to 60+GB when the upload finished. – SinyoMbethik Jul 25 '12 at 11:29
Well, what software is generating the information we see in the picture? It is unfamiliar to me, but I would suspect the software to be badly broken. – Harald Hanche-Olsen Jul 25 '12 at 12:25
It is called Network Inspector from mac app store, the lower part of the picture shows Activity Monitor.I try Network Inspector because MenuMeters shows the same behavior (uploading much more data than it should be), I have uninstalled MenuMeters before installing Network Inspector. – SinyoMbethik Jul 25 '12 at 12:35
You could try experimenting with netstat in a Terminal window. Run for example netstat -b -w 10 to get an overview of network traffic sampled by 10 second intervals (hit ctrl-C to quit). You can also run netstat -i -b to get totals so far sorted by interface. Replace -i by -I en0 to get totals for interface en0. – Harald Hanche-Olsen Jul 25 '12 at 14:25

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