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strange problem with netwrok on my embedded system

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mans0987

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I am working on an embedded system which is based on TI OMAP processor. The board which one of my friends designed, has an Ethernet connector.

I am using ping to check if it is working.

It is working for some minutes and then stops and doesn't start till I unplug and re-plug the cable.

The board has Linux on it, so when It stops working, I tried to reset the interface by uissuesing:

ifconfug eth0 down
inconfig eth0 up

but it has no effect.

I am not sure if it is a hardware problem, or a software one. How can I check that the hardware works properly?

How can I simulate cable disconnect and reconnect in software?
 

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