[ECOS] How to let network stack know the netif down?

[wang cui]

I am using dp83902 ethernet driver in my target.

If the netif is connected to ethernet, it works fine. But if I disconnect 
the cabel, the netif remains in UP state.

So how to let network stack know this condition and shutdown this netif? 
And when the cable is reconnected, I want it to redo the DHCP operations.

Thanks in advance!

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