Detecting link state

Hi everyone,

is there a good way to detect if an Ethernet link has been established
when using Ethernut? I see that this has been discussed in the past, but
could not find any outcome:

http://microcontrollers.2385.n7.nabble.com/detecting-an-unplugged-network-cable-td160042.html

Thanks.

Best regards,
Philipp
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