Network goes offline

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hi.
i've been running weird network issues lately.
had mac mini 2012, connect internet straight line cable-modem (no routers or split things) once in while connection goes offline (network panel report cable unplug) , modem report there no computer connected it, if unplug cable on mac mini , plug on macbook gets connection no issue.

thinking may wire issues change cable , still happens , then...

when mac mini "state" can't make connection enthernet port, not connecting 1 mac other.

restarting doesn't fix problem, way fix shut down couple of hours , turn on again (just minutes doesn't seems fix don't know why)

have idea of whats going on?
 

network goes offline

question, why aren't using router? seems that's should rather unplugging computer time. , plugging directly, exposing computer directly internet.

anyways, when happens, sys pref show network disconnected or shows no ip?

cable modems have limit how many mac address can access network(internet) @ given time. that's dhcp lease. when "state", wait wait till lease expires before ca work again.
happened me when trying configure 10 routers in day... hit wall after 4 , couldn't on internet until dhcp leases expired.
 


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