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I often leave my Mac for some time to do assorted tasks. When I return and log into the screensaver, I can't visit my homepage, Google, because the Ethernet connection has disconnected, requiring a few minutes to reestablish DHCP before I can Google again. Is there a way to keep the Ethernet connection alive while my computer idles?
I'm using Mac OS X 10.8.4 Mountain Lion x64; on a 2013 MacBook Pro 15"; with an official Apple Mini DVI to Gigabit Ethernet adapter; plugged into a good cat5 cable.
I had similar problem with the wifi I use.
It would disconnect me after certain time of inactivity.
So when downloading big stuff it would disconnect me, unless I was active on the computer/web.
To prevent wifi been disconnected during long downloads or me not interacting with it:
In Terminal I entered following:
ping -i600 google.com
That would send a ping to Google than wait 600 seconds to send another ping and on and on...till I hit the control-C to stop it.
That will tell wifi I am active so it will stay up all the time.
The 600 sec (10 minutes) is a choice, and it worked for me. In my case it was the WiFi service provider that cut me off after been inactive for a while.
I think it may be because the location may be set to automatic. I would try the method here: https://wccftech.com/fix-internet-not-working-after-waking-mac/ - Use the method titled "Fix Internet Not Working Issue After Waking Your Mac Up From Sleep" - Just thought I would share if those are still looking for options to try
Spotlight -> System Preferences -> Energy Saver -> Power Adapter -> Computer sleep -> NeverandEnergy Saver -> Battery -> Computer sleep -> Never