Partitioned iMac 27, HD2 set to be isolated from Internet, suddenly when HD2 is revived from sleep, it makes an Internet connection. All settings are the same, Network shows Ethernet is unplugged, but the indicator on modem shows connection.  Why?

Original set up 4 years ago stated no Internet connection HD2, it was fine until now.   What can I do about this?  Thanks.

What I tried first was restoring all those files in that folder to a week before the problem, to no avail.  When I was trying to find what was going on, I tested the coming out of sleep again with the Network window open.   The light started flashing, for 4-5 seconds, and then the little Network window jumped visibly, and the connection light went off.  Great, I thought, until I noticed that the iV4 had been switched from Off to DHCP, and I looked inside in Advanced, and it was the same there, when I had them both turned "off" for absolute certain.  This is a pro assault, and so from now on I am just doing a manual disconnect for all time except when I need  it on HD.  Do you know of any app to disconnect from the Internet?  Windows had one on my last computer, and that was very convenient.  I am concerned that unplugging all the time will affect the socket, and that is a major problem to get that repaired.  This is not a portable.  Why? you say.  Let me put it this way.  There is no such thing as freedom of speech in Canada.  If you speak out against government or institutional policies, that is is it for life, and the laws don't mean anything.  Thanks. 

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