URGENT: internet connection without modem, directly via Ethernet cable

Question

Hello,
I am about to change my internet provider. The old one: Arcor, using a DSL modem; the new one: Unitymedia, where it should be possible to connect the computer without any modem via an Ethernet cable to the internet "box".
The problem is that I have to newly configure my internet preferences but I don't know how. The computer doesn't work with the "automatic" button that shows up under the Ethernet preferences. The technician who installed the Unitymedia equipment had a perfect connection to the internet with his Windows laptop but my Mac would always say that there was "no connection" - however, the Ethernet cable WAS connected.
At the moment, I still use the old Arcor connection but it will be switched down very soon. So I do hope that you can help me very fast!
Thanks a lot!!

Answer 1

There was a time, some decades ago, I could read and
understand (and speak, some) of the German language
and this was interesting; as I also knew a little latin due
to scientific nomenclature and natural studies. But over
time and disuse, I am unfamiliar with most of the words.
(Probably only 15% now; down from 85%.)
The interest in electrical radiation effects from cellular,
electrical transmission, and other sources including
home microwave oven leakage and general broadcast
of open signals across various bandwidths has been
around for some time. And opening more bandwidth
to commercial devices will certainly increase along with
the digital marketplace of new devices using freed-up
former free broadcast wavelengths and nearby towers
for localized transmissions to narrow markets.
I have one wireless base station and software to see who
in the vicinity is broadcasting; and there are a few I can
see when I am in the urban area, and nobody when I am
in the smaller town area about 100 miles out. A few new
cellular and data transmission towers are being built every
few miles in the rough terrain across Alaska; recent stuff.
Of these a some could support 3G and other wireless data.
Good luck in furthering your local network; the Apple document
entitled 'creating a small local network' may show basics; but I
think you are looking at more than the basics in this matter.
Best regards & wishes, in any case!
{Guten tag!}