Ethernet active but not working - Airport works perfect

Dear all,
I have a very strange problem with my iMac.
One hour ago internet was working perfectly while being connected via ethernet cable.
Now it does not anymore.
General Settings - Network
The led of the ethernet is green when IPv4 configured manually - but internet does NOT work!!!
The led of the ethernet is green when IPv4 configured DHCP - and internet works!!!
In both settings then only thing that changes is the IP address, i.e.:
Manually I have to configure it as 192.168.1.21
With DHCP the IP is 192.168.1.160
I have read lots of discussions and tried the following:
Tested cable with LAN tester - fine
Tested switch / router / other computers connectivity via ethernet - fine
Tested connectivity on my computer using Airport and it works fine
Reset the SMC
Set service order Ethernet (top), then Wi-Fi
Launched terminal command netstat with following result
Name  Mtu   Network       Address            Ipkts Ierrs    Opkts Oerrs  Coll
en0   1500  <Link#4>    34:15:9e:36:b6:16     1040     0     7489     0     0
en0   1500  brs-server. fe80:4::3615:9eff     1040     -     7489     -     -
en0   1500  192.168.1     192.168.1.21        1040     -     7489     -     -
Please HELP!!!

Yes I can and I've done it.
But it is when I do that, Internet stops working.
I checked IP, subnet, gateway, DNS... all is correct but internet does not work, although the "led" into ethernet connection of the network settings is green!

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