claus2006

Please remember that we already had something similar with other OPi boards. On OPi One according to schematic SY8113B is used where in reality AX3833 is soldered to the PCB.
 
BTW: In this nice video review you can easily spot some voltage regulators by 'magic smoke' appearing: https://www.youtube.com/watch?v=mZD4HnwY2-8#t=9m42s

This means you have some troubles with your network.
 
Wrote on mobile phone

If you have DHCP server, your wired connection should work out of the box. You don't need to do anything. On all boards this is the same.
 
OPi PC2 is under development and network could be temporally broken. Check today's (automated) build.