@terziyski Thanks!
I think that I was wrong before, and it's not the router. 

What happens is that my streamer isn't able to get connectivity using Ethernet, but it does through WiFi. 

I tested the streamer with another ethernet socket - works -> it's not the streamer

I tested the streamer with the same socket - with another cable -> not working -> it's not the cable. 

I connected a laptop directly to the router's LAN socket - works. 

I think it's something wrong with the cabling. Will need to look more into this. 

In any case, I'm pretty convinced that it's not the router. (I did however installed a different firmware, reset to factory-settings as I was looking into this). 

Thanks for your response! I should have tested better before testing.