Whenever i insert the ethernet cable (from modem) into the "Internet" port in the router i get no internet, i can't get an ip-address by renewing DHCP as i could on my old router.

This DOCSIS 3.1 cable modem features a 2.5 Gbps LAN port, ideal for new cable services with speeds over 1 Gbps and for use with routers and computers that have a 2.5 Gbps WAN port.