Please make sure the MacOS open transport networking protocols is installed.
We will suggest that BILLION BROADBAND ROUTER has DHCP server enabled and MacOS gets an IP address automatically. Because, MacOS will get the other information at that same time, such as DNS IP address, subnet mask and Gateway IP address.

Click the Apple Manual -> Control Panel -> TCP/IP, then

> Select Connect via : Ethernet
> Select Configure : Using DHCP server

If you select Configure as Manually, then you have to enter

> IP Address : 192.168.1.1
> Subnet mask : 255.255.255.0
> Router address: 192.168.1.254
> Name server addr: ISP’s DNS IP addr or 192.168.1.254

Please refer above Question 4 for configuring manually.