My network uses static IP distrobution instead of DHCP or dynamic. So, I plugged PI 3 on the network and updated the INTERFACES file as below.
auto eth0 iface eth0 inet static static ip_address=192.168.1.3 static routers=192.168.1.1 static domain_name_servers=192.168.1.1
This works partially. My PI 3 is able to ping any computers connected to my network, but when I tell it go out on the Internet it fails.
I don't know why this is.