I have RB750 and removed default script.
I have static IP from ISP 206.75.200.154 and Gateway of ISP 206.75.200.1
I added next 3 lines to configuration:
/ip address add address=206.75.200.154/24 network=206.75.200.0 interface=ether1
/ip route add dst-address=0.0.0.0/0 gateway=206.75.200.1 disabled=no
/ip dns set servers=8.8.8.8,8.8.4.4 allow-remote-requests=yes
Now I am expecting to have Internet in the router. So I click “New Terminal” in winbox and start pinging IP addresses.
first of all - are you able to ping your default gateway 206.75.200.1?
just in case the router is trying to use a private ip address that you may have on the router, make sure you specify the src-address in the ping command
ping 206.75.200.1 src-address=206.75.200.154
see if you have any other default gateways configured on your router, and/or a more specific route to the ip address you are trying to ping
if you are able to ping your default gw - do a traceroute to say 8.8.8.8 (remembering to specify src-address), and see where the trace stops?
If you don’t have any luck, please post results from following commands
ip route print
ip address print
ip firewall nat print