Unable to configure router 450G to route internet traffic

RouterOS Beginner Basics
1

All,

I need help configuring a routerboard 450G. My ISP is provide me service on a Cable modem which is connected to a Cisco 1900 switch. When I plug my ubiquiti M2 and M5 antenna in the Cisco switch that is connected to the modem I can route to the internet.

When I connect my RouterBoard 450G to the same modem as the Cisco switch and plug in my M5 and M2 sector antennas I’m unable to route our to the internet. I have DHCP enable on the router as well as NAT since the Cable Modem is giving out a NAT priviate address.

How do i configure the router to work with the cable modem receiving a private IP from the modem to work with my M antenna’s the router is running version 5.14 software

2

HI
Are you having different IP subnets on the outside and inside of your router?
Are you able to ping your outside GW from the router?

3

It would be a good idea to ask your provider to bridge the modem.

4

first: Reset Configuration the RB450G.if your device is the default, no need to do this step.
in menu: System — Reset Configuration
second: connect the cable that your ISP provided to your RB450G’s ether1
and. config the ether1’s IP address,like this:
in menu: IP — Addresses — +
Address:the ISP provided IP address information (like this: 172.10.1.2/24)
Interface: ether1-gateway
and OK
third: in menu: IP — Routes — +
Gateway: your ISP provided
Distance: 1
and OK
fourth: in menu: IP — DNS
Servers: your ISP provided
and OK
fifth: in menu: IP — Firewall — Filter Rules
if not, +
General Chain: forward
Action Action: accept
and OK
end. you can try it . see see can the subnet go to the internet?