I just got a MikroTik RB750GL and i’m not sure how to configure it the way I want.
A small diagram of what I want to achieve:
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I want ports 2-4 to be a standard LAN network with dhcp and I want port 5 to directly connect to the the modem.
One way to achieve this would be to place a switch behind the router but that seems silly.
I tried creating a bridge and added ports 1 and 5 to that bridge. For some reason I wouldn’t be able to connect to the internet now on ports 2-4. Adding port 2 to the bridge as well made me able to connect to the internet but without DHCP.
How many public IP addresses would you expect to have from your modem?
Really if you have IP addresses, NAT rules, etc on eth1 then you should move them all to the bridge that you put eth1 into.
How many IPs does your ISP provide?.. most provide only one. In theory bridging should work if you can use more than one IP from your ISP. The other option (preferable to bridging) would be to use the switch chip… basically just set the master-port to ether1 on ether5. This basically converts those two ports to function as if there was a switch. Much faster than the bridge and also less CPU load.