I am new to RouterOS and need some help with setting up a configuration to connect two building by Dark Fiber. I purchased 2 RB2011LS-IN routers with the fiber cards. Router 1 will be located in building 1 and router 2 will be in building two. The two building are connected by dark fiber. Each building has its own subnet. Say, Building 1 has 10.1.0.0/16 and building 2 has 10.10.0.0/16. I need to keep the same subnet but route to each other over the fiber line. If you could, please help me out with the configuration.

You have to decide if the fiber link is going to be actually *on* one of those subnets or whether it will be its own link network linking the two networks together. Then of course the clients on in each building need to know to use the route to the other network so how do those clients currently get their IP addresses and what is their default gateway set to?

The fiber is going to be a seperate link to connect both networks together. Currently building two is unsing another router that has a vpn connection back to building 1. Right now building 2 has its own dhcp server provided my a 2008 windows server. The server is handing out a gateway to a router that connects to building 1 by vpn. Its gateway is 10.10.1.1 . Eventually I am going to drop this vpn connection and just use the fiber. At building 2, it has its own dhcp server as well and its gateway is 10.1.1.1.

The new routers would be like this - Building 2 would have an address of 10.10.1.100 (will change this later when the vpn router is out of the picture). Building 1 router will be 10.1.1.100. A new route will be added in the core router to send all 10.10.x.x traffic to the 10.1.1.100 router.

Building 1 will be the only source for internet access as well.

It must of been my cold. I had to make a change in my test environment to send back my network traffic back to my testing routers.

Here is a new description of my setup so far -

Router B -
ether2 - 10.1.1.100/16
spf1-gateway - 192.168.1.2/24

routes -
0.0.0.0/0 - 10.1.1.1 (testing core router with statement to send back traffic to 10.70.0.0/16 to 10.1.1.100)
10.70.0.0/16 to 192.168.1.1/24

Router A -
ether2 - 10.70.1.100/16
spf1-gateway - 192.168.1.1/24

routes -
0.0.0.0/0 - 192.168.1.2/24

I can now connect the two routers together. I connected a computer to Router A (by using static ip settings) and I am able to ping Router B and go to the internet (somewhat). If I use the tools from Router A to ping a computer on Router B side I cannot do it. But, I can ping from a computer on Router A side to a computer on Router B side.

I have no NAT or firewall rules since the connection between the two routers is going to be dark fiber.

The weird thing is that I can view some websites (home page only) behind Router A computer.

What am I missing in my configs on the routers for the smooth traffic flow?

Case closed. I figured out what was going on. The standard config placed ether ports 2-10 in a bridge switch mode. I removed this and just had a single port setup for the connection to the computer/lan switch. Thank you for your help.

As I am learning MikroTik I am starting to like what I see compared to Juniper and Cisco equipment.