Help Urgent - Routed Subnets

RouterOS Beginner Basics
1

Hello all,

This is my first post so please be gentle.

I’m installing a Mikrotik RB2011L-RM at a data center, and I had it set up to use static IP’s except at the last minute this specification has changed to a routed subnet! As I have one day to figure this out I thought I would ask for help here.

I attached an image of the topology we will be using for clarity, but I need help with the configuration. In a nutshell;

  • The WAN connection of the router has been given a 78.x.x.18 on a /30 subnet, with .17 being the ISP’s gateway.
  • We have been provided a routed subnet of 79.x.x.24/29 to use for our own use.
  • Five of the IP’s need to be 1:1 NAT’d (or destination/source NAT’d if you prefer) to the private LAN addresses in the image.
  • One of the IP’s is to be passed through and used on an offsite router for a client. I assume I just set up the WAN interface of their router with the static IP.
  • Due to the nature of the existing setup (before I move to the above setup) the private IP’s (10.19.14.x) need to be in place. We can’t assign the public IP’s directly on the VM’s and host.

I appreciate any help that can be given.

Thank you for reading.

Chris

2

My advise would be to configure the 5 addresses that need NAT to be assigned to the ether1 interface and create dstnat/srcnat rules for the various internal IP’s.
Regarding the off-site system I think you are right.
The only thing you have to do then is to bridge ether1 and ether3 and move all IP and NAT config away from ether1 and put in on the bridge. Or configure ether3 to have ether1 as master-port, that’s a second option.

3

Thank for your quick reply Rudios.

To reply to your post,

  • I have already created the 5 address and dstnat/srcnat rules so I think I’m OK in that regard, would I create a static route from that IP to the WAN IP of the router?
  • Bridging or master/slaving sounds like the right direction. I’m in a position to test this tomorrow as I will be on site.

Thank you again.