NAT only one port

RouterOS General
1

Hello,

I am trying to deliver public ips to some costumers. This is what i want to do and i think i need a little help.




The topology is show in the atachment. In this case i only want that the port eth5 will be nat using the public ip 1

Best regards
rb one nat.png

2

You can NAT the public IP’s to your customers using the answer from this post:

http://forum.mikrotik.com/t/how-do-i-setup-router-for-public-29-address-space/71870/1

Or you can route the public IP’s by sub-netting them on a /30 network.

3

Thanks for the quick rep

This looks like a 1:1 Nat, it could work i didn’t try on my enviroment yet but it sounds as it work. I was thinking in nat only the port eth5 masquerading the packet with ip of eth1 because this is LAN network. And leave ethernet from 2-4 without natting. Because this ports eth2-eth4 will have public ip

Best Regards

4

You can bridge the interfaces ether1-4 and assign your desired local IP to ehter5.
Give the bridge a public IP available to you.

5

It didn’t work beacuse in this case if i bridge from eth1-4 i’ll be doing a loop betwenn external an internal interfaces.