Two networks on one port and NAT

RouterOS General
1

Hi,
I have a Mikrotik router. WAN is connected to my fiber provider and one of the LAN ports is connected to a bigger switch.
The network is 10.0.0.0/24 and everything works like a charm. Well, almost.
I’ve got one special device that for some reason has a reserved address space 10.0.0.0/8. That device must have the address 192.168.1.1.

Now, I’d like to do NAT in a way that 10.0.0.5 will be translated to 192.168.1.1.
So that my special device thinks Mikrotik router is 192.168.1.2 and all computers on my network thinks that the special device is 10.0.0.5.

2

This should do it:

/ip address
add interface=<LAN> address=10.0.0.5/32
add interface=<LAN> address=192.168.1.2 network=192.168.1.1
/ip firewall nat
add chain=dstnat dst-address=10.0.0.5 action=dst-nat to-addresses=192.168.1.1
add chain=srcnat dst-address=192.168.1.1 action=src-nat to-addresses=192.168.1.2
3

That works, thanks!