Hello there,
Im trying to achieve something like this on the photo
I have two different Public IP’s from same ISP with different gateways for Public IP
And i want to use one mikrotik for both of those IP’s
I don’t want Load Balancing or Failover
I just want something like on the photo.

Thanks in advance
On the begining, unbound eth3 from chip switch (eth1 is unbounded by default)
/interface ethernet set ether3 master-port=none
… and set the addresses
/ip address add interface=ether1 address=
/ip address add interface=ether3 address=
The last step is adjusting firewall filter and NAT. You can just copy proper rules and replace interface or add eth1 and eth3 to a interface list and modify existing rules.
The easyiest way to change gateway in your case is just set it staticly on the client. If you want to use DHCP, unbound eth4 and set IP from your local subnet on it. Next set DHCP Server on it.