Hello boys and girls,

In the past few weeks I'm trying to configure a MikroTik RB750GL.

I have 2 ISP. ISP1 gives me 2 static IP addresses secured by MAC:
For example:
10.10.10.1 with example MAC - FF:FF:FF:FF:FF:FB
10.10.10.2 with example MAC - FF:FF:FF:FF:FF:FF

ISP2 gives another IP address secured by MAC:
for example:
20.20.20.1 with example MAC - BB:BB:BB:BB:BB:BB

Also I have 2 LANs. Let's call them LAN1 and LAN2.I want them to be on a different networks but also to see each other. So I set the following IP addresses
LAN1 is on 192.168.10.0/24
LAN2 is on 192.168.20.0/24

What I want to do:

LAN1 to use the first external IP of ISP1 -10.10.10.1
LAN2 to use the second external IP of ISP1 - 10.10.10.2
And both to use ISP2 as fallback - 20.20.20.1

Ether1 uses the first MAC of ISP1 by default.
I create a bridge "BR.Internet", give it the second MAC of ISP1 and bridge it to Ether1.
I create masquerade for "BR.Internet" (same as the default one for Ether1 only with different out interface.
Now my external IP for both LANs is the one that bridge gets: 10.10.10.2

In the last few weeks I read a lot in the internet and this was the best I manage to do.

Every help will be appreciated! Thank you all in advance.