Correct routing: 2 internet connections per 1 Mikrotik?

Question

Computer networks

Hello!
There are 2 Internet connections of 100 Mbps from one provider.
The first one with the IP address 123.123.123.1
The second one with the IP address 213.213.213.2
Is it possible to correctly configure the balancer in Mikrotik so that 2 channels merge into one, but have 1 ip?

Answer 1

No. You can not do it this way. "Into one" and at the same time "from 1 ip" they can be merged only at the provider.
Please clarify why this is needed. Perhaps you need DNS round robin.
It will be correct to land connections on the balancer - nginx or haproxy. And there you can already set up sticky sessions so that once a session is set, it always goes to the same server.

Answer 2

One IP will not work.
Either merge from the provider, or dynamic protocols (see BGP)

Answer 3

If there is only one provider, then it is possible that he will miss the package from you with the wrong src address. here to test.
And if yes then you can use Bonding L3