How to set up 2 provider channels on mikrotik with simultaneous availability of 2 interfaces?

Question

Computer networks

Good afternoon. There are 2 providers on mikrotik, one main second backup. When 1 falls, 2 rises. Is it possible to make both providers available for accessing the address from the outside, at the moment when the first channel is active, the second is not available. I would like the main traffic to go through one channel, but to be able to access the second channel (for example, via rdp)

Answer 1

Mikrotik and two providers - only {+union+}, sensible and verified.
Mikrotik RouterOS; two providers - balancing, routing, firewall (without scripts).
Uniform distribution of channels of two providers and access to their local resources on the Mikrotik router
Universal script for switching 2 Internet channels Mikrotik
Reserve channel + Two providers - Mikrotik. Failover. Load Balancing . (Very clear, all options considered).
Organization of a backup communication channel without scripts.
Failsafe scenario
Two offices with two redundant channels, round-robin redundancy. - from here, there is an updated script in the text.

Answer 2

At the input of the interface, you need to mark the packets and send responses to the interface from which they came. I can’t say exactly how to do it, but it’s pretty easy to google.

Answer 3

Can!
/ip firewall mangle
add action=mark-connection chain=prerouting connection-mark=no-mark in-interface=WAN1 new-connection-mark=cmISP1
add action=mark-connection chain=prerouting connection-mark=no-mark in- interface=WAN2 new-connection-mark=cmISP2
add action=mark-routing chain=prerouting connection-mark=cmISP1 new-routing-mark=rmISP1
add action=mark-routing chain=prerouting connection-mark=cmISP2 new-routing-mark =rmISP2
/ip route
add check-gateway=ping distance=1 gateway=1.1.1.1 routing-mark=rmISP1
add check-gateway=ping distance=1 gateway=2.2.2.1 routing-mark=rmISP2
add check-gateway=ping comment ="ISP1 default route" distance=1 gateway=1.1.1.1
add check-gateway=ping comment="ISP2 default route" distance=2 gateway=2.2.2.1
/ip route rule
add comment="Access to provider gateway only via corresponding interfaces to ensure ping check works properly" dst-address=1.1. 1.1/32 table=rmISP1
add dst-address=2.2.2.1/32 table=rmISP2
I don't promise that it will work right away, but that's the principle.