Hi there,

I opened another topic but I think that I wasn't explicit enough so I will be now because I need help to figure it out how to use two ISP with 2 public subnets (IPv4) on a Mikrotik CHR Router.

So we have the following schema:

1. CHR with 4 virtual ports (ether1, ether2, ether3, ether4)
2. ISP1 provides a /29 IPv4 subnet on port ether1 that's routed via 1.1.1.1.
3. ISP2 provides a /27 IPv4 subnet on port ether4 that is routed via 2.2.2.2.
4. Ether2 and ether 3 are used for LAN.

I have DHCP server setup on bridge for LAN2 and LAN3 with LAN class 10.0.0.0/8.

L.E.: Default 0.0.0.0/0 route it's going through port ether1 (1.1.1.1). So when I add a new 0.0.0.0/0 I need to specify a Routing Mark rule in order to be able to use it too.

How do I make to use both ISP1 and ISP2 simultaneously on the same LAN class (10.0.0.0/8), without Load Balancing or Failover?

I tried to follow some tutorials from this forum but without success. What Mangle firewall rules should I create?

For start, decide how exactly you want to use them, you didn't write that.

How do I make to use both ISP1 and ISP2 simultaneously on the same LAN class (10.0.0.0/8), without Load Balancing or Failover?

Kind of decided how to use them :).

How do I make to use both ISP1 and ISP2 simultaneously on the same LAN class (10.0.0.0/8), without Load Balancing or Failover?

Kind of decided how to use them :).

Sorry, no.
Load balancing means nothing else than "using 2 ISP connection". When you then say you do not want to do load balancing
but use two ISP you contradict yourself!!!
So please be specific how you want to use the two ISP and how you want to split traffic from LAN onto WAN.