Hi I have some problem with situation below:

ether1 - ISP1, IP: A.A.A.A/30
ether2 - ISP2, IP: B.B.B.B/30
ether3 - lan IP: 192.168.0.1/16 and C.C.C.1/24 and pool of external IPs from provider ISP2

I would like to use internet from provider ISP1 for computers from range 192.168.0.0/16 (NAT) and internet from provider ISP2 for computers with external IP.

my config:
/ip firewall mangle
add action=mark-routing chain=prerouting comment="" disabled=no \
new-routing-mark=to_ISP1 passthrough=no src-address=192.168.0.0/16
add action=mark-routing chain=prerouting comment="" disabled=no \
new-routing-mark=to_ISP2 passthrough=no src-address=C.C.C.0/24



/ip route
add comment="ISP1" disabled=no distance=1 dst-address=0.0.0.0/0 \
gateway=A.A.A.1 routing-mark=to_ISP1 scope=30 target-scope=10
add comment="ISP2" disabled=no distance=1 dst-address=0.0.0.0/0 \
gateway=B.B.B.49 routing-mark=to_ISP2 scope=30 target-scope=10


/ip firewall nat
add action=masquerade chain=srcnat comment=nat disabled=no \
src-address=192.168.0.0/16


please helt because with this config nothing works.

Misha

Try changing your mangle rules:

/ip firewall mangle
add action=mark-connection chain=prerouting comment="" disabled=no \
new-connection-mark=mark_ISP1 passthrough=yes src-address=192.168.0.0/16
add action=mark-routing chain=prerouting comment="" disabled=no \
new-routing-mark=to_ISP1 passthrough=no connection-mark=mark_ISP1
add action=mark-connection chain=prerouting comment="" disabled=no \
new-connection-mark=mark_ISP2 passthrough=yes src-address=C.C.C.0/24
add action=mark-routing chain=prerouting comment="" disabled=no \
new-routing-mark=to_ISP2 passthrough=no connection-mark=mark_ISP2

That's off the top of my head. The idea is that you mark the connection first, then mark the routing based on the connection mark.

Also, if your default route is through ISP1, there would be no need to mark for ISP1 at all (or vice versa). You only need to policy route for stuff that you don't want using the default route.