failover with 3 WAN without balancing

Hardware MikroTik hardware general
1

Mikrotik RB2011UiAS-RM

RouterOS ver. 6.6

We have 3 different internet connections, the port configuration looks like this:

ethernet1 WAN1 – PPPOE connection, static IP
ethernet2 WAN2 – static IP
ethernet3 WAN3 – 3g internet connection switched to 3G router, IP: 192.168.4.4

ethernet4 – not in use
ethernet5 – not in use

ethernet6 – 192.168.1.0 subnet
ethernet7 – 192.168.2.0 subnet
ethernet8 – 192.168.3.0 subnet
ethernet9 – ethernet6
ethernet10 – ethernet6

bridge-local 192.168.88.1

My question is, can we do failover with this 3 WAN connections, without using balancing? If WAN1 is unaccessable, it should switch to WAN2, and if both WAN1 and WAN2 are down, it should switch to WAN3 3g. When Wan1 or Wan2 is up, it should switch back from 3g.

Is it possible to do this without writing a script, or somebody already did some configuration similar like this? Can somebody send me a link with a similar configuration?

2 
/ip route
add disabled=no distance=1 dst-address=0.0.0.0/0 gateway=WAN1 – PPPOE connection, static IP
add disabled=no distance=2 dst-address=0.0.0.0/0 gateway=WAN2 – static IP
add disabled=no distance=3 dst-address=0.0.0.0/0 gateway=192.168.4.4

Change WAN1 and WAN2 to your static ips…

3

hi,
here you need to enable “check gateway=ping” option?
And in this case, how are the NAT routes made?
3 rules to every out-interface? ether1-wan1, ether2-wan2, ether3-wan3?

thanks