How to configure Redundancy on Mikrotik router
This example will show how to configure a MikroTik Router with a secondary WAN port for failover in the case of redundancy if the primary WAN port goes down.
1. Go to New Terminal and then add IP Primary WAN to Ether1
/ip address add address=1.1.1.1/30 interface=ether1 comment="primary wan" disabled=no
2. Add IP Secondary WAN to Ether2
/ip address add address=2.2.2.2/30 interface=ether2 comment="failover wan" disabled=no
3. Add DNS
/ip dns set allow-remote-requests=yes servers=8.8.8.8,8.8.4.4
4. Add IP Internal 192.168.1.1/24 on Ether3
/ip address add address=192.168.1.1/24 interface=ether3 comment="internal network" disabled=no
5. Configure DHCP for client
/ip dhcp-server setup
Select interface to run DHCP server on
dhcp server interface: ether3
Select network for DHCP addresses
dhcp address space: 192.168.1.0/24
Select gateway for given network
gateway for dhcp network: 192.168.1.1
Select pool of ip addresses given out by DHCP server
addresses to give out: 192.168.1.2-192.168.1.254
Select DNS servers
dns servers: 192.168.1.1
Select lease time
lease time: 3d
6. Configuring NAT for Internet Access
/ip firewall nat add chain=srcnat action=masquerade comment="nat internet access" disabled=no
7. Setup the default routes and have the router check the main WAN port. If the router does not receive a response then route traffic out the failover WAN port:
/ip route add dst-address=0.0.0.0/0 gateway=1.1.1.1 check-gateway=ping distance=1 disabled=no
/ip route add dst-address=0.0.0.0/0 gateway=2.2.2.2 distance=2 disabled=no
Source
http://blog.gowifi.co.nz/2012/10/mikrotik-dual-gateway-failover.html
Select interface to run DHCP server on
dhcp server interface: ether3
Select network for DHCP addresses
dhcp address space: 192.168.1.0/24
Select gateway for given network
gateway for dhcp network: 192.168.1.1
Select pool of ip addresses given out by DHCP server
addresses to give out: 192.168.1.2-192.168.1.254
Select DNS servers
dns servers: 192.168.1.1
Select lease time
lease time: 3d
6. Configuring NAT for Internet Access
/ip firewall nat add chain=srcnat action=masquerade comment="nat internet access" disabled=no
7. Setup the default routes and have the router check the main WAN port. If the router does not receive a response then route traffic out the failover WAN port:
/ip route add dst-address=0.0.0.0/0 gateway=1.1.1.1 check-gateway=ping distance=1 disabled=no
/ip route add dst-address=0.0.0.0/0 gateway=2.2.2.2 distance=2 disabled=no
Source
http://blog.gowifi.co.nz/2012/10/mikrotik-dual-gateway-failover.html
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