Load Balancing and Fail Over with Mikrotik

Load Balancing to combine Internet connections from two ISPs, while making a gateway fail over as backup.

This sample I have tried in the Mikrotik version of 3:30 and runs smoothly, we begin to be ok

First you need an interface card must be three pieces: one for the LAN and two for the WAN.

> interface pr

Flags: D - dynamic, X - disabled, R - running, S - slave

# NAME TYPE MTU L2MTU

0 R WAN2 ether 1500

1 R WAN1 ether 1500

2 R LAN ether 1500 1600

Now add the ip addresses (customize to your network)

> ip address add address=172.16.0.30/27 interface=LAN disabled=no

> ip address add address=192.168.1.100/24 interface=WAN1 disabled=no

> ip address add address=192.168.10.100/24 interface=WAN2 disabled=no

> ip address pr

Flags: X - disabled, I - invalid, D - dynamic

# ADDRESS NETWORK BROADCAST INTERFACE

0 172.16.0.30/27 172.16.0.0 172.16.0.31 LAN

1 192.168.1.100/24 192.168.1.0 192.168.1.255 WAN1

2 192.168.10.100/24 192.168.10.0 192.168.10.255 WAN2

Each interface has the ip is in accordance with network conditions, then stayed to give her gateway

> ip route add dst-address=0.0.0.0/0 gateway=192.168.1.1,192.168.10.1 check-gateway=ping

> ip route pr

Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,

B - blackhole, U - unreachable, P - prohibit

# DST-ADDRESS PREF-SRC GATEWAY-STATE GATEWAY DISTANCE INTERFACE

0 A S 0.0.0.0/0 reachable 192.168.1.1 1 WAN1

reachable 192.168.10.1 WAN2

172.16.0.30 0 1 ADC 172.16.0.0/27 LAN

2 ADC 192.168.1.0/24 192.168.1.100 0 WAN1

3 ADC 192.168.10.0/24 192.168.10.100 0 wan2

Gateway we make two accordance with our plans before, and the example above, assuming both have a large WAN bandwidth the same, you can use asymmetric bandwidth links also - for example one link is 1Mbps other 2Mbps. Just use gateway=192.168.1.1,192.168.10.1,192.168.10.1

Adding NAT

> ip firewall nat add chain=srcnat out-interface=WAN1 action=masquerade

> ip firewall nat add chain=srcnat out-interface=WAN2 action=masquerade

> Ip firewall per night

Flags: X - disabled, I - invalid, D - dynamic

0 chain=srcnat action=masquerade out-interface=WAN1

1 chain=srcnat action=masquerade out-interface=WAN2

But, sometimes even there are one WAN down why we need to create a fail over that function if one uses a single WAN gateway direct die alone.

> Ip firewall missing add chain = input in-interface = WAN1 action = mark-connection new-connection-mark = wan1_conn

> Ip firewall missing add chain = input in-interface = WAN2 action = mark-connection new-connection-mark = wan2_conn

> Ip firewall missing add chain = output connection-mark = wan1_conn action = mark-routing new-routing-mark = ke_wan1

> Ip firewall missing add chain = output connection-mark = wan2_conn action = mark-routing new-routing-mark = ke_wan2

> Ip firewall missing per

Flags: X - disabled, I - invalid, D - dynamic

0 chain=input action=mark-connection new-connection-mark=wan1_conn passthrough=yes in-interface=WAN1

1 chain=input action=mark-connection new-connection-mark=wan2_conn passthrough=yes in-interface=WAN2

2 chain=output action=mark-routing new-routing-mark=ke_wan1 passthrough=yes connection-mark=wan1_conn

3 chain=output action=mark-routing new-routing-mark=ke_wan2 passthrough=yes connection-mark=wan2_conn

[admin@MikroTik] > ip route add dst-address=0.0.0.0/0 gateway=192.168.1.1 routing-mark=ke_wan1

[admin@MikroTik] > ip route add dst-address=0.0.0.0/0 gateway=192.168.10.1 routing-mark=ke_wan2

[admin@MikroTik] > ip route pr

Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,

B - blackhole, U - unreachable, P - prohibit

# DST-ADDRESS PREF-SRC GATEWAY-STATE GATEWAY DISTANCE INTERFACE

0 A S 0.0.0.0/0 reachable 192.168.10.1 1 WAN2

1 A S 0.0.0.0/0 reachable 192.168.1.1 1 WAN1

2 A S 0.0.0.0/0 reachable 192.168.1.1 1 WAN1

reachable 192.168.10.1 WAN2

3 172.16.0.30 0 ADC 172.16.0.0/27 LAN

4 ADC 192.168.1.0/24 192.168.1.100 0 WAN1

5 ADC 192.168.10.0/24 192.168.10.100 0 wan2

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