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Mikrotik DUAL WAN Load Balancing using PCC method

Following is a complete script for Mikrotik to combine/load balance two DSL lines. In this example I used MikrotikT RB750 5 ports router.

2 ports were connected with two difference DSL Routers,
and 3rd port was connected with User LAN.
Both DSL are of same speed , i.e 10Mb each.

DSL MODEM IP’S
DSL MODEM 1 = 192.168.1.1
DSL MODEM 2 = 192.168.2.1

Also don’t forget to rename the interface names accordingly.

In my personnel experience , If users request are directly hitting Mikrotik configured with PCC , then you will get good load balancing. Use src-address as classifier, this way you will get rid of problems like https/broken link, streaming issues etc. Load balancing using this PCC technique (src-address) will be effective and balanced approach when more and more connections (from clients) that occurred. I also recommend to use SQUID proxy server along with mikrotik , either parallel or in front or backend , for better response time and it will also increase good browsing experience to users.

If somehow you are not satisfied with the src-address approach,play with the PCC-Classifier, then Try both addresses and ports as the classifier. While this will randomize things the most and in theory give you the most fair allocation of bandwidth, BUT there is also a good chance that it will break certain things like banking web sites and some forums. This is because often times a HTTP requests will generate several connections, so there is a chance that some requests may go out a different route than the initial one, and that will break secure web sites. For that reason I usually stick with src-address for PCC load balancing.

 

/ip address

add address=192.168.0.1/24 network=192.168.0.0 broadcast=192.168.0.255 interface=Local

add address=192.168.1.2/24 network=192.168.1.0 broadcast=192.168.1.255 interface=WAN1

add address=192.168.2.2/24 network=192.168.2.0 broadcast=192.168.2.255 interface=WAN2

 

/ip dns set allow-remote-requests=yes cache-max-ttl=1w cache-size=5000KiB max-udp-packet-size=512 servers=8.8.8.8

 

/ip firewall mangle

add chain=input in-interface=WAN1 action=mark-connection new-connection-mark=WAN1_conn

add chain=input in-interface=WAN2 action=mark-connection new-connection-mark=WAN2_conn

 

add chain=output connection-mark=WAN1_conn action=mark-routing new-routing-mark=to_WAN1

add chain=output connection-mark=WAN2_conn action=mark-routing new-routing-mark=to_WAN2

 

add chain=prerouting dst-address=192.168.1.0/24 action=accept in-interface=Local

add chain=prerouting dst-address=192.168.2.0/24 action=accept in-interface=Local

 

add chain=prerouting dst-address-type=!local in-interface=Local per-connection-classifier=both-addresses-and-ports:2/0 action=mark-connection new-connection-mark=WAN1_conn passthrough=yes

add chain=prerouting dst-address-type=!local in-interface=Local per-connection-classifier=both-addresses-and-ports:2/1 action=mark-connection new-connection-mark=WAN2_conn passthrough=yes

 

add chain=prerouting connection-mark=WAN1_conn in-interface=Local action=mark-routing new-routing-mark=to_WAN1

add chain=prerouting connection-mark=WAN2_conn in-interface=Local action=mark-routing new-routing-mark=to_WAN2

 

/ip route

add dst-address=0.0.0.0/0 gateway=192.168.1.1 routing-mark=to_WAN1 check-gateway=ping

add dst-address=0.0.0.0/0 gateway=192.168.2.1 routing-mark=to_WAN2 check-gateway=ping

 

add dst-address=0.0.0.0/0 gateway=192.168.1.1 distance=1 check-gateway=ping

add dst-address=0.0.0.0/0 gateway=192.168.2.1 distance=2 check-gateway=ping

 

/ip firewall nat

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

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

 

 

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