# Load Balancing LB PCC 2 Line ISP Failover - Mikrotik Script RouterOS

    Load balance PCC 2 ISP on mikrotik is a technique for distributing traffic load on two or more connection lines in a balanced way, so that traffic can run optimally, maximize throughput, reduce response time and avoid overloading one of the connection lines.

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    # LOAD BALANCING (LB) PCC SCRIPT GENERATOR
    # Date/Time: 2/13/2021, 9:19:38 PM
    # https://fb.me/buananet.pbun
    # Load Balancing Metode -> PCC
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    /ip firewall address-list
    add address=192.168.0.0/16 list=LOCAL-IP
    add address=172.16.0.0/12 list=LOCAL-IP
    add address=10.0.0.0/8 list=LOCAL-IP

    /ip firewall nat
    add chain=srcnat out-interface="ether1" action=masquerade
    add chain=srcnat out-interface="ether2" action=masquerade

    /ip route
    add check-gateway=ping distance=1 gateway="192.168.1.1" routing-mark="to-ether1"
    add check-gateway=ping distance=1 gateway="192.168.2.1" routing-mark="to-ether2"
    add check-gateway=ping distance=1 gateway="192.168.1.1"
    add check-gateway=ping distance=2 gateway="192.168.2.1"

    /ip firewall mangle
    add action=mark-connection chain=input in-interface="ether1" new-connection-mark="cm-ether1" passthrough=yes
    add action=mark-connection chain=input in-interface="ether2" new-connection-mark="cm-ether2" passthrough=yes
    add action=mark-routing chain=output connection-mark="cm-ether1" new-routing-mark="to-ether1" passthrough=yes
    add action=mark-routing chain=output connection-mark="cm-ether2" new-routing-mark="to-ether2" passthrough=yes
    add action=mark-connection chain=prerouting dst-address-list=!LOCAL-IP dst-address-type=!local new-connection-mark="cm-ether1" passthrough=yes per-connection-classifier=both-addresses-and-ports:2/0 src-address-list=LOCAL-IP
    add action=mark-connection chain=prerouting dst-address-list=!LOCAL-IP dst-address-type=!local new-connection-mark="cm-ether2" passthrough=yes per-connection-classifier=both-addresses-and-ports:2/1 src-address-list=LOCAL-IP
    add action=mark-routing chain=prerouting connection-mark="cm-ether1" dst-address-list=!LOCAL-IP new-routing-mark="to-ether1" passthrough=yes src-address-list=LOCAL-IP
    add action=mark-routing chain=prerouting connection-mark="cm-ether2" dst-address-list=!LOCAL-IP new-routing-mark="to-ether2" passthrough=yes src-address-list=LOCAL-IP
    Credit: https://www.o-om.com/2020/12/load-balancing-pcc-script-generator-for.html