# Set local variables
:local firstInterface "ether2";
:local secondInterface "Rostelekom";
:local pingTo1 "8.8.8.8";
:local pingTo2 "217.112.35.75";
:local pingCount 5;
:local stableConnectFrom 70;
:local prefix ">>> ";

# Local variables
:local firstInterfaceName $firstInterface;
:local secondInterfaceName $secondInterface;

# Function to cleaning ARP table
:local clearArp do={
    :local dumplist [/ip arp find]
    :foreach i in=$dumplist do={
        /ip arp remove $i
    }
    :log info ($prefix . "ARP cleaned");
}

# Function to reconnect PPPoE connection
:local reconnectPPPoE do={
    /interface pppoe-client set $nameInterface disable=yes;
    :delay 1s;
    /interface pppoe-client set $nameInterface disable=no;
}

:log info ($prefix . "START PING to $pingTo1 & $pingTo2");

# Check FIRST interface
/interface pppoe-client {
    :if ( [get $secondInterface disable] = true) do={
        set $secondInterface disable=no;
        :delay 5s;
    }
}

# Check SECOND interface
/interface ethernet {
    :if ( [get $firstInterface disable] = true) do={
        set $firstInterface disable=no;
    }
}

/ip route {
    # Set objects to variables
    :set firstInterface [find dst-address="0.0.0.0/0" gateway=$firstInterfaceName];
    :set secondInterface [find dst-address="0.0.0.0/0" gateway=$secondInterfaceName];

    # Check routes
    :if ( [get $firstInterface distance] != 2 ) do={
        set $firstInterface distance=2;
        :log info ($prefix . "Distance for " . $firstInterfaceName . " corrected");
    }

    :if ( [get $secondInterface distance] != 1 && [get $secondInterface distance] != 3) do={
        set $secondInterface distance=3;
        :log info ($prefix . "Distance for " . $secondInterfaceName . " corrected");
    }

    # Get ping successfully packets. In percent
    :local pingStatus \
        ((( [/ping $pingTo1 interface=$firstInterfaceName count=$pingCount] + \
        [/ping $pingTo2 interface=$firstInterfaceName count=$pingCount] ) / ($pingCount * 2)) * 100);

    # Check Internet
    :if ( [get $firstInterface active] = false or $pingStatus < $stableConnectFrom) do={

        :log info ($prefix . "FIRST NO INTERNET!!!");

        # Change distance
        :if ( [get $secondInterface distance] != 1 ) do={
            set $secondInterface distance=1;
            :log info ($prefix . "Distance for " . $secondInterfaceName . " changed");
            $clearArp;
        }

        $reconnectPPPoE nameInterface=$secondInterface;

    } else={
        :log info ($prefix . "FIRST INTERNET CONNECTED");

        # Change distance
        :if ( [get $secondInterface distance] != 3 ) do={
            set $secondInterface distance=3;
            :log info ($prefix . "Distance for " . $secondInterfaceName . " changed");
            $clearArp;
        }
    }
}

:log info ($prefix . "END PING");