#!/bin/bash

IFACE=$1
ACTION=$2

if [ -n "$IFACE" -a "$IFACE" = "ppp0" ]; then
    if [ -n "$ACTION" -a "$ACTION" = "up" ]; then

        ip -6 route add default dev $IFACE
        systemctl restart dhcpcd.service

    fi

    if [ -n "$ACTION" -a "$ACTION" = "down" ]; then

        ip -6 route del default dev $IFACE

    fi
fi