#!/bin/bash

IP=$(curl -s ip.rbn.gr)
IPV6=$(curl -s ipv6.rbn.gr)
IPV4=$(curl -s ipv4.rbn.gr)

if [ $IP == $IPV6 ]; then
        echo "IPv6 is default"
        echo $IPV6
        echo
        echo "IPv4 is fallback"
        echo $IPV4
else
        echo "IPv4 is default"
        echo $IPV4
fi