DNS_FORWARD=$(dig $(hostname) +short)
DNS_REVERSE=$(dig -x $(ifconfig eth0 | grep "inet addr" | cut -f2 -d: | cut -f1 -d " ") +short)

if [ -z $DNS_FORWARD ] || [ -z $DNS_REVERSE ]
then
        echo
	echo "ERROR: Forward and reverse DNS must be configured"
	echo "	Forward DNS: $DNS_FORWARD"
	echo "	Reverse DNS: $DNS_REVERSE"
	echo
        exit 1
fi