Script to check the Forward/Reverse DNS entries are sane for host
#! /bin/bash</p>name=`hostname -f`
ip=$(ifconfig eth0 | grep "inet addr" | awk -F '[: ]' '{print $13}')
forward=$(host $name | awk -F " address " '{print $2}')
reverse=$(host $ip | awk -F "pointer " '{print $2}' | sed 's/\.$//g')
if [ "$ip" = "$forward" ]; then
echo -e "Forward Lookup is ok"
else
echo -e "\nForward lookup does not match with assigned IP address.IP address is $ip while DNS ponits to $forward."
fi
if [ "$name" = "$reverse" ]; then
echo -e "\nReverse Lookup is ok"
else
echo -e "\nReverse lookup does not match with hostname.Hostname is $name while Reverse DNS ponits to $reverse."
fi