Dns discovery svc quering a CoreDNS

shell

#!/bin/sh 
ip=0
seg=0
while [ $seg -lt 256 ]; do 
  echo "$(date): Scanning 10.96.$seg.0/24..."
  ip=0 
  while [ $ip -lt 255 ]; do
    if answer=$(host 10.96.$seg $ip); then
     echo $answer
    fi
    ip=$(expr $ip + 1) 
  done 
  seg=$(expr $seg + 1) 
done 

Stop Leaking Kubernetes Service Information via DNS! - John Belamaric, Google & Yong Tang, Ivanti