Useful ip table commands

gistfile1.txt

list ip tables
  sudo iptables -S

list nat ip tables
  sudo iptables -L -vt nat
  
Delete nat ip tables
  for i in $( iptables -t nat --line-numbers -L | grep ^[0-9] | awk '{ print $1 }' | tac ); do iptables -t nat -D PREROUTING $i; done

http://lubos.rendek.org/remove-all-iptables-prerouting-nat-rules/