filter packet

ETC Homework & Coursework Questions
1

Exercise:
Protection of WEB and DNS servers using the context-free rules for packet filtering:

  • Protect your WEB-server, so that would be for him can be accessed by browsers, and could go to dns.
  • Protect your primary DNS-server so that it could be to contact clients and secondary servers.
  • Allow ICMP ping to / from your site (s).
  • the rest is declined.

My solution that:

#service iptables start
#iptables -P INPUT DROP
#iptables -P OUTPUT DROP
#iptables -P FORWARD DROP
#iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
#iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT
#service iptables save
#serivce iptables reload

but i don't know why my code doesn't work!!!
can anybody help me?

2

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