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# 1  
filter packet

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:
Code:
#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!!!
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NTP was created to synchronize all participating computers to within a few milliseconds of Coordinated Universal Time (UTC).
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