Problems with firewall configuration

[Tsabros Leonidas]

Geia sas kai pali, 
	prospatho na stiso enan aplo webserver se ena pc. Ola pane mia xara alla exo 
tin eksis aporia:

Otan kapoios tha thelisei na dei to webpage poy tha exo valei tote to paketo 
poy tha steilei (an ola pane kala) tha erthei ston ipologisti moy kai tha 
filtraristei apoto firewall. Ara ta paketa poy tha steilei tha einai tcp me 
source port 80 kai destination port 80 (fevgoyn apo to 80 sto pc toy kai 
erxonte sto 80 ston server). Profanos h apantisi apoton web server tha ginei 
me ton antistrofo tropo. Ara tha arkoyse se ena BOFH firewall me INPUT/
OUTPUT/FORWARD POLICY DROP na exo ta eksis rules 
iptables -A INPUT -p tcp --dport 80 -m state --state NEW,RELATED,ESTABLISHED 
-j ACCEPT
iptables -A OUTPUT -p tcp --dport 80 -m state --state ESTABLISHED,RELATED,NEW 
-j ACCEPT
?