firewall configuration

[Tsabros Leonidas]

Xoris na thelo na sas prikso kai exontas katalavei mod doylevei afto to
modelo client - server , tote den tha boro na kratiso sto firewall 
to OUTPUT policy DROP kai na xrisimopoihso enan kanona toy stil

iptables -A OUTPUT -p tcp --sport 80 -m state --state RELATED,ESTABLISHED -j 
ACCEPT
iptables -A OUTPUT -p tcp --sport 22 -m state --state RELATED,ESTABLISHED -j 
ACCEPT

Tespa xrisimopoiontas aftqa ta rules doylepsane ta services kanonika. H aporia 
moy einai an tha iparxei kapoio drawback stin oli ipothesi me afta ta rules 
to opoio den ksero logo aperias.