Linux İşletim Sisteminde Port Açma Kapatma Anlatımı

Port Açma :
iptables -A INPUT -p tcp –dport -j ACCEPT
iptables -A INPUT -p udp –dport -j ACCEPT

Port Kapama :
Dışardan içeriye gelen istekleri kapatmak için :
iptables -A INPUT -p tcp –dport -j REJECT
iptables -A INPUT -p udp –dport -j REJECT

İçerden dışarıya giden istekleri kapatmak için :
iptables -A OUTPUT -p tcp –dport -j REJECT
iptables -A OUTPUT -p udp –dport -j REJECT

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