iptables open port
sudo iptables -A INPUT -p tcp --dport xxxx -j ACCEPTiptables open port
sudo iptables -A INPUT -p tcp --dport xxxx -j ACCEPTiptables deny all
# Set default chain policies
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT
# Accept on localhost
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT
# Allow established sessions to receive traffic
iptables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPTCopyright © 2021 Codeinu
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