Question

CentOS iptables configuration

Hello,

I followed this tutorial and now my iptables configurations has following rules:

sudo iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
sudo iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP
sudo iptables -A INPUT -p tcp --tcp-flags ALL ALL -j DROP
sudo iptables -A INPUT -i lo -j ACCEPT
sudo iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
sudo iptables -A INPUT -p tcp -m tcp --dport 443 -j ACCEPT
sudo iptables -A INPUT -p tcp -s [some_IP_address] -m tcp --dport 22 -j ACCEPT
sudo iptables -I INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
sudo iptables -P OUTPUT ACCEPT
sudo iptables -P INPUT DROP

My question is - does it mean that all ports on my server are closed for inbound connections except 80, 443 and port 22 opened for a given IP address.

Regards, Velizar

Subscribe
Share

Submit an answer
You can type!ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

You are correct, above rules will block all incoming connections except for port 80 and 443. And port 22 is open for your IP address. :)