====== iptables ====== * [[Firewall]] * [[Security]] * [[ufw]] == Firewall testing == Make a cron job run every five minutes that resets the firewall so you can prevent yourself from getting locked out while testing any changes. Here is a new cronjob entry: <code> */5 * * * * /etc/init.d/iptables restart </code> == Block an external IP address == <code>iptables -A INPUT -s <IP-ADDRESS> -j DROP</code> == Postfix == Port 25 only needs to be open if you are accepting incoming mail. === Accept LAN Traffic === Open all ports to a subnet <code> iptables -A INPUT -p tcp -s 192.168.12.0/24 -j ACCEPT </code>
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