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$ sudo iptables -n -L INPUT -v -line-numbersĬhain INPUT (policy ACCEPT 0 packets, 0 bytes)
![iptables tutorial iptables tutorial](https://image.slidesharecdn.com/iptables-120825062643-phpapp02/95/iptables-configuration-14-728.jpg)
![iptables tutorial iptables tutorial](https://www.elchecibernetico.com/wp-content/uploads/2015/12/phppage.png)
$ sudo iptables -A INPUT -p tcp -dport 443 -j ACCEPT $ sudo iptables -A INPUT -p tcp -dport 80 -j ACCEPT $ sudo iptables -A INPUT -p tcp -dport 22 -j ACCEPT $ sudo iptables-restore < iptable_filenameĪllow only connection to port 22, 80 and 443
![iptables tutorial iptables tutorial](https://i.ytimg.com/vi/qFJ9FEiDCmk/hqdefault.jpg)
Linux iptables is a user-space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall (implemented as different Netfilter modules) and the chains and rules it stores.
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