Question

1. You have a web server running on port 8888 in a Linux computer, but without any firewall rules in place for protection.

Now, you want to use iptables to protect the website so that only computers from address 172.90.0.0/16 but excluding 172.90.255.0/24 can access the web server.

Show the commands of iptables that add the Linux firewall rules to enforce the protection.

Answer 1

• Iptables may be a package and kernel module for UNIX that uses World Wide Web filter hooks at intervals the UNIX kernel to supply filtering, network address translation, and packet mangling.
• Iptables may be a powerful tool for turning a daily UNIX system into an easy or advanced firewall.
• Managing the iptables daemon is simple to try to, however the procedure differs between UNIX distributions. Here   some things to stay in mind.
• Firstly, completely different completely different UNIX distributions use different daemon management systems. Every system has its own set of commands to try to to similar operations.
• The most unremarkably used daemon management systems   SysV and System.
• Secondly, the daemon name must be renowned. During this case the name of the daemon is iptables.
• Each line of associate iptables script not solely features a jump, however they even have variety of instruction choices that accustomed append rules to chains that match your outlined packet characteristics, such the supply IP address and protocol port.
• There are choices which will be accustomed simply clear a sequence therefore you'll begin everywhere once more
• Many choices may be used with the iptables command. As explicit on top of, iptables sets the foundations that management network traffic.
• You’ll outline completely different tables to handle these rules through chains, lists of rules that match a set of packets.
• The table contains a range of intrinsic chains; however you'll add your own.

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