Iptables is a  firewall on linux  os.You can manage your ınput and output traffic with a lots of properties.You can use iptables like a router, nat or proxy too.

There are three default chain comes with  iptables.These are

Input:You can arrenge packets that comes to your computer.

Forward:You can arrrange packets that forwarded on your computer.

Output:You can arrange your output packets from your computer.

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