We will list all four along with the chains each table contains. Linux firewall iptables has four default tables. Typically, this is to accept it, drop it, or reject it (which sends an error back to the sender). Targets: A target is a decision of what to do with a packet.The outcome, where a packet is sent, is called a target. Rules can block one type of packet, or forward another type of packet. Rules: A rule is a statement that tells the system what to do with a packet.When a packet is received, iptables finds the appropriate table, then runs it through the chain of rules until it finds a match.
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