![]() ![]() ![]() RETURN- Continues processing a packet within the calling chain. REJECT – Drops a packet sends an appropriate response packet (TCP Reset or an ICMP Port Unreachable message). LOG – Logs a packet to Syslog.( Log the connection status for network monitoring, TCP Built/teardown ) ![]() ![]() –string sequence of application layer data bytes Target:ĪCCEPT – Allows a packet.( Accept the incoming/outgoing connection )ĭROP – Drops a packet. –in-interface (-i) Input interface (e.g., eth0) –destination (-d) Destination IP address or network –source (-s) source IP address or network Raw tables are used only for packets processed with special conditions, such as exempt from connection tracking.Įvery iptables rule has a set of matches that tells the iptables what to do with a packet.It includes a Combination of NAT Tables & Chains.The mangle table can be used for special-purpose processing of packets.Forward Chain – Forwarding connections to specific networks or ports.Example: Port Forwarding.Example: If you’re trying to visit, user traffic is verified in chain rule to allow or deny the connection. Output Chain- Packets that are passed or outgoing connections from your system.Example: External IP trying to establish an SSH connection on your system. Input Chain – Incoming connections which are traversed from Prerouting.Chains are classified into 3 types INPUT CHAIN, OUTPUT CHAIN & FORWARD CHAIN.Packet filtering is processed with the below chain rules. Network Routing is processed with Pre-routing and Post-routing of packets from origination to destination.Network Address Translation ( NAT ) is processed for incoming packets and outgoing packets with routing decisions in the table.Iptables functionality classified into Four tables which are NAT table, packet filtering table, Mangle table, and Raw table. How Does Packet Filtering Work with Iptables?Īn iptables policy is built with an ordered set of rules, which describe to the kernel the actions that should be taken against certain types of packets. This is a packet filtering framework that does the same work of Iptables. Later Netfilter Project developed Nftables for performance and scalability. ![]()
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