Linux Network Stack for Engineers (iptables, nftables)

Linux network stack for engineers: netfilter, iptables, nftables

Packets traverse the kernel from the NIC through the IP stack; netfilter hooks let you filter, NAT, or mangle traffic. iptables is the classic frontend; nftables is the modern replacement with one engine and a simpler rule syntax. This lesson builds intuition before you touch production firewalls.

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