Abstract: The firewall provided by Linux based on the kernel netfilter framework is versatile and extensible, and implements a cost-effective security solution that can effectively prevent malicious attacks and has become the choice of many network security administrators. This article first introduces the main technologies of the firewall, and then introduces in detail the implementation principle of the Linux kernel firewall netfilter/Iptables, explaining how to use the Linux kernel netfilter and iptables to implement a packet filtering firewall to protect the security of the internal network. [Author Abstract]
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