25. iptables: Setting Up a Firewall

The iptables utility builds and manipulates network packet filtering rules in the Linux kernel. You can use iptables to create a firewall that protects a system from malicious users and to set up NAT (Network Address Translation, page 1095), which can allow multiple systems to share a single Internet connection. The iptables utility is flexible and extensible, allowing you to set up both ...

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