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changes.mady.by.user Guntis G.

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Firewall mangle rules consist of five predefined chains that cannot be deleted:


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  • The PREROUTING chain: Rules in this chain apply to packets as they just arrive on the network interface;
  • The INPUT chain: Rules in this chain apply to packets just before they’re given to a local process;
  • The OUTPUT chain: The rules here apply to packets just after they’ve been produced by a process;
  • The FORWARD chain: The rules here apply to any packets that are routed through the current host;
  • The POSTROUTING chain: The rules in this chain apply to packets as they just leave the network interface;

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