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icmp-reachable
![Basic Netfilter Function Block Diagram [KPTree Wiki]](https://wiki.kptree.net/lib/exe/fetch.php?w=600&tok=e59130&media=linux_router:linux_netfilter.png "Basic Netfilter Function Block Diagram [KPTree Wiki]")
Basic Netfilter Function Block Diagram [KPTree Wiki]
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Linux 25 Iptables Netfilter Firewall Examples - nixCraft
