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* Text book: Chapter 13
= Concepts =
* Netfilter/iptables with iptables(legacy)* Netfilter/nftables with iptables(nt_tables)* firewallwith firewalld (front end for netfilter/iptables and netfilter/nftables)
= Command line tools =
* iptables
* ebtables
* nft
* firewall-cmd
= iptables =
* raw table
**FORWARD
**OUTPUT
== rules ==
<pre>
iptables -t filter -A INPUT -p tcp --dport 22 -j ACCEPT
where and when match spec. action
</pre>
= nft =
* table ip filter
* table ip security
* table ip raw
* table ip mangle
* table ip nat
* table inet firewalld
* tables ip firewalld
= man pages =
* man iptables
* man nft
* man firewall-cmd
