「Linuxでファイアウォール設定といえばiptablesだけど、書き方が難しそう…」 「UFWは使ってるけど、CentOSやRockyではiptablesを直接設定する場合もある」 iptablesは、Linuxカーネルのパケットフィルタリング機能（netfilter）を使った最もベーシックな ...

$ iptables -L -n --line-number Chain INPUT (policy ACCEPT) num target prot opt source destination Chain FORWARD (policy ACCEPT) num target prot opt source destination ...

All modern operating systems come equipped with a firewall – a software application that regulates network traffic to a computer. Firewalls create a barrier between a trusted network (like an office ...

nftables provides a simpler, more efficient alternative to iptables, with unified IPv4/IPv6 handling. Features like rule tracing and multi-action rules in nftables enhance network management.

Mastering iptables could take a while, but if you have a few rules to cover the basic security needs, you'll be well on your way to protecting your Linux system. Jack Wallen explains some key rules to ...