「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 ...

When deciding on a firewall implementation, most Unix-savvy administrators have usually chosen to use ipfilter on OpenBSD for their combination of capabilities and stability, as the capabilities of ...

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 ...

Let's talk about protecting your network from what people can fetch. I'm going to take a twisty road to get there, so please stick with me. I wrote a lengthy report ...

Iptables, more properly referred to as “iptables/netfilter” because of the two modules that are involved — the userspace module “iptables” and the kernel ...