Networking & Firewall (Ss/Netstat/Iptables/Nftables/Curl)

Stop letting your firewall rules hide in plain sight

🧩 The Challenge

Dealing with a massive iptables list that looks like a bowl of spaghetti is the quickest way to ruin a Friday afternoon. You know the rule is there somewhere, but staring at five hundred lines of output makes your eyes glaze over.

💡 The Fix

Just use the line numbers flag when you list your rules so you can actually target them for deletion later. It saves you from having to type out the whole rule definition just to get rid of one entry.

iptables -L INPUT -n --line-numbers

⚙️ Why It Works

Adding that flag injects a simple index column at the start of every rule, turning a scavenger hunt into a direct reference. Now you can use the position number with the -D flag instead of copy-pasting strings that are prone to typos.

🚀 Pro-Tip: Pipe that output into grep if you are hunting for a specific source IP, but keep the line numbers flag active so you know exactly which rule to nuke.

Linux Tips & Tricks | © ngelinux.com | 11/10/2026