📦 Installation Command
apt install iptables iptables-persistent
iptables Firewall Rules & Configuration
iptables systemctl: netfilter-persistentClassic Linux packet filtering. Still widely used, being replaced by nftables.
🔌 Default Port
N/A
N/A
Packet filter
⚙️ Configuration Files
/etc/iptables/rules.v4/etc/iptables/rules.v6
📂 Default Directories
- config:
/etc/iptables - data:
N/A (kernel) - logs:
/var/log/syslog - rules:
/etc/iptables/rules.v4
🔐 Default Credentials
Username:N/A
Password:N/A
💡 Requires root
⚠️ Conflicts
✅ Works With
🛡️ Security Notes
Use iptables-persistent to save rules, always allow established connections first, log before drop
❓ Frequently Asked Questions
iptables vs UFW?
UFW is a frontend for iptables with simpler commands. iptables offers more control.
How to save iptables rules?
Run: sudo iptables-save > /etc/iptables/rules.v4 or use iptables-persistent package.
How to allow port in iptables?
Run: sudo iptables -A INPUT -p tcp --dport <port> -j ACCEPT