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Linux Command Line version 1.4
Last modified date: 2008-11-15
Created Date: 2008-01-06

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IPTABLES (firewall)

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Command

Description

iptables -t filter -L

show all chains of filtering table

iptables -t nat -L

show all chains of nat table

iptables -t filter -F

clear all rules from filtering table

iptables -t nat -F

clear all rules from table nat

iptables -t filter -X

delete any chains created by user

iptables -t filter -A INPUT -p tcp --dport telnet -j ACCEPT

allow telnet connections to input

iptables -t filter -A OUTPUT -p tcp --dport http -j DROP

block HTTP connections to output

iptables -t filter -A FORWARD -p tcp --dport pop3 -j ACCEPT

allow POP3 connections to forward chain

iptables -t filter -A INPUT -j LOG --log-prefix

Logging on input chain

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

configure a PAT (Port Address Traslation) on eth0 masking outbound packets

iptables -t nat -A PREROUTING -d 192.168.0.1 -p tcp -m tcp --dport 22 -j DNAT --to-destination 10.0.0.2:22

redirect packets addressed to a host to another host

Commands by Argument

System information - Shutdown, Restart and Logout of a system - Files and Directory - File search - Mounting a Filesystem - Disk Space - Users and Groups - Permits on Files - Special Attributes on files - Archives and compressed files - RPM Packages ( Fedora, Red Hat and like) - YUM packages tool (Fedora, RedHat and alike) - DEB packages (Debian, Ubuntu and like) - APT packages tool (Debian, Ubuntu and alike) - View file content - Text Manipulation - Character set and Format file conversion - Filesystem Analysis - Format a Filesystem - Filesystem SWAP - Backup - CDROM - Networking (LAN / WiFi) - Microsoft Windows networks (samba) - IPTABLES (firewall) - Monitoring and debugging - Others useful commands - Pacman packages tool (Arch, Frugalware and alike) -

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