easy learn linux command line-part 26

in this season, We will learn how to work with IP Table on the linux OS command line.

you can read more information about IP table here, if you cant know anythings about it.

IPTABLES (firewall)
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