iptables is a user-space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall (implemented as different Netfilter modules) and the chains and rules it stores.
Exact meaning of an option which are used in iptable command:
Procedure:
For Example: If you want to check IP 192.99.204.1 is blocked or not then fire command
iptables -nL | grep 192.99.204.1
Which means IP is blockedTo unblock that IP address use following command:
DROP all — 192.99.204.1 0.0.0.0/0
DROP all — 0.0.0.0/0 192.99.204.1
To Block back an IP Address:
iptables -I INPUT -s 192.99.204.1 -j ACCEPT
iptables -A INPUT -d 192.99.204.1 -j DROP
service iptables save
service iptables restartTo allow PORT in iptables you have to follow below commands Exact meaning of an options which uses in the command
To drop (block) port in iptables you have to follow below commands:
iptables -I INPUT -p tcp –dport 2082 -j ACCEPTiptables -I INPUT -p udp –dport 2082 -j ACCEPTiptables -I OUTPUT -p tcp –dport 2082 -j ACCEPT
iptables -I OUTPUT -p udp –dport 2082 -j ACCEPT
iptables -I INPUT -p tcp –dport 2082 -j DROPAfter adding or removing iptables you need to save iptable rule using following command.iptables -I INPUT -p udp –dport 2082 -j DROP
iptables -I OUTPUT -p tcp –dport 2082 -j DROP
iptables -I OUTPUT -p udp –dport 2082 -j DROP
iptables -A INPUT -p tcp –destination-port 1568:1570 -j ACCEPTiptables -A OUTPUT -p tcp –source-port 1568:1570 -j ACCEPT
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