Categories: Apache

What is IPtables in linux server ?

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:–––––
A – All source
I – INPUT
s – Source
j – jump on
–––––

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

You can see the result as below

DROP all — 192.99.204.1 0.0.0.0/0
DROP all — 0.0.0.0/0 192.99.204.1
Which means IP is blockedTo unblock that IP address use following command:

iptables -I INPUT -s 192.99.204.1 -j ACCEPT
To Block back an IP Address:
iptables -A INPUT -d 192.99.204.1 -j DROP

After adding or removing ips from iptables you need to save iptable rule using following command.
service iptables save
service iptables restart
To allow PORT in iptables you have to follow below commands Exact meaning of an options which uses in the command
=====================================
p – protocol
dport – destination port
j – jump on
=====================================

iptables -I INPUT -p tcp –dport 2082 -j ACCEPTiptables -I INPUT -p udp –dport 2082 -j ACCEPT

iptables -I OUTPUT -p tcp –dport 2082 -j ACCEPT

iptables -I OUTPUT -p udp –dport 2082 -j ACCEPT

To drop (block) port in iptables you have to follow below commands:
iptables -I INPUT -p tcp –dport 2082 -j DROP

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

After adding or removing iptables you need to save iptable rule using following command.
  • service iptables save
  • service iptables restart
To enable range of port in iptables
iptables -A INPUT -p tcp –destination-port 1568:1570 -j ACCEPTiptables -A OUTPUT -p tcp –source-port 1568:1570 -j ACCEPT
  • service iptables save

  • service iptables restart

Vishwajit Kale

Vishwajit Kale blazed onto the digital marketing scene back in 2015 and is the digital marketing strategist of Hostdens, a company that aims to provide reliable web hosting solutions. Vishwajit is experienced in digital and content marketing along with SEO. He's fond of writing technology blogs, traveling and reading.
View all posts
Vishwajit Kale

Vishwajit Kale blazed onto the digital marketing scene back in 2015 and is the digital marketing strategist of Hostdens, a company that aims to provide reliable web hosting solutions. Vishwajit is experienced in digital and content marketing along with SEO. He's fond of writing technology blogs, traveling and reading.

Leave a Comment
Leave a Comment
Share
Published by
Vishwajit Kale
Tags: $1 hosting1 dollar hostingcheap reconfigure iptablesiptableslinux server
9 years ago

Recent Posts

Green Data Centers To Have Strong Impact On Data Processing And Hosting Service Businesses

About Bizvibe Bizvibe is a B2B online platform that helps in connecting buyers and sellers…

3 years ago

File Server Security Is Important for An Organization: Find out How

File server investment is the smart investment anyone can make for their business. It has…

3 years ago

Cloud Computing Explained

Because of the many advantages of the cloud, people are moving more and more towards…

3 years ago

Cloud to which more and more companies are moving advanced workloads

Cloud Adoption Accelerates IT Modernization. More and more online businesses are increasing more and more…

3 years ago

History of web hosting

Almost more than half of the total world’s population were using the internet by any…

3 years ago

Plesk appoints ZNet Technologies as a global distributor to expand reach in untapped markets

Plesk is an IT service provider company which was founded in 2000 by Dimitri. The…

3 years ago

This website uses cookies.