In a server environment is s very important to access servers with security. Data mining techniques arun k pujari 1st edition. To implement this network admins or security team allow specific network or a list of IPs to get connected. Now all the people with in the allowed network are allowed to do several tasks like maintenance work or for troubleshooting. But what would happen when you are not in the allowed network and it’s really urgent to get connect with servers.

• Centos 7 Network Configuration

Centos 7 Network Configuration

Here we have a need a VPN.What is OpenVPN?OpenVPN was first developed under OpenVPN project/OpenVPN Technologies, Inc. And it was originally developed by James Yonan using C language. Its initial release was 0.90 on date 13 May 2001. OpenVPN is an open-source software application which uses custom security protocol to set up a VPN by key exchange over SSL/TLS. It creates a secure point-to-point or site-to-site connections.

It also Works in routed or bridged configurations and remote access facilities. OpenVPN allows you to traverse through NATs and firewalls. Working of OpenVPN. OpenVPN allows connections from one network to another using a pre-shared secret key, certificates or username/password.

When there is a multi-client-server infrastructure architecture, it allows the server to release an authentication certificate for every client. It uses the OpenSSL encryption library extensively, as well as the SSLv3/TLSv1 protocol, and contains many security and control features.In this article, we will learn to set up OpenVPN.

For this scenario, we will use a system as OpenVPN server and two client system, One as a windows client and other as Linux client to test our work.Note: If you are a SUDO user then prefix every command with sudo, like #sudo ifconfigIf you want to read more article on OpenVPN then you may follow Given below linksPart 2:Part 3:Part 4:Part 5:Part 6: ScenarioOpenVPN server: 192.168.1.188Windows client: 192.168.1.18Linux client: 192.168.1.245 So Let’s startI did a lot of research and came up with an exact solution. I tried with many tuts present online but none of them was working perfect and without any flaw. So read it completely and do not miss any step. Step 1: Install Required Repo and packagesInstall EPEL repository and some other required packages using the following command yum install epel-release -yyum install openvpn iptables openssl wget ca-certificates -y Step 2: Setting UP Easy RSA for Key generationAfter packages installation, we need to set up Easy RSA for key generation purpose. This package creates certificates for server and client for secure communication.

Please follow given below steps. kapendra# wget 'kapendra# tar -xvzf EasyRSA-3.0.1.tgz kapendra# rm -rf EasyRSA-3.0.1.tgz kapendra# mv EasyRSA-3.0.1/ /etc/openvpn/easy-rsa kapendra# chown -R root:root /etc/openvpn/easy-rsa/ kapendra# cd /etc/openvpn/easy-rsa/ Step 3: Create PARAMs, Keys DH with server and client certificatesAfter EasyRSA set up we will create the PKI followed by setting up CA, the DH params and the server and client certificates using following commands.