How to install Openswan and create site- to- site VPN on Cent. OS 7. Openswan is an open source, user space IPsec implementation available in Red Hat Enterprise Linux 6/7. It employs the key establishment protocol IKE (Internet Key Exchange) v. Openswan interfaces with the Linux kernel using netlink to transfer the encryption keys. Packet encryption and decryption that happen in the Linux kernel. In this article We will be configuring our VPN connectivity with the help of IPSec(A technology used to encrypt traffic at network layer. In other words an entire IP packet is encrypted for security). IPSec is used for authentication as well as encryption of the complete communication that happens between two hosts on the internet. As IPSec works in network layer, traffic generated by all applications are by default encrypted and sent, hence there is no modification required to be done on the existing application to make it compatible with IPSec. In order for Openswan to create a site- to- site IPsec VPN, joining together two networks, an IPsec tunnel is created between two hosts, which are configured to permit traffic from one or more subnets to pass through. We will be using one such IPSec implementation in Linux for creating a tunnel between two private networks through the internet. There was a project called as Free- Swan, which was the first implementation of IPSec on Linux, but due to some reason, the project did not last long(the last version of free- swan was released at 2. ![]() Security-Enhanced Linux (SELinux) is a Linux kernel security module that provides a mechanism for supporting access control security policies, including United States. Ham Radio Software on Centos Linux - Configuring multitudes of Amateur / HAM Radio software for Centos6 / Centos5 Linux. MacBook Pros come with some very nice hardware, but some people want more. Some people want Linux. However the same code base was used to continue another IPSec project called Open. Swan. We will be using Open. Swan for making a secure VPN tunnel. Openswan IPSec package is released under GNU GPL licence, and is available for all linux distributions. Installing Openswan on Cent. OS 7. Let’s start the process by installing Openswan on your Cent. OS 7 servers. Usually, you will be managing Site- One only, but based on the requirements, you could be managing both site- One and site- Two. Login to your Cent. OS 7 server and run the following command on any RHEL based servers to install the package. This is very much useful because this helps in modifying the source ip of the packet. On Site One VPN server enter the below command. I POSTROUTING - o eth. MASQUERADE - s sit. Now we need to add a route which will allow them to reach the other 1. If your tunnel doesn’t come up, you can also check through the log file . VPN tunneling is mostly useful for its security benefit as large number of the Service providers and private companies design their networks in such a way that vital servers (e. Vo. IP, banking servers) are placed in a subnet that is accessible to trusted personnel through a VPN tunnel only. When a secure VPN tunnel is required, IPsec is often a preferred choice because an IPsec VPN tunnel is secured with multiple layers of security. I hope you are good to go with Site to site VPN setup on Cent. OS 7 with an ease. So don’t not forget to share your thoughts on this. Please follow and like us.
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August 2017
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