![]() ![]() This article introduces you to IPsec concepts and provides a basic configuration to create a VPN between two machines. There are too many different ways to configure a network, a computer, and a VPN to cover in one article. However, the NetworkManager-libreswan package enables users running Linux to easily connect to your VPN in road warrior mode (asymmetric encryption intended for remote workers). It’s a peer-to-peer technology, so there isn’t a differentiation between client and server, which means that the Libreswan package provides everything you need to set it up. It also sets an expiry time for those keys and generates new ones before old channels die, so data can continue to flow seamlessly. The IKE resolves authentication and then dynamically generates the keys used by the kernel. For encryption keys to authenticate to one another, and for the algorithms to be negotiated, an Internet Key Exchange (IKE) daemon is required. On modern Linux, IPsec support is included in the kernel, so all you have to do to configure the tunnel is set up an encryption key, and define which IP addresses to protect on both hosts. IPsec is a complex suite of protocols, but it mainly manages the moving of encrypted data between two peers. Red Hat Enterprise Linux 8 (RHEL 8) comes with the open source IPsec Libreswan software already installed. VPN is a generic term, and there are many different VPN software packages available. This fact means that your users can work remotely from home or a different office location, but log in to your official LAN and use all of its services (file shares, printers, internal wikis, and so on) just as if they were physically sitting in the same room. A Virtual Private Network (VPN) creates a unique, private network within a different network.
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