3/11/2023 0 Comments Human cargo vpn guideThis guide will assume the reader has existing knowledge of Active Directory Domain Services, Active Directory Certificate Services, DNS, and basic enterprise networking concepts. The goal of this series is to cover the deployment of a basic Always On VPN environment. The downsides to SSTP are that it is not quite as secure as IKEv2, and it does not handle connection interruptions as well. The main benefit of using SSTP is that communication happens on TCP 443, so it is very unlikely that it will be blocked anywhere. Secure Socket Tunneling Protocol (SSTP) also has good security, and good performance. Note that when using a Always On VPN device tunnel, IKEv2 is the only supported protocol. This makes it more likely that the connection will be blocked by firewalls. The primary concern with using IKEv2 is that communication happens on UDP 500 and UDP 4500. Its ability to automatically re-connect after a short interruption gives it good reliability as well. Internet Key Exchange version 2 (IKEv2) has good security and good performance. There are two main protocols that make the most sense to use when working with Always On VPN. VPN ProtocolsĪlways On VPN utilizes familiar VPN infrastructure, which means that it can also utilize familiar VPN protocols. For more guidance on when to utilize device tunnels refer to this post. This prevents device tunnels from taking advantage of more advanced Always On VPN features like conditional access and multi-factor authentication. The VPN server preforms the authentication. Notice that the device tunnel does not use RADIUS for authentication. The VPN server validates the computer authentication certificate of the client and allows or denies the connection request.Here is a high-level overview of the connection process for a Always On VPN device tunnel. This type of tunnel is ideal for granting access to Active Directory or other management servers like Configuration Manager. A user does not need to be logged into a computer for a device tunnel to connect. The Device Tunnel is established as soon as a computer is powered on and connected to the internet. The VPN server allows or denies the connection request based on the response from the RADIUS server.The RADIUS server returns an accept or deny response to the VPN server.The RADIUS server receives and authenticates the connection request.The connection request leaves via the internal interface of the VPN server and passes through the internal firewall The VPN server passes the connection request to the RADIUS server.The edge firewall passes the connection request to the external interface of the VPN server.The VPN client sends a connection request to the external IP address of the VPN server.Here is a high-level overview of the connection process for a Always On VPN user tunnel. This type of tunnel is ideal for granting access to file shares or applications. The User Tunnel is established when a user logs into a computer. Both types of tunnels can be connected simultaneously if required. The Windows 10 VPN client can be configured to connect a user authenticated tunnel or a device authenticated tunnel. The certificates will be used to authenticate the VPN connection. Additionally, a certificate authority is required to issue certificates to the servers and clients. The server side of a typical Always On VPN deployment requires at least one VPN server and one authentication (RADIUS) server. This CSP ( configuration service provider) allows the built-in Windows 10 VPN client to be configured using an MDM solution (Intune), or PowerShell. The technology that makes this possible is the VPNv2 CSP node, which is built into Windows 10. How Does Always On VPN Work?Īlways On VPN is a solution that allows a client to automatically establish a VPN connection without any user interaction. If you’re going to be deploying any sort of remote access solution, I recommend bookmarking his website. Additionally, throughout this series I reference a number of posts by Richard Hicks. I highly recommend reading through the official Microsoft Documentation. These are my notes based on my experiences working with Always On VPN. I want to preface this series by saying that I am not an expert on this topic. Links to each individual post in this series can be found below.Īlways On VPN – Certificates and Active DirectoryĪlways On VPN – VPN and NPS Server Configuration This guide will be split into multiple parts. This first post will cover the basics of the Always On VPN technology. With all the increased focus on working from home and remote access lately, I figured now would be a good time to share my notes on configuring Always On VPN.
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