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Deploying Remote Access VPNs
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In 5, Remote Access VPN Components and Design Points, we described the components and design points for remote access virtual private network (VPNs) using the Microsoft Windows Server 2003 and Windows XP family of operating sys tems. Now we ll get into the nuts and bolts of implementing remote access VPNs. We ll step through the deployment of Point-to-Point Tunneling Protocol (PPTP) and Layer Two Tunneling Protocol with Internet Protocol Security (L2TP/IPSec) remote access VPN solutions. There are many areas to cover to ensure proper deployment: set up of clients, servers, authentication systems (both Remote Authentication DialIn User Service [RADIUS] and Windows based), name resolution services, remote access policies, securing communications between the internal resources, and other fine-tuning. Our suggestion is to read through this chapter first so that you know what you ll encounter during your deployment that way you can first make your choices of what and what not to deploy, and then come back to the beginning of the chapter and take it step by step. Does it seem overwhelming It can be, but if you take each piece step by step as we have outlined here, you should get through it and if you have problems, the following chapters give you a complete outline and detailed procedures on how to troubleshoot the installation and operations. In previous chapters, we covered security and deployment options and choices you need to make. Those chapters covered the pros and cons of two specific VPN pro tocols sets and how to decide which to deploy, so by now you should have a good idea which protocols to deploy for your organization. Due to the similarities of the deployments of a PPTP or L2TP/IPSec VPN solution, we will go through the pro cess of remote access VPN deployment and point out where there are differences between the deployment of L2TP/IPSec and PPTP in the process. We are going to use certificates for the overall deployment because no matter which tunneling pro tocol you choose, certificates make for the most secure installation.
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Many deployment procedures for remote access are the same whether you are using PPTP or L2TP/IPSec, but you need to watch for several subtleties during the setup, depending on which one you want to use. When there is a difference between PPTP and L2TP/IPSec in the procedures, we have bolded the text to highlight these points. Make sure to watch for these items. Regardless of the protocol set you use, deploying remote access VPN connections using Windows Server 2003 consists of the following steps:
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Deploy an Internet infrastructure Deploy an authentication, authorization, and accounting (AAA) infrastructure Deploy VPN servers Deploy an intranet infrastructure Deploy VPN clients
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These steps are discussed in more detail in the sections that follow.
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Deploying a Certificate Infrastructure
For PPTP-based VPN connections, a certificate infrastructure is needed only when you are using either smart cards or locally installed user certificates and Extensible Authentication Protocol-Transport Layer Security (EAP-TLS) authentica tion. For L2TP/IPSec, the certificate infrastructure is mandatory. If you are using only a password-based authentication protocol such as Microsoft Challenge-Handshake Authentication Protocol version 2 (MS-CHAP v2), a certificate infrastructure is not required and is not used for the creation of the VPN connection. You can make the choice of using only passwords, but certificates allow for two-factor authentica tion and will enable you to use security technologies that take advantage of IPSec. This is a wise choice if you have the ability to go this route, and it is the solution recommended by Microsoft for security and authentication versatility. To use a certificate infrastructure for PPTP-based VPN connections, you must install a computer certificate on the authenticating server (the VPN server or the RADIUS server) and either a certificate on each smart card distributed to VPN client users or a user certificate on each VPN client computer. There are two kinds of certificates to use for remote access communications: computer and user certificates. Computer certificates are needed when using L2TP/IPSec because they allow for the two end nodes (client and server) to create an encrypted IPSec session between them, and
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