Building Linux Virtual Private Networks Vpns

The authors meet the growing demands of de-centralized companies that need a secure and functional network using Linux. The only book available that extensively covers the combination of VPN technology and Linux, this volume teaches first hand how to build various VPN solutions with individual setup guides.

Learn how to build secure VPNs using this powerful Open Source application.

Historically, only large companies could afford secure networks, which they created from expensive leased lines. Smaller folks had to make do with the relatively untrusted Internet. Nowadays, even large companies have to go outside their private nets, because so many people telecommute or log in while they're on the road. How do you provide a low-cost, secure electronic network for your organization?The solution is a virtual private network: a collection of technologies that creates secure connections or "tunnels" over regular Internet lines--connections that can be easily used by anybody logging in from anywhere. A number of products now exist to help you develop that solution.This book tells you how to plan and build a VPN. It starts with general concerns like costs, configuration, and how a VPN fits in with other networking technologies like firewalls. It continues with detailed descriptions of how to install and use VPN technologies that are available for Windows NT and Unix, such as PPTP and L2TP, Altavista Tunnel, Cisco PIX, and the secure shell (SSH).New features in the second edition include SSH, which is a popular VPN solution for Unix systems, and an expanded description of the IPSec standard, for which several vendors have announced support.Topics include: How the VPN compares to other available networking technologies Introduction to encryption, firewalls, the IPSec standard, and other technologies that let VPNs work Point to Point Tunneling Protocol (PPTP) and L2TP The Altavista Tunnel The Cisco PIX Firewall Secure Shell (SSH) Maintenance and troubleshooting

Network administrators and any one who is interested in building secure VPNs using Openswan. It presumes basic knowledge of Linux, but no knowledge of VPNs is required.

Für weltweit tätige Unternehmen gewinnt die Übertragung von Daten, Sprache und Video über virtuelle private Netzwerke (VPN) an Bedeutung. Die Einrichtung von einem Virtuellen Privaten Netzwerk (VPN) ermöglicht es den Nutzern über jede Telefondose oder jedes Wireless LAN auf ihren Arbeitsplatz zuzugreifen über eine sichere Verbindung. Über VPN können sichere und kostengünstige unternehmensweite Netzwerke aufgebaut werden, die sich das öffentliche Netz (Internet) zu Nutze machen. Die Einrichtung eines VPN ist problemlos und inzwischen insbesondere auch für kleinere und mittelgroße Unternehmen erschwinglich.

Master building and integrating secure private networks using OpenVPN About This Book Discover how to configure and set up a secure OpenVPN Enhance user experience by using multiple authentication methods Delve into better reporting, monitoring, logging, and control with OpenVPN Who This Book Is For If you are familiar with TCP/IP networking and general system administration, then this book is ideal for you. Some knowledge and understanding of core elements and applications related to Virtual Private Networking is assumed. What You Will Learn Identify different VPN protocols (IPSec, PPTP, OpenVPN) Build your own PKI and manage certificates Deploy your VPN on various devices like PCs, mobile phones, tablets, and more Differentiate between the routed and bridged network Enhance your VPN with monitoring and logging Authenticate against third-party databases like LDAP or the Unix password file Troubleshoot an OpenVPN setup that is not performing correctly In Detail Security on the internet is increasingly vital to both businesses and individuals. Encrypting network traffic using Virtual Private Networks is one method to enhance security. The internet, corporate, and “free internet” networks grow more hostile every day. OpenVPN, the most widely used open source VPN package, allows you to create a secure network across these systems, keeping your private data secure. The main advantage of using OpenVPN is its portability, which allows it to be embedded into several systems. This book is an advanced guide that will help you build secure Virtual Private Networks using OpenVPN. You will begin your journey with an exploration of OpenVPN, while discussing its modes of operation, its clients, its secret keys, and their format types. You will explore PKI: its setting up and working, PAM authentication, and MTU troubleshooting. Next, client-server mode is discussed, the most commonly used deployment model, and you will learn about the two modes of operation using "tun" and "tap" devices. The book then progresses to more advanced concepts, such as deployment scenarios in tun devices which will include integration with back-end authentication, and securing your OpenVPN server using iptables, scripting, plugins, and using OpenVPN on mobile devices and networks. Finally, you will discover the strengths and weaknesses of the current OpenVPN implementation, understand the future directions of OpenVPN, and delve into the troubleshooting techniques for OpenVPN. By the end of the book, you will be able to build secure private networks across the internet and hostile networks with confidence. Style and approach An easy-to-follow yet comprehensive guide to building secure Virtual Private Networks using OpenVPN. A progressively complex VPN design is developed with the help of examples. More advanced topics are covered in each chapter, with subjects grouped according to their complexity, as well as their utility.

The only reference guide for system administrators using Open Source applications to configure a VPNl; Virtual private networks (VPNs) operate as private, secured networks that connect remote users or networks over a public connection. With the emergence of VPNs and the extreme popularity of Open Source operating systems like Linux, it is apparent that these two tools are natural complements for networking success in the twenty-first century. Now, instead of spending hours searching for answers on the Web for the latest Open Source VPN solutions Building Open Source VPNs will provide system administrators with everything they need. The book is ideal for system administrators who are responsible for installing, configuring and troubleshooting a virtual private network in the Open Source environment. This unique and comprehensive reference guide examines the wide array of Open Source tools and techniques available for VPN deployment, security and maintenance on both server and client machines.