openvpn building and integrating virtual private networks ebook

Ngày tải lên: 07/04/2014, 15:38

Ngày tải lên: 06/07/2014, 15:29

... The remote host decrypts the private key using its kept random number, and compares the private key to its private key (or list of keys, called a key−ring). If the private key does not match, ... throughout the day. 163 Virtual Private Networks Overview Using the Internet to link LANs and give remote computers LAN access causes serious security, performance, reliability, and management problems. ... passwords. The solution to this problem is Virtual Private Networks (VPNs). VPNs are a cost effective way to− extend your LAN over the Internet to remote networks and remote client computers. VPNs use...

Ngày tải lên: 29/09/2013, 13:20

... availability and load sharing solution for VPN connections between peer gateways and remote access clients. Chapter 27, “Userc.C and Product.ini Configuration Files” How to edit the Userc.c and Product.ini ... encryption keys, and exchange encrypted packets. IPSec is an encryption technology framework which supports several standards to provide authentication and encryption services of data on a private ... 630 Configuring the Client 633 Appendices Appendix A VPN Command Line Interface VPN Commands 638 SecureClient Commands 640 Desktop Policy Commands 642 Appendix B Converting a Traditional Policy to...

Ngày tải lên: 06/11/2013, 00:15

... cho các học viên lớp MCSA - www.athenavn.com Cách thiết lập VPN (Virtual Private Networks) Client - Phần II Virtual Private Networks (VPN) hay gọi theo tiếng Việt là Mạng Riêng Ảo, cho phép ... Properties, double click vào Make New Connection, sau đó click Next 2. Chọn vào Connect to private network through the Internet theo hình dưới đây. 3. Nếu bạn chưa kết nối với internet...

Ngày tải lên: 21/12/2013, 20:15

Ngày tải lên: 27/12/2013, 21:02

... Configuration Guide: Network Services Configuring Virtual Private Networks This chapter describes how to configure, verify, maintain, and troubleshoot a Virtual Private Network (VPN). It includes the following ... request-dialout commands have subgroup commands that are used to specify such information as the tunneling protocol and dialer resource. Table 16 lists the new VPN subgroup commands and which command modes ... dialin and/ or request dialout. 2. NAS VPN groups can be configured for accept dialout and/ or request dialin. Table 17 VPN Group Commands (continued) Command VPN Subgroups Configuring Virtual Private...

Ngày tải lên: 24/01/2014, 10:20

... continued strong support, and Eric Rosen, Loa Andersson, Alexander Renner, Jim Guichard, Monique Morrow, Eric Vyncke, and Steve Simlo, for their extended feedback and support. 10. Normative ... E. and Y. Rekhter, "BGP/MPLS IP Virtual Private Networks (VPNs)", RFC 4364, February 2006. 11. Informative References [2] Rekhter, Y., Moskowitz, R., Karrenberg, D., Groot, G., and ... Security of BGP/MPLS IP Virtual Private Networks (VPNs) Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution...

Ngày tải lên: 14/02/2014, 16:20

... • mesh of hubs • star of hubs Virtual Private Networks (VPNs) • Used to connect two private networks together via the Internet • Used to connect remote users to a private network via the Internet • This ... techniques, and assurance metrics; • Support a framework for international recognition and acceptance of IT security testing and evaluation results; and • Facilitate the development and growth ... and use of evaluated IT products and systems; • Champion the development and use of national and international standards for IT security; • Foster research and development in IT security requirements...

Ngày tải lên: 17/02/2014, 14:20

... vì nó không đòi hỏi certificate hay là PKI (Public Key Infrastructure) như L2TP. Virtual Private Networks (VPN) hay gọi theo tiếng Việt là Mạng Riêng Ảo, cho phép bạn mở rộng phạm vi mạng ... dial the initial connection theo hình dưới đây và Click Next Cách thiết lập VPN (Virtual Private Networks) Client ... Properties, double click vào Make New Connection, sau đó click Next 2. Chọn vào Connect to private network through the Internet theo hình dưới đây. 3. Nếu bạn chưa kết nối với internet...

Ngày tải lên: 26/02/2014, 14:20

Ngày tải lên: 15/03/2014, 16:20

Ngày tải lên: 25/03/2014, 10:53

Ngày tải lên: 25/03/2014, 11:03

Ngày tải lên: 27/06/2014, 00:20

Ngày tải lên: 11/07/2014, 10:16

Ngày tải lên: 27/02/2014, 05:20

... cellular networks [20–22], which targets the market of 2010 and beyond. The unified platform envi- sioned for 4G wireless networks will provide transparent integration with the wired networks and enable ... transmitter and the Wireless Networks3 6 LMDS and MMDS are discussed in this chapter. MMDS networks utilize a single omni- directional central antenna that can provide MMDS service to an area faster and ... spectrum was also used inside the European Union by Holland, Germany, Belgium and Austria. Italy and Ireland used a combination of auction and comparative bidding with the winners of comparative...

Ngày tải lên: 13/09/2012, 10:21

... Evolution (EDGE), cdma2000 and wideband CDMA (WCDMA)) are discussed. Chapter 6 provides a vision of 4G and beyond mobile and wireless systems. Such systems target the market of 2010 and beyond, aiming ... layer and the MAC protocols of two wireless local area network standards, IEEE 802.11 and ETSI HIPERLAN 1. Further- more, it discusses the latest developments in the field of wireless local area networks. Chapter ... of data networks in terms of size, performance and cost. PANs target applications that demand short-range communications. After a brief introduction, Chapter 11 covers the Bluetooth and HomeRF...

Ngày tải lên: 29/09/2013, 21:20

Ngày tải lên: 06/03/2014, 12:20

... SUMMARY  VPNs do not make use of dedicated  leased lines  VPNs send data through a secure tunnel  that leads from one endpoint to another   VPNs keep critical business  communications private and secure  VPN components  VPN servers  VPN clients  Protocols 39 TUNNELING PROTOCOLS  Layer 2 Tunneling Protocol (L2TP)  Provides better security through IPSec  IPSec enables L2TP to perform  Authentication  Encapsulation  Encryption 18 TUNNELING PROTOCOLS  Secure Shell (SSH)  Provides authentication and encryption  Works with UNIX­based systems  Versions for Windows are also available  Uses public­key cryptography  Socks V. 5  Provides proxy services for applications   That do not usually support proxying  Socks version 5 adds encrypted authentication and support for UDP 20 16 ENCRYPTION SCHEMES USED BY  VPNS (CONTINUED)  Secure Sockets Layer (SSL) (continued)  Steps  Server uses its private key to decode pre­master code  Generates a master secret key  Client and server use it to generate session keys  Server and client exchange messages saying handshake is  completed  SSL session begins 34 SUMMARY (CONTINUED)  VPN types  Site­to­site  Client­to­site  Encapsulation encloses one packet within  another   Conceals the original information  VPN protocols  Secure Shell (SSH)  Socks version 5  Point­to­Point Tunneling Protocol (PPTP)  Layer 2 Tunneling Protocol (L2TP) 40 Virtual Private Network  (VPN)  29 BIếN ĐổI ĐÓNG GÓI TRONG VPN  (ENCAPSULATION)  Các buớc trong tiến trình VPN   Đóng gói (Encapsulation)  Mã hoá (Encryption)  Xác thực (Authentication)  Encapsulation  Đóng gói dữ liệu và các thông số khác nhau  Ví dụ như IP header  Bảo vệ tính nguyên vẹn dữ liệu 15 31 27 VPN CORE ACTIVITY 2: ENCRYPTION  Encryption  Process of rendering information unreadable  by all but the intended recipient  Components  Key  Digital certificate  Certification Authority (CA)  Key exchange methods  Symmetric cryptography  Asymmetric cryptography  Internet Key Exchange  FWZ 28 12 SUMMARY (CONTINUED)  IPSec/IKE  Encryption makes the contents of the  packet unreadable  Authentication ensures participating  computers are authorized users  Kerberos: strong authentication system  VPN advantages  High level of security at low cost  VPN disadvantages  Can introduce serious security risks 41 24 10 25 5 ENCRYPTION SCHEMES USED BY  VPNS  Triple Data Encryption Standard (3DES)  Used by many VPN hardware and software  3DES is a variation on Data Encryption Standard  (DES)  DES is not secure  3DES is more secure  Three separate 64­bit keys to process data  3DES requires more computer resources than DES 30 WHY ESTABLISH A VPN?  VPN combinations  Combining VPN hardware with software adds  layers of network security  One useful combination is a VPN bundled with a  firewall  VPNs do not eliminate the need for firewalls  Provide flexibility and versatility 13 FIREWALL CONFIGURATION FOR  VPNS 37 Protocol ... SUMMARY  VPNs do not make use of dedicated  leased lines  VPNs send data through a secure tunnel  that leads from one endpoint to another   VPNs keep critical business  communications private and secure  VPN components  VPN servers  VPN clients  Protocols 39 TUNNELING PROTOCOLS  Layer 2 Tunneling Protocol (L2TP)  Provides better security through IPSec  IPSec enables L2TP to perform  Authentication  Encapsulation  Encryption 18 TUNNELING PROTOCOLS  Secure Shell (SSH)  Provides authentication and encryption  Works with UNIX­based systems  Versions for Windows are also available  Uses public­key cryptography  Socks V. 5  Provides proxy services for applications   That do not usually support proxying  Socks version 5 adds encrypted authentication and support for UDP 20 16 ENCRYPTION SCHEMES USED BY  VPNS (CONTINUED)  Secure Sockets Layer (SSL) (continued)  Steps  Server uses its private key to decode pre­master code  Generates a master secret key  Client and server use it to generate session keys  Server and client exchange messages saying handshake is  completed  SSL session begins 34 SUMMARY (CONTINUED)  VPN types  Site­to­site  Client­to­site  Encapsulation encloses one packet within  another   Conceals the original information  VPN protocols  Secure Shell (SSH)  Socks version 5  Point­to­Point Tunneling Protocol (PPTP)  Layer 2 Tunneling Protocol (L2TP) 40 Virtual Private Network  (VPN)  29 BIếN ĐổI ĐÓNG GÓI TRONG VPN  (ENCAPSULATION)  Các buớc trong tiến trình VPN   Đóng gói (Encapsulation)  Mã hoá (Encryption)  Xác thực (Authentication)  Encapsulation  Đóng gói dữ liệu và các thông số khác nhau  Ví dụ như IP header  Bảo vệ tính nguyên vẹn dữ liệu 15 31 27 VPN CORE ACTIVITY 2: ENCRYPTION  Encryption  Process of rendering information unreadable  by all but the intended recipient  Components  Key  Digital certificate  Certification Authority (CA)  Key exchange methods  Symmetric cryptography  Asymmetric cryptography  Internet Key Exchange  FWZ 28 12 SUMMARY (CONTINUED)  IPSec/IKE  Encryption makes the contents of the  packet unreadable  Authentication ensures participating  computers are authorized users  Kerberos: strong authentication system  VPN advantages  High level of security at low cost  VPN disadvantages  Can introduce serious security risks 41 24 10 25 5 ENCRYPTION SCHEMES USED BY  VPNS  Triple Data Encryption Standard (3DES)  Used by many VPN hardware and software  3DES is a variation on Data Encryption Standard  (DES)  DES is not secure  3DES is more secure  Three separate 64­bit keys to process data  3DES requires more computer resources than DES 30 WHY ESTABLISH A VPN?  VPN combinations  Combining VPN hardware with software adds  layers of network security  One useful combination is a VPN bundled with a  firewall  VPNs do not eliminate the need for firewalls  Provide flexibility and versatility 13 FIREWALL CONFIGURATION FOR  VPNS 37 Protocol ... SUMMARY  VPNs do not make use of dedicated  leased lines  VPNs send data through a secure tunnel  that leads from one endpoint to another   VPNs keep critical business  communications private and secure  VPN components  VPN servers  VPN clients  Protocols 39 TUNNELING PROTOCOLS  Layer 2 Tunneling Protocol (L2TP)  Provides better security through IPSec  IPSec enables L2TP to perform  Authentication  Encapsulation  Encryption 18 TUNNELING PROTOCOLS  Secure Shell (SSH)  Provides authentication and encryption  Works with UNIX­based systems  Versions for Windows are also available  Uses public­key cryptography  Socks V. 5  Provides proxy services for applications   That do not usually support proxying  Socks version 5 adds encrypted authentication and support for UDP 20 16 ENCRYPTION SCHEMES USED BY  VPNS (CONTINUED)  Secure Sockets Layer (SSL) (continued)  Steps  Server uses its private key to decode pre­master code  Generates a master secret key  Client and server use it to generate session keys  Server and client exchange messages saying handshake is  completed  SSL session begins 34 SUMMARY (CONTINUED)  VPN types  Site­to­site  Client­to­site  Encapsulation encloses one packet within  another   Conceals the original information  VPN protocols  Secure Shell (SSH)  Socks version 5  Point­to­Point Tunneling Protocol (PPTP)  Layer 2 Tunneling Protocol (L2TP) 40 Virtual Private Network  (VPN)  29 BIếN ĐổI ĐÓNG GÓI TRONG VPN  (ENCAPSULATION)  Các buớc trong tiến trình VPN   Đóng gói (Encapsulation)  Mã hoá (Encryption)  Xác thực (Authentication)  Encapsulation  Đóng gói dữ liệu và các thông số khác nhau  Ví dụ như IP header  Bảo vệ tính nguyên vẹn dữ liệu 15 31 27 VPN CORE ACTIVITY 2: ENCRYPTION  Encryption  Process of rendering information unreadable  by all but the intended recipient  Components  Key  Digital certificate  Certification Authority (CA)  Key exchange methods  Symmetric cryptography  Asymmetric cryptography  Internet Key Exchange  FWZ 28 12 SUMMARY (CONTINUED)  IPSec/IKE  Encryption makes the contents of the  packet unreadable  Authentication ensures participating  computers are authorized users  Kerberos: strong authentication system  VPN advantages  High level of security at low cost  VPN disadvantages  Can introduce serious security risks 41 24 10 25 5 ENCRYPTION SCHEMES USED BY  VPNS  Triple Data Encryption Standard (3DES)  Used by many VPN hardware and software  3DES is a variation on Data Encryption Standard  (DES)  DES is not secure  3DES is more secure  Three separate 64­bit keys to process data  3DES requires more computer resources than DES 30 WHY ESTABLISH A VPN?  VPN combinations  Combining VPN hardware with software adds  layers of network security  One useful combination is a VPN bundled with a  firewall  VPNs do not eliminate the need for firewalls  Provide flexibility and versatility 13 FIREWALL CONFIGURATION FOR  VPNS 37 Protocol...

Ngày tải lên: 17/09/2012, 10:44