225 virtual private networking

... emulates the properties of a point-to-point private link. The act of configuring and creating a virtual private network is known as virtual private networking. To emulate a point-to-point link, ... connection in which the private data is encapsulated is known as the tunnel. The portion of the connection in which the private data is encrypted is known as the virtual private network (VPN) ... to split Microsoft VPN Overview White Paper 19 USER ADMINISTRATION A virtual private network (VPN) is the extension of a private network that encompasses links across shared or public networks...

... You're on your way to joining the corporate network—from thousands of miles away. Virtual private networking is ideal for the paranoid (because it's very secure) and the cheap (because ... "Select an interface" sheet appears. 2. From the pop-up menu, choose VPN. 22.5. Virtual Private Networking After reading the previous pages, you might assume that it's a piece of ... check out.) Fortunately, there's a third solution that's both secure and cheap: the Virtual Private Networke, or VPN. Running a VPN allows you to create a super-secure "tunnel"...

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... 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...

... m¸y - In LuËn v¨n, TiÓu luËn  : 6.280.688 Lý thuyết.  I. Tổng quan về mạng riêng ảo VPN (Virtual Private Network).  II. VPN và bảo mật internet VPN.  III. Thiết kế VPN I. Tổng quan về mạng ... để tiết kiệm được chi phí và thời gian. VPN ra đời đáp ứng tất cả các yêu cầu trên Cụm từ Virtual Private Network gọi là mạng riêng ảo- VPN được khởi sự năm 1997. Mục đích mong muốn của công...

... tunnel về mạng của họ. I. Giới Thiệu VPN 1. Khái niệm - Mạng riêng ảo hay VPN (viết tắt cho Virtual Private Network) là một mạng dành riêng để kết nối các máy tính của các công ty, tập đoàn hay ... khi lại đóng vai _________________________________________________________________________ VIRTUAL PRIVATE NETWORK (VPN) Nhóm 18 Lớp: DHTH3 GV: Th.s Nguyễn Hòa Danh sách: 1. Đặng Hồng Hải 2. ... cho mỗi vị trí một giao thức đặc trưng chỉ định trong gói IP header, tạo một đường kết nối ảo (virtual point- IV. Kết Luận - Hiện nay xu hướng các công ty có nhiều chi nhánh là phổ biến, do nhu cầu...

... However, most modern VPN systems are combined with firewalls in a single device. Virtual Private Networking Explained Virtual Private Networks solve the problem of direct Internet access to servers through ... encrypts its private key using the random number and sends it to the remote host. The remote host decrypts the private key using its kept random number, and compares the private key to its private ... inside that connection rather than forwarding it. IP over IP (or IP/IP) is useful for virtual networking, so that private IP addresses (in the 192.168.0.0 range, for example) can be passed over the...

... TTDL & Mạng máy tính Trang 62 4. Trên trang Connection type chọn Connect using virtual private networking (VPN). 5. Nhấn Next. Trên trang VPN Type chọn Point-to-Point Tunneling Protocol ... Mô phỏng & Truyền số liệu Thí nghiệm TTDL & Mạng máy tính Trang 49 BAØI 3 : VPN (VIRTUAL PRIVATE NETWORK) I. Lý thuyết chung cho VPN • VPN cung cấp kết nối mạng với khoảng cách dài. ... thoại Connect VPN Client hiện ra. 13. Nhấn vào mục Properties rồi nhấn vào thẻ Networking. 14. Trên thẻ Networking, ở Type of VPN, nhấn PPTP VPN. Phòng thí nghiệm Mô phỏng & Truyền số...

... etc.). Overview 44 Figure 2-2 IKE Phase II Once the IPSec keys are created, bulk data transfer takes place: Virtual Private Networks Administration Guide Version NGX R65 701675 March 18, 2007 Table of Contents ... Grace Period 81 Configuring OCSP 82 Chapter 4 Introduction to Site to Site VPN The Need for Virtual Private Networks 84 Confidentiality 84 Authentication 84 Integrity 84 The Check Point Solution ... Converter Handles Disabled Rules 653 After Running the Wizard 653 Appendix C VPN Shell Configuring a Virtual Interface Using the VPN Shell 656 Index 665 19 Preface P Preface In This Chapter Who...

... tập 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 ... 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...

... Cisco IOS command syntax uses the more specific term virtual private dialup network (VPDN) instead of VPN. Enables VPN. Configuring Virtual Private Networks Verifying VPN Sessions DNC-176 Cisco ... 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 ... both routers. Configuring Virtual Private Networks VPN Technology Overview DNC-152 Cisco IOS Dial Services Configuration Guide: Network Services Traditional dialup networking services only support...

... model is deployed? mp900725.eps 87050021 07/15/00 steve gifford Virtual Networks Virtual Private Networks Virtual Dial-up Networks Virtual LANs Overlay VPN Peer-to-Peer VPN Layer 2 VPN Layer 3 ... Jose Amsterdam Washington Atlanta Paris London Virtual circuits (Frame Relay DLCI) CH08 Page 149 Wednesday, February 19, 2003 4:23 PM 130 Chapter 8: Virtual Private Network (VPN) Implementation Options ... site Distribution -layer router Remote site (spoke) CH08 Page 147 Wednesday, February 19, 2003 4:23 PM 144 Chapter 8: Virtual Private Network (VPN) Implementation Options • Extranet topologies, which include any-to-any...

... BGP/MPLS IP VPNs February 2006 [11] Fang, L., "Security Framework for Provider-Provisioned Virtual Private Networks (PPVPNs)", RFC 4111, July 2005. [12] Behringer, M., Guichard, J., and ... Systems Inc Category: Informational February 2006 Analysis of the Security of BGP/MPLS IP Virtual Private Networks (VPNs) Status of This Memo This memo provides information for the Internet ... 3932 for more information. Abstract This document analyses the security of the BGP/MPLS IP virtual private network (VPN) architecture that is described in RFC 4364, for the benefit of service...

... • 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 ... IPSec+IKE work together • make sure that remote clients software works with your firewall VPN • Virtual Private Networks CS-480b Dick Steflik ... most OSs • compatible with with: – SSL/TLS – RSA Certificates – X509 PKI – NAT – DHCP – TUN/TAP virtual devices CCEVS • Common Criteria Evaluation and Validation Scheme • jointly managed activity...