cisco secure virtual private networks

... 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 ... 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 ... Practices Virtual Private Networks are convenient, but they can also create gaping security holes in your network. The following practices will help you avoid trouble. • Use a real firewall. • Secure...

... remote client an IP address. Chapter 16, “SecuRemote/SecureClient” SecuRemote/SecureClient is a method that allows you to connect to your organization in a secure manner, while at the same time ... 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 5 Contents Preface ... 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 for...

... 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...

... 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...

... 6.280.688  PIX Firewall .  Cisco VPN 3000 Concentrator.  Cisco Secure ACS (AAA). Cisco VPN 3002 Hardware VPN Client 17 Internet VPN Central Site Mobile Customer Telecommuter POP Cisco VPN Clients Microsoft ... 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 ... ống IP (IP tunnel). - Với GRE Tunnel, Cisco router sẽ đóng gói 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 ... khi lại đóng vai _________________________________________________________________________ VIRTUAL PRIVATE NETWORK (VPN) Nhóm 18 Lớp: DHTH3 GV: Th.s Nguyễn Hòa Danh sách: 1. Đặng Hồng Hải 2....

... review the Cisco Secure Policy Manager 3.1 documentation on Cisco. com for any updates. The following documents describe how to install and use CSPM: • Installation Guide for Cisco Secure Policy ... technical assistance with a Cisco product, technology, or solution. Two levels of support are available: the Cisco TAC Web Site and the Cisco TAC Escalation Center. Cisco TAC inquires are categorized ... CD-ROM. • User Guide for Cisco Secure Policy Manager 3.1—Describes how to configure and use CSPM. This document is also provided in PDF format on your product CD-ROM. • Release Notes for Cisco Secure Policy...

... validate it with a product such as Cisco Secure Scanner. B. Monitoring of the network should be done with a real-time intrusion detection device such as Cisco Secure Intrusion Detection System. ... with a product such as Cisco Secure Intrusion Detection System. D. Monitoring of the network should be done with a real-time intrusion detection device such as Cisco Secure Scanner. Answer: ... NAT simplify router configuration on your internal or perimeter networks? A. By controlling the addresses that appear on these networks. B. Because you can configure your routing within the...

... that 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 ... 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 like the Internet. A VPN enables ... facilitates the creation of VPNs from anywhere, networks need strong security features to prevent unwelcome access to private networks and to protect private data as it traverses the public network....