cisco secure virtual private networks

Virtual Private Networks

... most modern VPNsystems 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 yournetwork. The following practices will help you avoid trouble.• Use a real firewall.• Secure...

Virtual Private Networks

Danh mục: Quản trị mạng

... 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.).Overview44Figure 2-2IKE Phase II Once the IPSec keys are created, bulk data transfer takes place: Virtual Private Networks Administration GuideVersion NGX R65701675 March 18, 2007Table of Contents 5ContentsPreface ... Period 81Configuring OCSP 82Chapter 4 Introduction to Site to Site VPN The Need for Virtual Private Networks 84Confidentiality 84Authentication 84Integrity 84The Check Point Solution for...

Tài liệu Cách thiết lập VPN (Virtual Private Networks) Client - Phần II pdf

Danh mục: Quản trị mạng

... 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...

Xây dựng và thiết kế hệ thống virtual private networks

Danh mục: Công nghệ thông tin

Tài liệu Configuring Virtual Private Networks pdf

Danh mục: Quản trị mạng

Tài liệu Analysis of the Security of BGP/MPLS IP Virtual Private Networks (VPNs) ppt

Danh mục: An ninh - Bảo mật

Tài liệu Virtual Private Networks doc

Danh mục: An ninh - Bảo mật

Tài liệu Cách thiết lập VPN (Virtual Private Networks) Client potx

Danh mục: Hệ điều hành

VIRTUAL PRIVATE NETWORKS (VPN) docx

Danh mục: An ninh - Bảo mật

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o'reilly - virtual private networks 2nd edition

Danh mục: An ninh - Bảo mật

a technical guide to ipsec virtual private networks

Danh mục: An ninh - Bảo mật

openvpn - building and integrating virtual private networks

Danh mục: Cơ sở dữ liệu

Tài liệu Module 8: Configuring Virtual Private Network Access for Remote Clients and Networks doc

Danh mục: Quản trị mạng

Virtual Private Network (VPN)

Danh mục: Kỹ thuật lập trình

... 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Protocols39TUNNELING PROTOCOLSLayer 2 Tunneling Protocol (L2TP)Provides better security through IPSecIPSec enables L2TP to performAuthenticationEncapsulationEncryption18TUNNELING 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 UDP2016ENCRYPTION 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 begins34SUMMARY (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) 29BIếN 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 liệu153127VPN 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FWZ2812SUMMARY (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 risks412410255ENCRYPTION 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 DES30WHY 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 versatility13FIREWALL CONFIGURATION FOR VPNS37Protocol ... 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Protocols39TUNNELING PROTOCOLSLayer 2 Tunneling Protocol (L2TP)Provides better security through IPSecIPSec enables L2TP to performAuthenticationEncapsulationEncryption18TUNNELING 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 UDP2016ENCRYPTION 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 begins34SUMMARY (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) 29BIếN 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 liệu153127VPN 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FWZ2812SUMMARY (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 risks412410255ENCRYPTION 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 DES30WHY 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 versatility13FIREWALL CONFIGURATION FOR VPNS37Protocol ... 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Protocols39TUNNELING PROTOCOLSLayer 2 Tunneling Protocol (L2TP)Provides better security through IPSecIPSec enables L2TP to performAuthenticationEncapsulationEncryption18TUNNELING 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 UDP2016ENCRYPTION 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 begins34SUMMARY (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) 29BIếN 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 liệu153127VPN 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FWZ2812SUMMARY (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 risks412410255ENCRYPTION 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 DES30WHY 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 versatility13FIREWALL CONFIGURATION FOR VPNS37Protocol...

Virtual Private Network -mạng riêng ảo- VPN

Danh mục: Công nghệ thông tin

... 6.280.688 PIX Firewall . Cisco VPN 3000 Concentrator. Cisco Secure ACS (AAA). Cisco VPN 3002 Hardware VPN Client17Internet VPNCentral SiteMobileCustomerTelecommuterPOP Cisco VPN ClientsMicrosoft ... m¸y - In LuËn v¨n, TiÓu luËn : 6.280.688Lý thuyết. I. Tổng quan về mạng riêng ảo VPN (Virtual Private Network). II. VPN và bảo mật internet VPN. III. Thiết kế VPNI. Tổng quan về mạng ... để tiết kiệm được chi phí và thời gian. VPN ra đời đáp ứng tất cả các yêu cầu trênCụm từ Virtual Private Network gọi là mạng riêng ảo- VPN được khởi sự năm 1997.Mục đích mong muốn của công...

VIRTUAL PRIVATE NETWORK (VPN)

Danh mục: Công nghệ thông tin

... tunnel về mạng của họ.I. Giới Thiệu VPN1. Khái niệm- Mạng riêng ảo hay VPN (viết tắt cho Virtual Private Network) là mộtmạng 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 giaothức 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 18Lớp: DHTH3GV: Th.s Nguyễn HòaDanh sách:1. Đặng Hồng Hải2....

User Guide for Cisco Secure Policy Manager 3.1

Danh mục: Quản trị mạng

... 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...

Cisco Secure PIX Firewall Advanced Version 4.0

Danh mục: Chứng chỉ quốc tế

... 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...

Virtual Private Networking in Windows 2000: An Overview

Danh mục: Tin học văn phòng

... 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 Paper19USER 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 needstrong security features to prevent unwelcome access to private networks and to protect private data as it traverses the public network....

Cisco Secure PIX Firewall Advanced Version 7.0

Danh mục: Chứng chỉ quốc tế

... connection slot when a UDP packet is sent from a more secure interface to a less secure interface. Reference: Cisco Secure PIX Firewalls (Ciscopress) Page 68 QUESTION NO: 93 The two ends ... intrusion detection system, such as the Cisco Secure Intrusion Detection System can discover and prevent unauthorized entry. Reference: Cisco Secure PIX Firewalls (Ciscopress) page 11, 12 QUESTION ... 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....

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