... emulates the properties of a point-to-point private link.
The act of configuring and creating a virtualprivate 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 virtualprivate 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. Virtualprivatenetworking 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. VirtualPrivateNetworking
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 VirtualPrivate
Networke, or VPN. Running a VPN allows you to create a super-secure "tunnel"...
... 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 VirtualPrivate 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 VirtualPrivate 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 PrivateNetworking 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 virtualprivatenetworking (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 VirtualPrivate 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 virtualprivate dialup network (VPDN) instead of VPN.
Enables VPN.
Configuring VirtualPrivate Networks
Verifying VPN Sessions
DNC-176
Cisco ... Configuration Guide: Network Services
Configuring VirtualPrivate Networks
This chapter describes how to configure, verify, maintain, and troubleshoot a VirtualPrivate Network
(VPN). It includes the following ... both
routers.
Configuring VirtualPrivate Networks
VPN Technology Overview
DNC-152
Cisco IOS Dial Services Configuration Guide: Network Services
Traditional dialup networking services only support...
... 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
VirtualPrivate 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...