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VPN wall art description:
virtual private network, that is, we usually say that the VPN wall, not a brand new network concept. As its name reveals, VPN circumvention can be defined as a use of public network facilities private network services. A typical example is a call. When we told friends to call when using the Public telephone network in between the two sides to establish a virtual private connection. VPN wall in two important concept is virtual and private. The so-called virtual, is with the real relative. In a real private network, so the network devices are affiliated with a company or Agency. While a virtual private network using a public network infrastructure, so it's not really private. The so-called private, refers to all of the real information to the outside world is not visible. Although both the communication using the public network, but can through information encryption means to ensure the security of data and private.< br>
first question: why to deploy a VPN over the wall
deploying a VPN over the wall the main reason is that it can save money. In the modern economic activities, many multinational companies around the world have their own branches and offices. They often need to be Business Communication and remote collaboration. In order to establish such a connection, there are only two ways: one is in each of the branches established between the private line, another method is to directly access the Internet, set up a public network the VPN over the wall. Obviously, the use of Internet solutions to be much more economical. If using a private leased line, the need in each of the two branches between the establishment of point-to-point connection. If there are n branches, then each branch requires at least n-1-th line. Such a composition of the private network not only complex, but also very expensive. Not an ordinary company can afford. And the use of the Internet solution is both simple and economic, each branch is only responsible for the own access to the nearest Internet node.< br>VPN circumvention technology description

the VPN over the wall, a Virtual Private Network a virtual private network, is defined as through a public network usually the Internet to establish a temporary, secure connection, is a public network through the security, stability tunnel. Virtual private network is an extension of the intranet,it can help remote users, company branches, business partners and suppliers with the company's internal network connection to establish credible security and ensure the security of data transmission.< br>
the IETF for IP-based VPN over the wall explanation is: through dedicated tunnels encryption technology in the public data network on a simulation of a point-to-point leased line technology. The so-called virtual, is the means that the user no longer needs to have actual long-distance data lines, but the use of the Internet public data network long-distance data line. The so-called private network is that users can set themselves one of the most in line with their needs of the network. Early private network generally refers to Telecom operators to provide Frame Relay or ATM virtual fixed line（PVC）service of the network, or by operators of the DDN network to build user's own private network.< br>
now the VPN is on the Internet the temporary establishment of a secure private virtual network, the user saves leased line costs, while in addition to the purchase VPN circumvention device or VPN software products, the companies paid only to the business location to the ISP to pay a certain cost of Internet access for different areas of Customer Contact also saves long distance charges. This is a VPN over the wall the low price of the reason.< br>
to the OSI model reference standard, different VPN circumvention technologies may be at different OSI Protocol Layer implementation.< br>in the following table: VPN wall in the OSI hierarchical VPN over the wall to achieve the
application Layer SSL VPN
session layer Socks5 VPN
network layer IPSec VPN
The Data Link Layer PPTP and L2TP


application layer VPN over the wall
SSL Protocol:
Secure Sockets Layer, Secure Socket Layer,SSL belonging to the high-level security mechanisms, widely used in the Web browser program and Web server program, providing peer-to-peer authentication and Application Data Encryption. In SSL, the authentication is certificate-based. Server direction client-side authentication is required, and the SSL version 3 customers in the direction of the service side of the Certification is only optional, but has not been widely applied. The SSL session contains a handshake phase, in this phase communication between the two sides to exchange a certificate, generates a session key negotiation after the communication using the encryption algorithm. The completion of the handshaking after the B/S application, the application can safely transfer data without having to make any major changes, except in the transmission of data to be called when the SSL API instead of the traditional socket API, but for the C/S structure of the application software, the solution with the session layer of the VPN similar.< br>SSL is an end-to-end Protocol, and thus is in the communication path endpoint on the machine to achieve, which is usually in the client and server, without the need for the communications path of intermediate nodes such as routers or firewalls. While in theory SSL can be used to protect TCP/IP communications, but in fact the SSL application is almost limited to HTTP. In SSL communication, the server-side using port 443, and the client-side port is optional.

The session layer VPN over the wall
Socks4 Protocol:
Socks in the OSI model the session layer, the Socks Protocol, the client program through a Socks client to the 1080 port through the firewall to initiate a connection establishment to the Socks server in the VPN tunnel, and then proxy application client and application server communication. In this framework, the Protocol can safely and transparently through the firewall, and the client program on the destination host is not visible, so it is better to hide the target host. SOCKS technology is the key to the client application for the Socks, added to the Socks Protocol support, then the server side and then parse the Socks of the results.< br>Socks4 Protocol, which is the TELNET, FTP, HTTP, WAIS and GOPHER and other TCP-based protocols does not include a UDP client/server program to provide a Certification is not required of the firewall, established a no-encryption and authentication VPN tunnel.< br>
Socks5 protocols:
Socks5 Protocol extension of the Socks4, to make it support UDP, TCP Framework provides the secure authentication scheme, the Address Resolution Scheme as specified in the IPv4, DNS and IPv6. In order to implement the Socks Protocol, usually need to re-compile or re-link TCP-based client applications to use the Socks library corresponding to the encryption function, and increase the data transmission integrity, data packet Compression Support.< br>network layer VPN wall technology

- IPSec protocols:
IPSec is IETF support for the standard one, and it is the first two it differs in that it is the third layer, i.e. IP layer encryption. IPSec is not some kind of special encryption algorithm or authentication algorithm, there is no in it a data structure specifying a particular encryption algorithm or authentication algorithm, it's just a open structure, defined in the IP data packet format, different encryption algorithms can use IPSec to define the system structure in the network data transmission process in the embodiment. the
IPSec Protocol can be set to operate in two modes: one is a tunnel, tunnel mode, one is a transmission(transport)mode. In tunnel mode, IPSec the IPv4 packet is encapsulated in a secure IP frame. The transmission mode is in order to protect the end-to-end security, i.e. in this mode does not hide routing information. Tunnel mode is the most secure, but will lead to larger system overhead.< br>
The Link-Layer VPN wall technology
PTP Protocol:
PPTP point to Point Tunneling Protocol is by the PPTP forum for the development of point-to-point secure tunnel Protocol for use of telephone Internet access of the user to provide the secure VPN service, established in 1996 as a IETF draft. PPTP is the PPP Protocol an extension, provided in the IP network to establish a multi-Protocol security VPN communication, the remote user can be through any of support for PPTP ISP to access the corporate private network.< br> - PPTP offers PPTP client and the PPTP server between the secure communication. The PPTP client is running the Protocol of the PC, the PPTP server is running on the Protocol Server. Through the PPTP, customers can use dial-up access to the public IP network. Dial-up customers first in a conventional manner to dial up to the ISP's Access server, establish a PPP connection; on this basis, the customers for secondary dial-up to establish the PPTP connection to the server, the connection is called a PPTP tunnel. The PPTP tunnel is essentially based on the IP Protocol of another PPP connection, wherein the IP packet can encapsulate a variety of Protocol data, including TCP / IP, IPX and NetBEUI for. For a direct connection to the IP network of the client is not required for the first PPP dial-up connection, be connected directly to the PPTP server for establishing a virtual path.< br>PPTP is the biggest advantage of Microsoft's support, an additional advantage is that it supports flow control, it can guarantee between client and server is not congested, the improvement of communication performance, minimizes packet loss and re-discovery. PPTP to establish a tunnel of the initiative to the customer, but the customer need in which on the PC configuration PPTP, doing both will increase the user workload, will cause the network to security risks. In addition, PPTP works only in IP, not with the end of the tunnel authentication function, you need to rely on the user authentication.< br>
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