The existing network infrastructure of the corporation may be prepared to use VPN like https://addons.mozilla.org/en-US/firefox/addon/veepn-free-fast-security-vpn/ with the help of the software , so and with the help of hardware maintenance .... Organization of virtual private network can be compared with the laying of the cable through a global network . As a rule , connection between the remote user and the terminal device of the tunnel is established by protocol PPP.
The most common method for creating a tunnel the VPN - encapsulation of network protocols (the IP, the IPX, the AppleTalk and t .d . ) In PPP and Later Click th encapsulation formed packets in the protocol tunneling . Typically, in a last acts IP or (much less likely ) the ATM and the Frame Relay. Such an approach is called tunneling of the second level , as "a passenger" here is the protocol exactly Mo orogo level .
An alternative approach - Encapsulation packet network protocol directly to proto count tunneling ( e.g. , VTP) is called tunneling of the third level .
Regardless of the fact , what protocols are used or what purpose are pursued when organizing a tunnel , the basic technique remains practically unchanged . Typically, one protocol is used for establishing connections with the remote node , and the other - to encapsulate the data and overhead information with the purpose of transmission via the tunnel .
Classification of VPN networks
VPN solutions can be classified according to several main parameters :
By the type of environment used :
Secure VPN networks . The most common variant of private private set th . With its help, it is possible to create a reliable and secure subnet based on an unreliable network , usually the Internet . Examples of secure VPNs are : IPSec, OpenVPN, and PPTP.
Trusted VPN networks . Used in cases where the transmission medium may be counting be reliable and it is necessary to solve a problem of creating a virtual subnet in the framework of a greater network . Questions ensure safety becomes irrelevant . Examples of such VPN solutions are : MPLS and L2TP . Correct to say that these protocols pereklady vayut task of ensuring security on the other , such as the L2TP, as a rule , used in a pair with IPSec.
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