My Netwok Dictionary

A virtual private network (VPN) is a setting that combines the use of two types of technologies:

• Security technologies that allow the definition of a private network, ie a confidential means of communication can not be intercepted by outside users to the network.
• The protocol encapsulation technologies that enable, rather than a physical connection is for the private network can use a public network infrastructure such as the Internet, to define it over a virtual network.

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Each of the types of VPN often corresponds to a specific configuration.

• In the VPN intranets, the most common situation is that every intranet is a VPN gateway that connects the LAN to the Internet. The Gateway communicates with the other intranets, using encryption and necessary protections to the communications gateway through the Internet gateway. When the packets arrive at the destination intranet, the corresponding gateway decrypts and forwards through the local network to the computer that needs to receive.

  In this way it uses the public Internet infrastructure, rather than setting up dedicated private lines, which would mean a higher cost. It also leverages the reliability and redundancy provided by the Internet, because if a route is not always available packets can be routed the other way while a dedicated line with the redundancy would cost even higher.

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The Cisco products support the latest technology of Virtual Private Networks (VPN). The VPN is a service that offers dependable and protected connectivity in a shared public network communications such the same as the Internet. The VPN conserve the same politics of security and administration as a private network. They are the most economical way to establish a connection point-to-point between remote users and the network of a client of the firm.

Here are the three main types of VPN:

• VPN Access: The VPN of access offer remote access to a mobile worker and a small office /home office (SOHO), to the headquarters of the internal or external network through a shared infrastructure. The VPN of access use analog technologies, dialup, ISDN, digital subscriber line (DSL), cable and mobile IP to provide secure connections to mobile users, employees at remote and branch offices.

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Soft and flexible multi-access routing:

As we all know, two-lane route can be used to achieve hardware routers and software routers (Linux and Windows, under the policy routing ROS), and a dedicated hardware router hardware itself, so in a cost considerations, the CPU is more than 8-bit or 16-bit machine, and its also a few megabytes to tens of megabytes cache. The software router, especially Windows 2003 software route, just do a good (anti-virus, hardware stability, anti-attack) and their stability and performance are absolutely did not say, and particularly its handling of large Internet cafes The ability to route the request, much higher than Linux.

Two-lane route VPN server: set environment in the two-lane, two-lane single local area network gateway to provide Internet access, although providing Internet access toward the remote VPN dial-up connection and the establishment of IPsec tunnel server. Remote VPN dial-up policy routing: Remote VPN dial-up machine, using the local gateway access, while using policy routing by line, and service in the local network to share Internet access. Read the rest of this entry »

The concept of virtual private network:

The company’s local area network (LAN or RLA) are networks internal to an organization, namely the links between networks belonging to the organization. These networks are increasingly connected to the Internet through the interconnection equipment. It often happens that companies have the need to communicate via Internet with subsidiaries, customers or employees geographically dispersed.

On the other hand, the data transmitted over the Internet are much more vulnerable than when running on a network within the organization, as the route taken is not defined a priori, which means that the data circulating on the public network infrastructure belonging to different operators. So it is not impossible that during the race, the network is played by a user indiscreet or subtracted. It is therefore conceivable to transmit sensitive information to the organization or company in these conditions. Read the rest of this entry »

Frame relay configuration on router FWSW:

FRSW(config) # frame-relay switching

FRSW(config)#int s1/0

FRSW (config-if) # encapsulation frame-relay IETF
FRSW (config-if) # clock rate 2016000
FRSW(config-if)#frame-relay lmi-type cisco Read the rest of this entry »