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What is a VPN

VPN is an acronym for Virtual Private Network. A VPN provides an encrypted and secure connection "tunnel" path from a user's machine to its destination through the public Internet.

A Virtual Private Network comprised of existing dedicated networks, the Internet, or a combination of both

VPN

VPN

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How does VPN work ?

The VPN, remote computer must have the VPN client software installed.

When connection to the corporate network is attempted, the VPN client software will first connect to the VPN server using a tunneling protocol.

After the remote computer has been successfully authenticated, a secure connection (secret tunnel) between it and the VPN server will then be formed.

The network tunnel between them, even though established through the un-trusted Internet, is still considered secure enough that the remote computer can be trusted by local computers on the corporate LAN.

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How does VPN works ?(Cont.)

In fact, the remote computer will even be allocated with an IP address from the Corporate IP address space by the VPN server once successfully authenticated.

It is this automatic IP address translation between ISP's IP address and the Corporate IP address offered by the VPN server which makes the remote PC look like a local computer.

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VPN Characteristics

Cheaper than WANs-dedicated leased lines are very expensive.

Easier to establish than WANsSlower than LANs

-encryption/decryption takes time typical LANS are 10-100 Mbps.

dial in users are going to be typically 56Kbps.

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VPN Characteristics (Cont.)

Less reliable than WANs– with WANs routers are under your control and

performance is negotiated with provider, not so with VPN you only control initial IP connection.

Less secure than isolated LANs– because Internet is used hackers can find you– VPN protocol is one more thing to be attacked

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VPN can work with any kind of platform and a wide variety of protocols as long as they use IP.

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Types of VPNs

Server based

Firewall based

Router based (including VPN appliances)

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Server based

Windows– Routing and Remote Access Service (RRAS)

• NT supports only PPTP,• Win2000 supports PPTP, L2TP and IPSec

– comes with everything needed to establish a VPN.

Linux UNIX

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Secure VPN: The Corporate Way

CorporationsSmall BusinessesUniversitiesHome Users

Nominate VPN ‘s as the Secure Choice !

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Secure Site-to-Site Connectivity

Using a VPN to connect branch offices to

headquarters is less expensive and provides faster access to files and applications compared to leased lines that interconnect the LANs (Local Area Networks) and WANs (Wide Area Networks).

Organizations purchase Internet connections that cost less and are faster than leased lines.

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Secure Business to Business Connectivity

VPN’s increase secure communication and productivity with partners, customers, and suppliers by allowing them

access to internal data and applications remotely.

Customers can place orders, suppliers can see inventories, and partners can access the critical and confidential information they need in real time.

Again, by using the public Internet, organizations can build extranets without an expensive private network.

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Why VPN’s

Corporations large and small are embracing

Virtual Private Networks (VPNs) as a means to

build networks that provide secure access for

remote and mobile employees.

How to configure VPN on

Windows Server2003

BZUPAGES.COMEnable VPN and/or dial-up services on the local server.

BZUPAGES.COMThis server will allow only VPN connections.

BZUPAGES.COMHere 192.168.1.120 interface is used for remote connections.

BZUPAGES.COMCreate an address space for remote clients.

BZUPAGES.COMMore options are available now that RRAS is enabled.

BZUPAGES.COMAdd new users using active Directory

BZUPAGES.COMRight Click to Create new user

BZUPAGES.COMEnable VPN and/or dial-up services on the local server.

BZUPAGES.COMPassword for new user

BZUPAGES.COMNew users added

BZUPAGES.COMEnabling someone to use the VPN server

How to get connected to a Windows Server

2003 VPN

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starts New connection wizard

BZUPAGES.COMChoose your network connection type

BZUPAGES.COMChoose Virtual Private Network connection option

BZUPAGES.COMNew VPN connection has been created

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