Netmetric Solutions

( Meer Shahanawaz ) ( Abdullah )

VPN Definition

Virtual Private Network. A network which uses the public network to transfer information using secure methods. For example, you could set up a VPN between your home office and your business office using security and encryption and the Internet as your transfer pipe.

VPN is used to make the communication between two private networks over the Internet.

A VPN carris private traffic over a public network using advanced encryption and tunnels to protect:

.Confentiality of Information.integrity of data

.Authentication of users

A VPN is used to make the tunnel between two private netwoks over the internet.

. A tunnel is a virtual point-point connection.. The tunnel carries one protocol inside another protocol

. Encryption transforms content information into ciphertext . Decryption restores content information from ciphertext

Types of VPN 1.Site to Site VPN 2.Remote Access VPN

VPN with different Host1.PC ( Host ) to PC (Host ) 2.PC (Host) to Router 3.Router to Router 4.Router to

Firewall 5.Firewall to Firewall

1.VPN used the protocols to make the tunnel , such as PPTP Point to Point Protocol

L2TP Layer 2 Tunneling ProtocolIPSEC Internet Protocol Security

2.VPN used to make the Gateway to Gateway to communication

3.VPN is used to encrypt the using some public or private key , so that only authorized users is able to decrypt the communication.

PPTP Definition

Point-to-Point Tunneling Protocol, a new technology for creating Virtual Private Networks (VPNs) , developed jointly by Microsoft Corporation, U.S. Robotics, and several remote access vendor companies, known collectively as the PPTP Forum. A VPN is a private network of computers that uses the public Internet to connect some nodes. Because the Internet is essentially an open network, the Point-to-Point Tunneling Protocol (PPTP) is used to ensure that messages transmitted from one VPN node to another are secure. With PPTP, users can dial in to their corporate network via the Internet.

L2TP Definition

Short for Layer Two (2) Tunneling Protocol, an extension to the PPP protocol that enables ISPs to operate Virtual Private Networks (VPNs). L2TP merges the best features of two other tunneling protocols: PPTP from Microsoft and L2F from Cisco Systems. Like PPTP, L2TP requires that the ISP's routers support the protocol.

IP SECURITY

Short for IP Security, a set of protocols developed by the IETF to support secure exchange of packets at the IP layer. IPsec has been deployed widely to implement Virtual Private Networks (VPNs).

IPsec supports two encryption modes: Transport and Tunnel. Transport mode encrypts only the data portion (payload) of each packet, but leaves the header untouched. The more secure Tunnel mode encrypts both the header and the payload. On the receiving side, an IPSec-compliant device decrypts each packet.

For IPsec to work, the sending and receiving devices must share a public key. This is accomplished through a protocol known as Internet Security Association and Key Management Protocol/Oakley (ISAKMP/Oakley), which allows the receiver to obtain a public key and authenticate the sender using digital certificates