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virtual private network
(redirected from Virtual private networking)

   Also found in: Acronyms, Wikipedia, Hutchinson 0.07 sec.

virtual private network

See VPN. Remember... try the acronym first!


virtual private network [¦vər·chə·wəl ‚prī·vət ′net‚wərk]
(communications)
A wide-area network whose links are provided by a common carrier although they appear to the users to behave like dedicated lines, and whose computers use a common cryptographic key to send messages from one computer in the network to another. Abbreviated VPN.

(networking, security)Virtual Private Network - (VPN) The use of encryption in the lower protocol layers to provide a secure connection through an otherwise insecure network, typically the Internet. VPNs are generally cheaper than real private networks using private lines but rely on having the same encryption system at both ends. The encryption may be performed by firewall software or possibly by routers.

Link-level (layer 2 and 3) encryption provides extra protection by encrypting all of each datagram except the link-level information. This prevents a listener from obtaining information about network structure. While link-level encryption prevents traffic analysis (a form of attack), it must encrypt/decrypt on every hop and every path.

Protocol-level encryption (layer 3 and 4) encryption encrypts protocol data but leaves protocol and link headers clear. While protocol-level encryption requires you to encrypt/decrypt data only once, and it encrypts/decrypts only those sessions that need it, headers are sent as clear text, allowing traffic analysis.

Application (layer 5 up) encryption is based on a particular application and requires that the application be modified to incorporate encryption.

Cisco.


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At Netword+Interop in May, Cybernet Systems Corporation introduced what the company hopes will be the first product to bring Linux virtual private networking to the mainstream business market.
NASDAQ:JNPR) today announced that CPCNet Hong Kong Limited, a wholly owned subsidiary of CITIC Pacific (SEHK:267), has deployed Juniper Networks M-series multiservice edge routing platforms to expand its MPLS-based IP virtual private networking (VPN) service in Ningbo, Chengdu and Zhongshan.
Inkra's Virtual Service Switch technology integrates and virtualizes critical networking and security services -- such as firewall, load balancing, intrusion detection and prevention (IDP), virtual private networking (VPN), and more onto a single, centrally managed platform.
 
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