VPN protocols

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VPN protocols

Following are the protocols used to encrypt a virtual private network (see VPN).

Very popular, OpenVPN is a unique VPN protocol that runs on every platform. It uses the OpenSSL library, which offers strong 256-bit encryption. Because it runs on SSL port 443, it defeats VPN blocking. OpenVPN also supports dynamic IP addresses at both ends of the connection. It can also be added to the router.

Layer 2 Tunneling Protocol - IP Security

L2TP provides the tunneling, while IPsec does the authentication and encryption. Offers respectable security and performance if the AES encryption is selected rather than 3DES. L2TP is easily blocked because it uses only a few ports (see IP port).

SSTP - Secure Socket Tunneling Protocol
A Microsoft protocol mainly for Windows, SSTP is not easily blocked because it uses a standard SSL 443 port, but it does use the older SSL security protocol.

PPTP - Point-to-Point Tunneling Protocol
An early and rather vulnerable protocol. Good for unblocking location-blocked websites.

Internet Key Exchange Version 2/IP Security
The latest VPN protocol but not available on popular operating systems.
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References in periodicals archive ?
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It also supports a variety of networking and VPN protocols, including NAT, PPPoE (client), DHCP (client, server), DNS (client), as well as L2TP, PPTP and IPSec passthrough.
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VPNC members include the industry's leading VPN vendors as well as other hardware and software manufacturers providing product evaluation and certification for the major VPN protocols: IPSec, L2TP over IPSee, and PPTP.
Integrity checking is a feature that is built into specific VPN protocols, notably IPSec (a protocol endorsed as an industrywide standard by the Internet Engineering Task Force).
The unit supports embedded IPSec VPN protocols, allowing users to establish up to 16 simultaneous encrypted private tunnels over the Internet.
This interface should be consistent across all types of users, whether they are connected through LANs, dialing from other countries, using conventional PPP-based dial-up, or using Internet VPN protocols.
It is considered highly flexible, interoperating on top of IPv4, IPSec, PPTP, L2TP, or other lower level VPN protocols.