Microsoft
The Microsoft Windows operating system has integrated VPN technology that helps provide secure, low-cost remote access and branch office connectivity over the Internet. Windows Server 2003 virtual private networking has been designed to interoperate with VPN software and devices that support industry standards for secure remote access. Microsoft supports VPN interoperability through standards such as Layer Two Tunneling Protocol with Internet Protocol security (L2TP/IPSec) and the Point-to-Point Tunneling Protocol (PPTP). In Microsoft VPN:
PPTP provides simple-to-use, lower-cost VPN security. Unlike VPNs that use IPSec technology, PPTP is compatible with most Network Address Translators (NATs) and supports both multi-protocol and multicast environments. It also combines standard user password authentication with strong encryption without requiring the complexity and expense of public key infrastructure (PKI).
IPSec provides advanced security for VPN but was not designed to address critical remote access requirements such as user authentication and address assignment. In addition, it does not support multi-protocol or multicast (including some routing protocols). It is applicable only to IP unicast traffic.
L2TP in combination with IPSec (L2TP/IPSec) is the only standards-track technology (RFC 3193) that addresses these remote access VPN requirements while leveraging IPSec for encryption. L2TP currently retains the same IETF standards-track status as IPSec (The Microsoft Windows Team, 2003).
Cisco
Simple to deploy and operate, the Cisco VPN Client enables users to establish secure, end-to-end encrypted tunnels. This thin design, IPsec implementation can be used with any Cisco central site remote access VPN product. A media CD is included with the Cisco VPN 3000 Series Concentrator. Cisco VPN is more reliable than Microsoft Windows (Adam, 2003).
The client can be pre-configured for mass deployments and initial logins require very little user intervention. VPN access policies and configurations are downloaded from the central gateway and pushed to the client when a connection is established, allowing simple deployment and management, as well as high scalability....................
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