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Mobile virtual private network
A mobile virtual private network (mobile VPN or mVPN) provides mobile devices with access to network resources and software applications on their home network, when they connect via other wireless or wired networks.
Mobile VPNs are used in environments where workers need to keep application sessions open at all times, throughout the working day, as they connect via various wireless networks, encounter gaps in coverage, or suspend-and-resume their devices to preserve battery life. A conventional VPN cannot survive such events because the network tunnel is disrupted, causing applications to disconnect, time out,〔Phifer, Lisa. ("Mobile VPN: Closing the Gap" ), ''SearchMobileComputing.com'', July 16, 2006. Accessed July 25, 2009〕 fail, or even the computing device itself to crash.〔Cheng, Roger. ("Lost Connections" ), ''The Wall Street Journal'', December 11, 2007. Accessed July 25, 2009〕 Mobile VPNs are commonly used in public safety, home care, hospital settings, field service management, utilities and other industries. Increasingly, they are being adopted by mobile professionals and white-collar workers.〔
==Comparison with other VPN types==
A VPN maintains an authenticated, encrypted tunnel for securely passing data traffic over public networks (typically, the Internet.) Other VPN types are IPsec VPNs, which are useful for point-to-point connections when the network endpoints are known and remain fixed; or SSL VPNs, which provide for access through a Web browser and are commonly used by remote workers (telecommuting workers or business travelers).
Makers of mobile VPNs draw a distinction between remote access and mobile environments.〔 A remote-access user typically establishes a connection from a fixed endpoint, launches applications that connect to corporate resources as needed, and then logs off. In a mobile environment, the endpoint changes constantly (for instance, as users roam between different cellular networks or Wi-Fi access points). A mobile VPN maintains a virtual connection to the application at all times as the endpoint changes, handling the necessary network logins in a manner transparent to the user.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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