University of Tsukuba Virtual Private Network, UT-VPN is a free and open source software

Free and open source software

Free and open-source software or free/libre/open-source software is software that is liberally licensed to grant users the right to use, study, change, and improve its design through the availability of its source code...

 application that implements virtual private network

Virtual private network

A virtual private network is a network that uses primarily public telecommunication infrastructure, such as the Internet, to provide remote offices or traveling users access to a central organizational network....

 (VPN) techniques for creating secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It uses SSL/TLS

Transport Layer Security

Transport Layer Security and its predecessor, Secure Sockets Layer , are cryptographic protocols that provide communication security over the Internet...

 security for encryption and is capable of traversing network address translators (NATs) and firewall

Firewall (computing)

A firewall is a device or set of devices designed to permit or deny network transmissions based upon a set of rules and is frequently used to protect networks from unauthorized access while permitting legitimate communications to pass....

s. It was written by Daiyuu Nobori and SoftEther Corporation, and is published under the GNU General Public License (GPL) by University of Tsukuba

University of Tsukuba

is located in the city of Tsukuba, Ibaraki Prefecture in the Kantō region of Japan. The University has 28 college clusters and schools with a total of around 15,000 students...

.

UT-VPN has compatible as PacketiX VPN product of SoftEther Corporation. UT-VPN developed based on PacketiX VPN, but some functions was deleted. For example, the RADIUS client is supported by PacketiX VPN Server, but it is not supported by UT-VPN Server.

Networking

UT-VPN is software to consist of UT-VPN Server and UT-VPN Client. UT-VPN functions as L2-VPN (over SSL/TLS).

UT-VPN Client

'Virtual NIC' (virtual network interface card) is installed in OS how UT-VPN Client was installed in. Virtual NIC is recognized as physical NIC by OS. UT-VPN does encapsulation to TCP (or SSL/TLS) packets from L2 frames by Virtual NIC.

UT-VPN Client connects with UT-VPN Server. If authorization with UT-VPN Server succeeded, UT-VPN Client establishes connection with Virtual HUB.

UT-VPN Server

UT-VPN Server have some 'Virtual HUB', and they function as virtual L2 switch. Virtual HUB does handle frames which received from UT-VPN Client. If necessary, UT-VPN Server forwards encapuslated L2 frames to UT-VPN Client.
Virtual HUB on UT-VPN Server has function cascading connection for Virtual HUB on other UT-VPN Server. Site-to-site connection can come true with cascading connection.

L2 Bridge

UT-VPN Server has bridging function between arbitrary NIC which OS has and virtual HUB.

L3 Switch

UT-VPN Server has Virtual L3 switch function. Virtual L3 switch does L3-switching between virtual HUB on the UT-VPN Server.

UT-VPN Server

• Windows
  Microsoft Windows
  Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...
  
  
• Windows 98 / Millennium Edition
• Windows NT 4.0
• Windows 2000
• Windows XP
• Windows Server 2003
• Windows Vista
• Windows Server 2008
• Hyper-V Server
• Windows 7
• Windows Server 2008 R2

* Supported for x86/x64

• UNIX
  Unix
  Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna...
  
  
• Linux (2.4 or later)
• FreeBSD (6.0 or later)
• Solaris (8.0 or later)
• Mac OS X (Tiger or later)

* If it is the environment where compiling it is possible of the source code, UT-VPN Server works.

UT-VPN Client

• Windows
• Windows 98
• Windows ME
• Windows 2000
• Windows XP
• Windows Server 2003
• Windows Vista
• Windows Server 2008
• Hyper-V Server
• Windows 7
• Windows Server 2008 R2

*Supported for x86/x64

• UNIX
• Linux (2.4 or later)

* The Virtual NIC does not work in other UNIX operating systems.

See also

• University of Tsukuba
  University of Tsukuba
  is located in the city of Tsukuba, Ibaraki Prefecture in the Kantō region of Japan. The University has 28 college clusters and schools with a total of around 15,000 students...
  
  
• SoftEther Corporation
• OpenVPN
  OpenVPN
  OpenVPN is a free and open source software application that implements virtual private network techniques for creating secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It uses a custom security protocol that utilizes SSL/TLS for...
  
  , The well-known open source VPN software.

External links

• Official links
  • UT-VPN OpenSource Project (Japanese)
  • UT-VPN Download (Japanese, require email address)