SOFTETHER VPN PROJECT VPN Projectdevelops and VPN, An Open-Source Free ​Cross-platform Multi-protocol VPN Program, as an academic project fromUniversity of Tsukuba, under the Apache License 2.0.

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What is VPN

* VPN ("" means "Software Ethernet") is one of the world"s most powerful and easy-to-use multi-protocol VPN software. It runs on Windows, Linux, Mac, FreeBSD and Solaris. VPN is open source. You can use for any personal or commercial use for free charge. VPN is an optimum alternative to OpenVPN and Microsoft"s VPN servers. VPN has a clone-function of OpenVPN Server. You can integrate from OpenVPN to VPN smoothly. VPN is faster than OpenVPN. VPN also supports Microsoft SSTP VPN for Windows Vista / 7 / 8.No more need to pay expensivecharges forWindows Server license for Remote-Access VPN function. VPN can be used to realize BYOD (Bring your own device) on yourbusiness.If you have smartphones, tablets or laptop PCs, VPN"s L2TP/IPsec server functionwill help you to establish a remote-access VPN from your local network. VPN"s L2TP VPN Server has strong compatible with Windows, Mac, iOS and Android.

* VPN is not only an alternative VPN server to existing VPN products (OpenVPN, IPsec and MS-SSTP). VPN has also original strong SSL-VPN protocol to penetrate any kinds of firewalls. Ultra-optimized SSL-VPN Protocol of VPN has very fast throughput, low latency and firewall resistance. VPN has strong resistance against firewalls than ever. Built-in NAT-traversal penetrates your network admin"s troublesome firewall for overprotection. You can setup your own VPN server behind the firewall or NAT in your company, and you can reach to that VPN server in the corporate private network from your home or mobile place, without any modification of firewall settings. Any deep-packet inspection firewalls cannot detect VPN"s transport packets as a VPN tunnel, because VPN uses Ethernet over HTTPS for camouflage.

Easy to imagine, design and implement your VPN topology with VPN. It virtualizes Ethernet by software-enumeration. VPN Client implements Virtual Network Adapter, and VPN Server implements Virtual Ethernet Switch. You can easily build both Remote-Access VPN and Site-to-Site VPN, as expansion of Ethernet-based L2 VPN. Of course, traditional IP-routing L3 based VPN can be built by VPN.

* VPN has strong compatibility to today"s most popular VPN productsamong the world. It hasthe interoperability with OpenVPN, L2TP, IPsec, EtherIP, L2TPv3, Cisco VPN Routers and MS-SSTP VPN Clients. VPN is the world"s only VPN software which supports SSL-VPN, OpenVPN, L2TP, EtherIP, L2TPv3 and IPsec, as a single VPN software. VPN is free software because it was developed as Daiyuu Nobori"s Master Thesis research in the University. You can download and use itfrom today. The source-code of VPN is available under the Apache License 2.0.

Features of VPN

Resistance to highly-restricted firewall. Windows, Linux, Mac, Android, iPhone, iPad and Windows Mobileare supported. No memory leaks. High quality stable codes, intended for long-term runs.We always verify that there are no memory or resource leaks before releasing the build. RADIUS / NT Domain user authentication function RSA certificate authentication function Deep-inspect packet logging function Source IP address control list function syslog transfer function

Architecture of VPN


Virtualization of Ethernet devices is the key of the VPN architecture. VPN virtualizes Ethernet devices in order to realize a flexible virtual private network for both remote-access VPN and site-to-site VPN. VPN implements the Virtual Network Adapter program as a software-emulated traditional Ethernet network adapter. VPN implements the Virtual Ethernet Switch program (called Virtual Hub) as a software-emulated traditional Ethernet switch. VPN implements VPN Session as a software-emulated Ethernet cable between the network adapter and the switch.

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You can create one or many Virtual Hub with VPN on your server computer. This server computer will become a VPN server, which accepts VPN connection requests from VPN client computers.

You can create one or many Virtual Network Adapter with VPN on your client computer. This client computer will become a VPN client, which establishes a VPN connections to the Virtual Hub on the VPN server.

You can establish VPN sessions, as called "VPN tunnels", between VPN clients and VPN servers. A VPN session is the virtualized network cable. A VPN session is realized over a TCP/IP connection. The signals through the VPN session is encrypted by SSL. Therefore, you can safely establish a VPN session beyond the Internet. A VPN session is established by VPN"s "VPN over HTTPS" technology. It means that VPN can create a VPN connection beyond any kinds of firewalls and NATs.


Ad-hoc VPN

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Geologically distributed branches are isolated as networks by default. VPN lays virtual Ethernet cables between your all branches. Then all computers of all branches are connected to the single LAN.

Remote Access to LAN


Does employees need to connect to the company LAN from outside or home? Remote Access VPN will realizes virtual network cable from a Client PC to the LAN from anywhere and anytime.

api/deki/files/606/=banner2.jpg" /> VPN can build-up flexible and dependable virtual network around Clouds. Amazon EC2, Windows Azure and most of other Clouds are supporting VPN.

Join a Cloud VM into LAN

Your Cloud VM can join to your company LAN with VPN. Anyone on your company can access to the Cloud VM without any settings.

Cloud to LAN Bridge VPN

api/deki/files/580/=banner2_4.jpg" />Are you using Amazon EC2 and Windows Azure, or using two or more remote datacenters of a Cloud service? VPN can make a single united network between all Cloud VMs despite differences of physical locations.

* VPN supports several mobile devices including iPhone and Android. Your smartphone is now a part of your on-premise or Cloud network by using VPN.

iPhone and Android has a built-in VPN client but originally they need Cisco, Juniper or other expensive hardware-based VPNs for remote-access. VPN has a same function to Cisco, and supports your iPhone and Android easily.

Windows and Mac Laptops

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