![]() ![]() The NAT traversal function allows the VPN server behind existing NATs or firewalls to accept incoming VPN sessions. The UDP-mode of SoftEther VPN supports NAT traversal. SoftEther VPN can also establish a VPN session over UDP. For example, after you establish cascading connections between the site A, B and C, then any computers in the site A will be able to communicate with the computers in the site B and the site C. With cascading, you can integrate two or more remote Ethernet segments to a single Ethernet segment. You can define a cascading connection between two or more remote Virtual Hubs. You can realize a remote-access VPN from home or mobile to the company network by using the Local Bridge function. The Local Bridge exchanges packets between the physical Ethernet adapter and the Virtual Hub. You can define a local bridge between the Virtual Hub and the existing physical Ethernet segment by using the Local Bridge function. The Virtual Hub has a FDB (forwarding database) to optimize the transmission of Ethernet frames. The behavior is same to traditional Ethernet switches. The Virtual Hub exchanges all Ethernet packets from each connected VPN session to other connected sessions. It means that SoftEther VPN can create a VPN connection beyond any kinds of firewalls and NATs. ![]() A VPN session is established by SoftEther VPN's "VPN over HTTPS" technology. Therefore, you can safely establish a VPN session beyond the Internet. The signals through the VPN session is encrypted by SSL. A VPN session is realized over a TCP/IP connection. A VPN session is the virtualized network cable. You can establish VPN sessions, as called 'VPN tunnels', between VPN clients and VPN servers. This client computer will become a VPN client, which establishes a VPN connections to the Virtual Hub on the VPN server. You can create one or many Virtual Network Adapter with SoftEther VPN on your client 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 Hub with SoftEther VPN on your server computer. SoftEther VPN implements VPN Session as a software-emulated Ethernet cable between the network adapter and the switch. SoftEther VPN implements the Virtual Ethernet Switch program (called Virtual Hub) as a software-emulated traditional Ethernet switch. SoftEther VPN implements the Virtual Network Adapter program as a software-emulated traditional Ethernet network adapter. SoftEther VPN virtualizes Ethernet devices in order to realize a flexible virtual private network for both remote-access VPN and site-to-site VPN. ![]() Virtualization of Ethernet devices is the key of the SoftEther VPN architecture.
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