OpenVPN —— TUN Device and TAP Device

角色

在OpenVPN有两种连接方法。TUN Device and TAP Device

从【1】，
TUN Device： A TUN device is a virtual point-to-point IP link.
TAP Device： A TAP device is a virtual ethernet adapter.

从【2】，
TUN (as in network TUNnel) simulates a network layer device and it operates with layer 3 packets such as IP packets. TUN is used with routing.
TAP (as in network tap) simulates a link layer device and it operates with layer 2 packets such as Ethernet frames. TAP is used to create a network bridge.


【1】http://openvpn.net/index.php/ope ... d-a-tap-device.html
【2】http://en.wikipedia.org/wiki/TUN/TAP