V.TOP USB 3.0 to Gigabit Ethernet NIC 10/100/1000 Mbps Network Adapter with Dual RJ45 LAN Ports Supports Windows and MacOS Integrated USB 3.0 pass-through port, Dual Gigabit Ethernet ports through a single USB connection. IEEE 802.3, 802.3u and 802.3ab (10BASE-T, 100BASE-TX, and 1000BASE-T) compatible, IEEE 802.1Q VLAN Tagging support. Business or IT professionals that need to connect to two separate networks simultaneously. Run a virtual machine(s) on a workstation, with access to separate physical network connections. OS Supported -Windows XP, 7, 8, 10 | Mac OS 10.6 to 10.12 - VLAN tagging is currently not supported in Mac OS | Linux Kernel 2.6.25 to 4.11.x LTS Versions only.