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PVNet is a project providing a virtual network interface. It generates numbers of pure virtual ethernet adapter. It is tested for Linux kernel 3.0.8 on amd64 cpu. Its code contains a kernel patch and module code. You can use it to create many ethernet cards. Each device has a single mac address.
Net Sharer,which is a GUI tool to help users to share their net easily,could work in a computer with single-NIC or multi-NIC.The software have an GUI to support port-mapping function too.