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A software-based virtual serial port presents one or more virtual serial port identifiers on a PC which other applications can see and interact with as if they were real hardware ports, but the data sent and received to these virtual devices is handled by software that manipulates the transmitted and received data to grant greater functionality.
When the USB to serial adapter is connected to the computer via the USB-port the driver on the computer creates a virtual COM port which shows up in Device Manager on Windows, and under /dev on Linux and MacOS. This virtual COM port can be accessed and used as if it was a built-in serial COM-port.
Virtual devices may also operate in a non-virtualized environment. For example, a virtual network adapter is used with a virtual private network, while a virtual disk device is used with iSCSI. A good example for virtual device drivers can be Daemon Tools. There are several variants of virtual device drivers, such as VxDs, VLMs, and VDDs.
The Remote Network Driver Interface Specification (RNDIS) is a Microsoft proprietary protocol used mostly on top of USB. [1] It provides a virtual Ethernet link to most versions of the Windows, Linux, and FreeBSD operating systems. Multiple revisions of a partial RNDIS specification are available from Microsoft, but Windows implementations have ...
Furthermore, it is possible to simulate several virtual NICs by implementing virtual miniport drivers that send and receive traffic from a single physical NIC. One example of virtual miniport driver usage is to add virtual NICs, each with a different VLAN. Because implementations cannot assume that other drivers received the same buffers, one ...
In computer networking, TUN and TAP are kernel virtual network devices. Being network devices supported entirely in software, they differ from ordinary network devices which are backed by physical network adapters. The Universal TUN/TAP Driver originated in 2000 as a merger of the corresponding drivers in Solaris, Linux and BSD. [1]
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WinDbg allows debugging a Microsoft Windows kernel running on a virtual machine by VMware, VPC or Parallels using a named pipe. This can be achieved by using a virtual COM port. In the case of VMware and VirtualBox, the VirtualKD extension adds native support for VM debugging to the Windows kernel, claiming to speed debugging by a factor of up ...