What is a virtual network card under linux

The virtual network card under Linux is a virtual network device that allows multiple logical network interfaces to be mapped to a single physical network interface. Common virtual network card types are: 1. Virtual Ethernet device, using virtual Ethernet Network technology simulates a physical Ethernet adapter and provides communication between a virtual machine or container and the physical network; 2. Tap device, which provides a virtual network interface between user space programs and the kernel; 3. Bridge device, which connects two or more A network interface allows it to work in the same network segment; 4. A virtual loopback device performs communication loopback on the local host.

The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.

In Linux, a virtual network card (Virtual Network Interface) is a virtual network device that allows multiple logical network interfaces to be mapped to a single physical network interface. Virtual NIC is a part of network virtualization and is used to create, manage and connect virtual networks.

The following are some common types of virtual network cards and their functions:

1. Virtual Ethernet Device: One of the most common types of virtual network cards one. They use virtual Ethernet technology to emulate a physical Ethernet adapter and provide communication between a virtual machine or container and the physical network. For example, eth0, eth1, etc. are the names of virtual Ethernet devices.

2. Tap device (TUN/TAP Interface): used to provide a virtual network interface between user space programs and the kernel. TAP devices can be used to implement virtual private network functions and realize communication between virtual machines or containers.

3. Bridge Device: Used to connect two or more network interfaces so that they work within the same network segment. A bridge device acts as a switch and forwards packets connected to different physical interfaces.

4. Virtual loopback device (Loopback Device): It is a virtual network card used for communication loopback on the local host. IP addresses 127.0.0.1 and localhost are both bound to the virtual loopback device.

Virtual network cards are used in a wide range of scenarios. They can be used in virtualization platforms, container technology, network testing, network monitoring and other fields. By creating and configuring virtual network cards, you can achieve a more flexible, secure and efficient network architecture and application deployment method.

The above is the detailed content of What is a virtual network card under linux. For more information, please follow other related articles on the PHP Chinese website!