tun tap

When we use VMware virtualization software, we often find that they can all Virtualize a nic, which seems amazing. In fact, in Linux, there are two kinds of virtual backup, point-to-Point device in Tun. Tap indicates an Ethernet device. It is used as a virtual NIC Driver. Program Data receiving and sending does not directly deal with the real network card, but is transferred through the user State. In Linux

Most VPS providers default to TUN/TAP devices that are not configured for VPS and need to apply for open Tun/tap. How to verify that the OpenVZ VPS Tun/tap device has been correctly? Test with the following command: T

#include #include #include #include #include #include #include #include int Tun_create (char *dev, int flags){struct Ifreq IFR;int FD;int cmd;if (FD = open ("/dev/net/tun", O_RDWR)) {return FD;}memset (IFR, 0, sizeof (IFR));strcpy (Ifr.ifr_name, Dev);Ifr.ifr_flags |= flags;IOCTL (FD, Tunsetiff, (void *) IFR);return (FD);}int main (int argc, char *argv[]){Int Tun, ret;unsigned char buf[4096];unsigned char ip

http://blog.csdn.net/xuxinyl/article/details/6454119 We are using VMware virtualization software often found that they can be virtual out of a network card, seemingly very magical technology, in fact, under Linux is very simple, there are two virtual devices, Tun point-to-point equipment, tap means Ethernet devices, as a virtual network card driver, tun/

working with the use of Tap/tun devices to achieve virtual networks, see the online examples are implemented in C. The main thing to try to do with Python is to reuse the ctypes definition of the relevant structure. code GitHub Address: Https://github.com/happyAnger6/network_programming This git library will continue to use Python to implement network-related programming. if_tun.py: Is mainly related to

DescriptionTUN/TAP provides packet reception and transmission for user space programs.It can be seen as a simple point-to-point or Ethernet device, which,Instead of receiving packets from physical media, receives them fromUser space program and instead of sending packets via physical mediaWrites them to the user space program./*demo.c*/#include Terminal1:[[email protected] sf_share]$ make DemoCC Demo.c-o Demo[Email protected] sf_share]$./demoDevice Tu

I feel that these days someone is interested in my network name, today I will briefly introduce the origin of my network name.Program Ape has a classic internal joke: hand-held two 锟 jin, mouth cries hot hot hot.People who have written the code have come across it.Hot hot and Tuen Mun Tuen Mun generated from the VC, which is the debug mode VC initialization of the operation of the memory. The VC initializes the newly allocated memory in the stack to 0XCC, and initializes the newly allocated memo

layered model is good, but it is aimed at understanding the problem. In practice, it is necessary to destroy this model so that the NIC can process the data at the transport layer to improve efficiency, this is also an example of the victory of pragmatism, just as there is no pure CISC or RISC processor and it is a mixture of them, just as the twisted pair is better than the same axis.The following changes to the Tun Nic only use the

enter: Device Drivers----> Find and enter: Network Device Support---> You can see universal TUN/TAP device driver Support See Front is Note:[*], ⑥ compiling all the module drivers Input: Make modules This process takes a period of time (1-2 hours), and the same is true to ensure that the virtual machine space is large enough 4. Add modules to the kernel ① Copy Tun