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Using the TUN/TAP driver to create a serial network connection

What is an interface table? Can one interface extend another interface? It might be possible although unlikely to cause a kernel panic through careless use. As you are running as root, taking arbitrary unchecked data from the public Internet, and creating a weak spot in the security infrastructure, now is an linux tuntap time to read up on taint mode. However, connections are not perfect and during transmission the packets can get damaged, altering their content or length.

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February Nobody Jan 26 '18 at Did you try to bridge? So, it is working. I believe I have a very similar linux tuntap to your original question. Then, an ioctl will be used to create the actual interface itself. Featured on Meta. After killing the program, the tap device does disappear from the network devices as seen by ifconfig as expected.

Running the program a second time, however, generates the following error note, linux tuntap program creates tap0 and tap1 devices :. Once I reboot, this problem goes away, and it works again 1 time. I've tried removing the tun kernel module and re-adding it rmmod tun Your code is a bit odd. Linux tuntap it's not certain that this is related to your problem, I would start by adding a.

Tun/Tap interface tutorial « \1

Then, you may want to copy the interface name into the provided string, so the caller can see which name was chosen by the kernel if it was asked to do so :. Finally, I was able to get the program working linux tuntap if: ifconfig tap0 down ifconfig tap1 down rmmod -f tun modprobe tun. I discovered that I can create the tap devices using iproute2, and then connect to them later on in linux tuntap program. Then, I simply leave the tap devices created always and I they persist after my program exits.

Creating tap/tun devices with IP tuntap and tunctl as detailed in Linux network tools

Would this be a better way of doing this? Yes, if you have a version of iproute2 recent enough, you can create interfaces with it. If you plan to use existing tools to connect to the tap interface, then it's probably quicker and easier to also use existing tools to create it eg iproute2, tunctl, openvpn can all do itso you don't have to bother with writing code yourself. If instead you need to do something special or specific to your task that cannot be accomplished with existing tools, then of course writing your own code C or otherwise is the way to go. Another reason for writing your own code is to learn and understand better how things work.

Strictly speaking, to write you use write ; ioctl is used to set certain linux tuntap parameters on the interface. It seems I spoke too soon.

For example:. So I think it can still be said that ioctl are needed. I am a newbie, when I run the code copy from simpletun. To run that code, you have to either be root, or the interface linux tuntap exist already and owned by the user linux tuntap running as. I have a tun which I use to forward packets to some other nodes there is not a tunnel among them.

The packets that send through the tun interface are received from the service but I cannot received the responses in the tun. Linux tuntap you have any solution? You provide very little information, so it's difficult to tell.


Check that the linux tuntap running the service has a route back to the tun node. Also, what does it mean "there is not a tunnel"? I have a question about using tap interfaces.

TUN/TAP Demystified –

I'm trying to set linux tuntap a tap interface on a host, where one end will be the network interface for a virtual machine. On the other linux tuntap of the interface, I want to read all the outgoing VM traffic and send it to another host or hosts which also have VM's and taps running.


I've had limited success so far: I successfully capture the outgoing VM network traffic. However, it seems as though the host side of the tap interface is handling the traffic as linux tuntap, and will even respond to the VM via the tap interface.Description TUN/TAP provides packet reception and transmission for user space Multiqueue tuntap interface: From versionLinux supports multiqueue. Tun/tap linux tuntap are a feature offered by Linux (and probably by other UNIX-like operating systems) that can do userspace networking, that is.

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