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Questions tagged [tun]

TUN is a virtual network layer device which operates in OSI layer 3.

149 questions
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TAP/TUN adapter in LXC container

I am trying to create an lxc container that acts as a vpn server. I am trying to add the tap/tun adapter to the container's device list. I have tried adding the following line to the lxc config. lxc.cgroup.devices.allow = c 10:200 rwm That did not…
ashwinjv
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C compiler errors on TUN/TAP

I like to create a TUN/TAP interface out of a C++ program. I found a straight foward tutorial on the net at http://backreference.org/2010/03/26/tuntap-interface-tutorial/. The problem is, that I seem to have linking problems with with if.h and…
Marste
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ioctl fails when trying to get more than 8 queue file descriptor from a tun interface

After I heared that after kernel 3.8 linux added multi queue ability to tun tap device with flag IFF_MULTI_QUEUE, I upgraded my kernel to 3.10 and have its header in /usr/src then I altered my c code to have a thread to open a new queue file…
madz
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How can I get a IP of the local interface that directly connects to a default GW

-Environment- VPN connection(OpenVPN) -Default gateway is changed into VPN server IP -Virtual interface(tunXX) for VPN connection directly connects to a default gateway Interfaces & default gateway interfaces : lo inet addr:127.0.0.1 …
jazzsir
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tun program not creating device node

I'm following http://backreference.org/2010/03/26/tuntap-interface-tutorial/ The following code successfully gets a fd (usually 3) when I run it as root, but it does not create a /dev/tun77 device. Should it? #include #include…
fadedbee
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Is there a userspace TCP stack which operates as a TUN interface?

Is there a userspace TCP stack which operates as a TUN interface and with an API similar to POSIX on the application side?
fadedbee
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Create a socks proxy with SSH, but use a specific interface for outbound traffic

I have a linux server who have an interface "tun0" which is a VPN connection and I want to start a proxy on it for listing eth0 but use tun0 to get internet. (default route on the server stay on eth0) eth0 : ip 91.xxx.xx.xx ( public ip ) tun0 :…
Anthony
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Getting TCP Retransmission instead of ACK on TUN device

I'm trying to implement a TCP stack over TUN device according to RFC 793 in Linux. By default, my program is in the LISTEN state and is waiting for an SYN packet to establish a connection. I use nc to send an SYN: $ nc 192.168.20.99 20 My program…
Iman
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Masquerading docker interface and host interface

I am running a docker on a host and I would like to connect a specific interface inside the docker (TUN interface) to one the host's external interfaces. When running ifconfig inside the docker, I see 3 interfaces: eth0, lo and my_tun (tun…
TJR
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`ioctl` returns -1 when trying to TUNSETIFF a TUN device

I've been following the official documentation on creating a TUN device. There's very little documentation, but what even is there does not seem to work. Here's what I have so far: #include #include #include…
Carson Graham
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cannot assign IP to tun / tap interface because the error : System has not been booted with systemd as init system (PID 1). Can't operate

Hello I've created a tun tap interface inside WSL2,with the following commands : chown root.users /dev/net/tun chmod g+rw /dev/net/tun tunctl -t tap0 -u username ifconfig tap0 up at this point I tried to assign an IP address to it,but this is what…
john_connor
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Unable to receive UDP packets on multiple TUN device

I am trying to create multiple TUN devices to tunnel the multi-device traffic through a common physical interface. This is the schema I have: Socket 1 is sending traffic through tun1 with destiny IP 1.1.1.2 and Socket 2 is doing the same on the…
j0lama
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How do you identify iptables-marked packets in the user-space implementation of a tun device?

I have some custom VPN code, written in C, which uses a Linux tun device. Is it possible for this user-space code to see iptables marks that were attached to packets? Or do those marks not propagate as far as a tun interface?
fadedbee
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Are other layer 2 protocols than Ethernet possible over a TAP device?

When using a TAP-device, does someone know, if it is possible to use other layer 2 protocols than Ethernet, e.g. PPP oder FDDI? All examples, I could find only use Ethernet, but the kernel documentation…
OC Jan
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Exposing Tap interface from docker container to docker host

my application creates a tap interface inside a docker container. e.g. tap_1: ip: 192.168.2.1 My requirement is that any packet coming on docker host can be directly sent to tap interface which is present inside the docker container. I am basically…
AnkitG
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