Stack Overflow
Stack Overflow

Questions tagged [tun]

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

149 questions
0
votes
0 answers

how to attach to a TAP interface from two different processes

I have a tap interface created like this: ip tuntap add dev tap0 mode tap user myusername ip link set tap0 up I then attach to tap0 using python and another program written in C++ Python: def tapAlloc(tapname, mode): tap =…
brainydexter
  • 19,826
  • 28
  • 77
  • 115
0
votes
1 answer

Converting raw packet data received from a TUN interface

I'm trying to intercept packets going through a TUN interface. I want to convert the raw packet information to readable information so i can use it later. I'm using the following code: int main(){ char tun_name[IFNAMSIZ]; char data[1500]; …
HaTiMuX
  • 621
  • 2
  • 10
  • 22
0
votes
1 answer

Android VpnService: Reading from Tun device hangs

My app is using VpnService for traffic interception. What it does: 1.Reads from Tun device in a loop: while (started && tunDevice.valid()) { final byte[] bytes = tunDevice.read(); IpPacket packet = PacketFactory.createPacket(bytes); if…
user578468
  • 9
  • 3
0
votes
1 answer

tun device: message is not received by server process

I set up two tun devices. The data that is written to each tun device is forwarded over a UDP socket to the other tun device using a simple loop: // the tuntap device is created using these flags ifr.ifr_flags = IFF_TUN | IFF_NO_PI; [...] fd_set…
manuels
  • 1,511
  • 3
  • 14
  • 26
0
votes
1 answer

10G Linux VPN performance

I have a Linux box wich has several 10 Gbe interfaces. What I want is to make a crypto-tunnel that has an ability to process 10 Gbit/s traffic as well as 10 Gbit/s router/firewall. There are some ways to achieve this but as I see it all the ways are…
Ilya Matveychikov
  • 3,936
  • 2
  • 27
  • 42
0
votes
1 answer

Linux: How to simulate incoming packets on an interface?

How can I simulate some incoming traffic on a specific software interface? The reason for this need is that we have a couple of software interfaces between Ether level and IP level, which will parse our own L2.5 headers along the network stack, i.e.…
wei
  • 6,629
  • 7
  • 40
  • 52
0
votes
1 answer

TUN/TAP write back to tunnel

My app is using a TUN say tun0. In the design, my app will receive an UDP which includes an full IP layer, then I will take the IP layer out and then use 'file write' to put them into my own tun0 device, supposedly in design, I should can read the…
Yang
  • 1,285
  • 1
  • 10
  • 14
-1
votes
1 answer

CoreOS - expose host ports to VPN

I run docker Openvpn container in CoreOS: docker run --cap-add NET_ADMIN --device /dev/net/tun ... Container connects to VPN as client and other VPN clients can ping the container. It runs normal openvpn process inside it with dev tun option in…
Croll
  • 3,631
  • 6
  • 30
  • 63
-1
votes
1 answer

Not able to forward traffic from `tun` interface to `lo`

Originally asked here: https://networkengineering.stackexchange.com/questions/56278/not-able-to-forward-traffic-from-tun-interface-to-lo I am writing a small VPN server, in which for a certain ip address, I am passing the traffic through an http…
Akshay Deo
  • 528
  • 1
  • 6
  • 22
-1
votes
1 answer

read(2) on Tun fd returned zero

In my application, a Tun interface was created and the process keep reading the associated fd with read(2) in a select(2) loop. But, when I was debugging an issue in the application, I found that in some moments the read(2) operation on the Tun…
Woody Wu
  • 358
  • 3
  • 13
-1
votes
1 answer

How can I modify, compile and install tun.ko?

I've never compiled a single kernel module. I would like to understand how to change the source of a kernel module, compile and install it on Debian SO. Can someone illustrate the steps or tell me a tutorial about it? Thank you and everyone.
Phocs
  • 2,430
  • 5
  • 18
  • 35
-2
votes
3 answers

SQL query optimize for update

This query take long time to update I would love to optimize this query, your help will be appreciated. DECLARE @text1 NVARCHAR(50) = N'test1' DECLARE @text2 NVARCHAR(50) = N'test2' DECLARE @text3 NVARCHAR(50) = N'test3' DECLARE @text4 NVARCHAR(50)…
John
  • 1
-2
votes
1 answer

How to enable TUN on Debian VPS?

I have a VPS with Debian7 Need to setup OpenVPN on it So I had installed and configured OpenVPN but now um stuck with TUN error. lsmod | grep tun - returns empty, so I need to load tun module to kernel. modprobe tun - returns this modprobe: ERROR:…
Supply
  • 51
  • 2
  • 13
-3
votes
1 answer

IP needed on Linux bridge between 2 TAP interfaces?

I am trying to setup openvpn on a server so that I have 2 different tap interfaces (tap0 and tap1) and then a bridge connecting those interfaces. The idea is that a client on tap0 will be able to talk to a client on tap1 and vice-versa. There is no…
Alexandre Thenorio
  • 2,288
  • 3
  • 31
  • 50
1 2 3
…
9
10