Questions tagged [tap]

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I cannot see my OpenVPN TAP adapters in Hyper-V external switch bridging

I cannot see my OpenVPN TAP adapters in Hyper-V external switch bridging. Is it even supported in Hyper-V? I do not see any documentation where it says it is either supported or not. I have Windows 11 ...
falhumai96's user avatar
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1 answer
296 views

SSH Ethernet Forwarding Does Not Seem to be Working

I have Ubuntu 22.04 on both the client and server. I have set PermitTunnel yes in sshd_config in both the client (I might not need it on the client) and the server. I have also set Tunnel yes and ...
falhumai96's user avatar
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49 views

Configure network stack to consume data from TAP device, so that application can operate as if the data was intended to it

I have two devices communicating, A and B over udp. In between there is a tap device, where C is connected. In order for C to be able to receive the traffic it needs to set the same ip and mac address ...
Aleksandarf's user avatar
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60 views

Redirect traffic in "sniff/tap?" mode to specific ip address(es), that is: rewrite destination headers to target other machine(s)

I have incoming traffic on eth1 (vlan id 201) which is emitted by another machine which is doing sudo tcpreplay -x 0.01 --loop=0 --intf1=eth12 Wireshark_bidirectional_data.pcap I would like to ...
Aleksandarf's user avatar
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Does Linux tap interface support tcp segmentation on ipip network traffic

Recently I experienced an issue on running kubernetes slaves on a VM with calico ipip tunnel as the network connection protocol to interconnect the kubernetes nodes. The current symptom (with the ...
lordofire's user avatar
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270 views

Creating a TAP network device in GCP VM

I am trying to create a QEMU VM within a GCP VM. I want the QEMU VM to use TAP network device to communicate with the host and external world. My desired set up looks like below. +-----------------...
onlygo's user avatar
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server remot access using VPN FW - TUN vs TAP

I'm trying to improve my home Firewall set up and I'm trying to figure out the best VPN configuration. GOAL: In order to reduce the open ports of my home webserver I thought to use SSH and webmin ...
gipsea's user avatar
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1 answer
177 views

is a tap interface on linux vulnerable to snooping attacks

If you have multiple VM's on a Linux host machine, and use a single tap interface on that host machine, is that network vulnerable to spoofing/mac spoofing attacks like a normal Ethernet network would ...
Tom Ribbens's user avatar
2 votes
2 answers
1k views

qemu commandline can't see /dev/net/tun

i am newbie with qemu and libvirt. I hit the issue with virsh and qemu, especially with tun interface setup. Once i run qemu-system-x86_64 \ -nographic -enable-kvm \ -cpu host -m 2048 \ -...
raphaelnadal's user avatar
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2 answers
172 views

Gentoo hangs when adding main interface to the bridge

I've VPS on WEDOS serverhosting, Gentoo there. 5.4.38 kernel. I've a network interface eth0, I need to bridge it with another one (from openvpn). Starting with adding only one interface: brctl addbr ...
aikipooh's user avatar
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1 answer
698 views

Bridging with OpenVPN on a VPS without an actual LAN on the server side for LAN Gaming [closed]

I am trying to set up an OpenVPN-Server on a VPS that allows LAN Broadcasts between the connected clients. Now I read that you need bridging for that. But in my case the VPS has no LAN. It is just the ...
Kloud's user avatar
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1 answer
1k views

Two tap device can't communicate over bridge

I want to exchange Ethernet Packet between two tap device(for implementing TCP/IP protocol stack in usermode). The problem I encountered is that tap1 and tap2 only can receive broadcast packet through ...
Miracle's user avatar
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0 answers
2k views

ARP Reply is not forwarded to TAP device through Linux Bridge

Create two TAP devices, each of which will be read and written by the userland protocol stack. In addition, the two TAP devices are bridged by the Linux Bridge. The script to prepare the environment ...
Shikugawa's user avatar
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1 answer
2k views

How to enable external access to the Virtual machine on private link?

I would like to benchmark virtual networking of KVM-QEMU. For this purpose, I connect two servers (server 1, and server 2) with one wire. I use server 1 to run the QEMU VM and I want to access this VM ...
Mehrshad's user avatar
  • 103
3 votes
1 answer
5k views

Add persistent bridge and tap in ubuntu 20.04 server

I'm trying to create a bridge whose interface is a tap, both with static IPs, and have them persist across reboots. In Ubuntu 14.04.6 LTS, this could be accomplished by editing /etc/network/interfaces ...
Leshawn Rice's user avatar
1 vote
0 answers
208 views

Advice required for sending STP BPDU traffic between tap interfaces connected by common bridge

Need advice for the bridge tap interface to run stp traffic. created the tap interface and bridge   Have come across stp BPDU is consumed by bridge. i'm running the scapy on the host, however i'm not ...
Santosh Kumar's user avatar
2 votes
0 answers
155 views

Is there a tool I can use to test out multiple vpn tunnels in one machine?

I use wget -q -O https://checkmyip.com/csv to determine if I am connected to a VPN but I want to verify multiple VPN tunnels on the same machine. Is there a tool that can allow me to send a command ...
LeanMan's user avatar
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0 answers
1k views

Attach a VM to a host TAP or TUN device

I'm working on a project whilst in lockdown in England, and I am hoping someone can offer some advice? I have a machine with 5 physical eth interfaces on Linux Mint, 20.04. All eth interfaces ...
Bon's user avatar
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1 vote
1 answer
1k views

two tap device connect each other in same pc

What I want to implentent is something like below. 192.168.1.1 192.168.1.2 +--------+ +----------+ +-----------+ +---------+ ...
randomeval's user avatar
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716 views

macvtap interface associated with a VM on a host cannot ping host eno1 IP

VM interface XML config has source device pointing to the host management interface eno1 that is configured with IP of 10.134.159.48/24 When the VM is launched a macvtap interface gets created for ...
lakshmi bangalore's user avatar
3 votes
0 answers
307 views

How to migrate OpenVPN architecture TAP to TUN

I did a tunnel system with OpenVPN to let a distant client act like a private network client to access private resources. It uses a client on the private network as a gateway. DistantClient <-> ...
Doubidou's user avatar
  • 131
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0 answers
1k views

OpenVPN TAP without bridging

I'm trying to make use of my VPS as OpenVPN server for "LAN" gaming which involves broadcasts, so I need to configure TAP. Typically, when I look up some examples of tap configuration, it uses ...
Palo's user avatar
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3 votes
2 answers
458 views

Windows: Send all network traffic from script/app through specific TAP adapter

I have created a script in Node.js to remotely manage a server. To work the script needs to be connected to a VPN. The VPN it needs to connect to is different from the one I want Windows to use. Both ...
Settings Menu Hard to Find's user avatar
1 vote
2 answers
1k views

OpenVPN - client connected to server, but cannot ping server or server's LAN

I am trying to ping the network of the Ubuntu server from Windows 7 (client). Both Ubuntu and Windows are clients on another OpenVPN server with the option client-to-client. The client can connect ...
xinthose's user avatar
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78 views

Understand linux bridge tunneling configuration

I have a VPN software that creates a tap device connected to a bridge: $ brctl show vpnbr bridge name bridge id STP enabled interfaces vpnbr 8000.6630fabc3f2b yes tnl-2c5a50e $ ...
alnet's user avatar
  • 128
3 votes
1 answer
3k views

Forwarding ICMP response to TAP interface

I am trying to do a test where I forward ICMP responses to a TAP interface. I created a TAP interface and assigned it the address 10.0.4.1/24. My linux setup uses the interface enp0s3 as the default ...
Jake's user avatar
  • 145
3 votes
1 answer
4k views

Multiqueue tun/tap interface

I am trying to understand how Multiqueue tuntap interface works. Following the instructions provided at: https://www.kernel.org/doc/Documentation/networking/tuntap.txt I was able to create multiple ...
Deys Nima's user avatar
0 votes
1 answer
131 views

Can only access the gateway at the end of my ssh ethernet tunnel why?

I have a remote private network connected to the internet via a Linux gateway. The gateway has the following arrangement: eth0 - external IP br0 - with eth1, and tap0 devices added to the bridge. ...
Keeely's user avatar
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0 votes
1 answer
931 views

How to redirect traffic sent to tap to a specific ip addr

I created a tap device using the following commands: sudo ip tuntap add mode tap tap7 sudo ip link set tap7 up sudo ip addr add 77.0.0.1/24 dev tap7 Now, I am using c++ sockets programming to write ...
Ahmed Hussein's user avatar
0 votes
1 answer
1k views

OpenVPN server with two tap interfaces, how to allow tap0 to see tap1

I'm new to OpenVPN but have managed to install it on an Ubuntu machine. The requirement is to allow Mikrotik and then laptop clients to connect to the VPN. I managed to make this work by running two ...
Leon Vismer's user avatar
7 votes
2 answers
31k views

Cannot ioctl TUNSETIFF tap0: Device or resource busy (errno=16)

I'm having this weird issue that when I run bridge-start together with openvpn, the service won't start. If I don't let openvpn run bridge-start, and add the necessary interfaces (tap0, br0) manually (...
Lethargos's user avatar
  • 505
0 votes
1 answer
857 views

SSH TAP tunnel & multicast groups

Is it possible to do UDP multicasting over an SSH TAP tunnel? I have set up a TAP tunnel using SSH between my Ubuntu PC and a Raspberry Pi sitting in a remote office, using this command: $ ssh -o ...
Tom's user avatar
  • 327
1 vote
1 answer
5k views

Host to guest connection via SSH (using qemu vm)

I am having trouble to enable a host-to-guest communication using qemu VMs. The goal is to connect via SSH from the host to the guest VM. I have the following setting: host: local access to SSH ...
Zee Age's user avatar
  • 11
2 votes
1 answer
6k views

OpenVPN TAP vs TUN in parallel

I have a few questions about our existing OpenVPN server setup and a requirement that we have to expand our access. Our current setup is as follows: 1 OpenVPN server (in TAP mode) Multiple VM ...
Adam Blalock's user avatar
0 votes
1 answer
1k views

How to set up single client TAP/TUN on the client for my OpenVPN?

My laptop OpenVPN client establishes a TAP device. My client config is TUN, though. This devices shows under ifconfig /ALL with the IP 10.8.0.6 and a subnetmask of 255.255.255.252. (!!!) This ...
bomben's user avatar
  • 115
2 votes
1 answer
2k views

Bonding over OpenVPN, for fault tolerance

I have two OpenVPN server, and two machines connecting to them. Server 1 openvpn address: 10.158.1.1 Server 2 openvpn address: 10.158.2.1 Machine 1 has address 10.158.1.11 on server 1, 10.158.2.11 ...
WorK's user avatar
  • 31
0 votes
1 answer
2k views

OpenVPN bridged client can contact local router, but not other hosts

I have an OpenVPN Server running on Ubuntu 16.04.1. I have set this up as a TAP/Bridging server and added bridging configuration to my /etc/network/interfaces file. My client is a Windows 10 laptop. ...
DBrowne's user avatar
  • 101
2 votes
1 answer
2k views

Issues setting up TINC on Mac OSX 10.12.2

I have TINC setup on a few linux boxes and they are working great. linux001 (static ip vps - 10.0.0.1) macosx002 (connects to linux001 - 10.0.0.2) linux050 (connects to linux001 - 10.0.0.50) I also ...
CaffeineAddiction's user avatar
2 votes
0 answers
715 views

Tap interface is not receiving packets

I'm configuring a tap interface and trying to send and receive packets through it, i configure it like this: ip tuntap add name tap0 mode tap multi_queue ip link set tap0 up i'm using scapy to send ...
Kareem Khaleel's user avatar
0 votes
2 answers
2k views

centos-7 missing /dev/net/tap

Going ls -l /dev/net shows the tun device (device 10,200) but there is no tap entry. Any ideas on how to get it working? find /dev -name \*tap\* finds nothing CentOS Linux release 7.1.1503 (Core) ...
mrieker's user avatar
1 vote
1 answer
4k views

Linux + OpenVPN; bridge interface not responding to ARP

I am trying to set up an OpenVPN connection with a Layer2 ethernet bridge to bridge two LANs. ARP responses do not seem to being generated correctly... Please note I want to create a full Layer2 ...
Jonathan Preston's user avatar
0 votes
1 answer
1k views

Restrict client IP address on OpenVPN using TAP interface

I've set up an OpenVPN + PF setup on a FreeBSD 10.3 server. Clients to my VPN include administrators, which should have full access to the network and untrusted users who should ONLY be able to ...
Imanol Barba Sabariego's user avatar
2 votes
1 answer
4k views

icmp ping reply not received by ping process, seen by tcpdump/wireshark

I'm having an issue with getting the actual ping process to receive the reply even though I can clearly see the response in the tcpdump output. I'm running on: Mac OS X 10.11.4 El Capitan Bridge ...
McBirdy's user avatar
  • 21
3 votes
1 answer
2k views

Openvpn tap interface configuration gets self assigned IP

I have a strange misconfiguration on my openvpn tap network. Clients can connect and get there IP address in 192.168.42.x as intended, but after few seconds another address gets assigned to it, self-...
vitaminwater's user avatar
0 votes
1 answer
506 views

OpenVPN TAP network

I have a question about the OpenVPN in TAP configuration. I want to access local resources through VPN connection from outside network. I think I need TAP configuration, because I want to send ...
Peef's user avatar
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1 vote
1 answer
579 views

How to correctly set up a bridge interface in GCE

I'm trying to set up a bridge interface as described in many docs, for instance: https://help.ubuntu.com/community/OpenVPN My setup in identical to that one, except obviously I used my GCE internal ...
FuriousGeorge's user avatar
0 votes
1 answer
42 views

Endpoint to security gateway tunnel

I want to establish a connection between the client and the proxy server through a VPN tunnel in android device. I want to do this at layer 2 or 3 , where a packet can captured and encrypted. Please ...
user2044000's user avatar
0 votes
1 answer
3k views

Ubuntu + bridge +qemu + tap + virtio dropping packets

I've got what I think is the standard qemu bridge/ubuntu tap interfaces set up running variety of VMs on my Ubuntu host. All the VMs I'm having trouble with are Windows images. I have researched this ...
user334685's user avatar
1 vote
2 answers
98 views

Public IP is appearing while tapping network instead of private IPs

In my test environment, I connected a tap switch in front of the wireless router. This tap has 5 ports and port 5 is the mirror port which is connected to a computer. At port 1, modem is connected, ...
user3806770's user avatar
1 vote
0 answers
60 views

Create 3 virtual interfaces that can ping6 each other

In Linux, how can you create 3 virtual interfaces that are bridged together through a virtual switch so that they can ping6 each other? What I did: tunctl -t tap1i tunctl -t tap2i tunctl -t tap3i ip ...
capr's user avatar
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