Questions tagged [tap]
The tap tag has no usage guidance.
91
questions
7
votes
2
answers
32k
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 (...
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 ...
0
votes
0
answers
91
views
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 ...
0
votes
1
answer
326
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 ...
0
votes
0
answers
52
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 ...
0
votes
0
answers
64
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 ...
0
votes
0
answers
103
views
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 ...
0
votes
0
answers
289
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.
+-----------------...
0
votes
2
answers
178
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 ...
0
votes
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 ...
4
votes
2
answers
18k
views
OpenVPN Linux Client does not bring up tap0 interface
I have an OpenVPN client on Linux connecting to an OpenVPN server. The server assigns IPs via DHCP, thus I connect using the tap interface rather than the tun interface.
OpenVPN connects, ...
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 \
-...
0
votes
1
answer
2k
views
What is th tap100i0 device on my debian with KVM?
I want configure a network for virtual machines on KVM. I created a bridge. But I found a new tap100i0 devise was created. Should I take it into account to get the virtual network running?
0
votes
1
answer
2k
views
Multiple TAP devices on OpenVPN Server
So we have a number of clients that have their own VPS instances which we host via Proxmox. The clients servers are all behind a NAT firewall and we forward ports per client request to our various ...
2
votes
1
answer
3k
views
Openvpn limit bandwidth
I would like to ask you a question concerning openvpn and the possibility to increase the bandwidth in case I want to transfer files.
I have an openvpn server via which I connect to my data center. ...
0
votes
1
answer
184
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 ...
0
votes
1
answer
3k
views
Tap interface within a virtual machine has NO-CARRIER
I am trying to hook up a virtual machine to a host using openvpn.
When i create a tap interface within the virtual machine using:
/usr/sbin/openvpn --mktun --dev tap1
The state of the tap interface ...
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 ...
12
votes
2
answers
14k
views
Ping not working from tap interface attached to bridge interface with ip on same subnet as that of bridge to outside
My requirement is to create a multiple tap interfaces, each with ip address on same subnet.
I tried this by creating a bridge
br0 (192.168.1.199)
___________|...
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 ...
-2
votes
1
answer
702
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 ...
0
votes
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 ...
2
votes
2
answers
4k
views
OpenVSwitch between namespaces
I'm trying to configure a bridge between two TAP interfaces each created inside their own network namespace, on Linux.
I'm using OpenVSwitch as software bridge.
These are the steps that I believe ...
0
votes
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 ...
1
vote
0
answers
217
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 ...
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 ...
2
votes
0
answers
160
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 ...
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
+--------+ +----------+ +-----------+ +---------+ ...
0
votes
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 ...
4
votes
3
answers
12k
views
Assign static IPs to tap clients in pfSense's OpenVPN server
I am trying to set up a pfSense server with OpenVPN.
The OpenVPN will use the tap interface, tun clients are no option for us.
The LAN network is 10.0.0.0/24, the pfSense machine is 10.0.0.10 and ...
0
votes
0
answers
734
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 ...
3
votes
0
answers
311
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 <-> ...
3
votes
1
answer
3k
views
Ping (DUP) with Linux bridges and tap devices
https://i.stack.imgur.com/8XLwU.jpg
I have two Linux (Ubuntu 12.04) VM (running on KVM) that networked together using two Linux bridges as shown above. The network interfaces are Linux TAP devices.
...
0
votes
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 ...
3
votes
2
answers
464
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 ...
119
votes
11
answers
286k
views
Should I use tap or tun for openvpn?
What are the differences between using dev tap and dev tun for openvpn? I know the different modes cannot inter-operate. What is the technical differences, other then just layer 2 vs 3 operation. ...
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-...
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 ...
2
votes
2
answers
2k
views
openvpn without tap module? replacement?
I am trying to instal OpenVPN on a special linux distribution that has no tap kernel module, and all howtos available are outdated. I was wondering if there is a way to run OpenVPN without this ...
0
votes
0
answers
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
$ ...
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 ...
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)
...
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 ...
0
votes
1
answer
132
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.
...
0
votes
1
answer
948
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 ...
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 ...
0
votes
1
answer
863
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 ...
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 ...
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 ...
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 ...