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1answer
47 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 ...
1
vote
2answers
61 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, ...
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0answers
9 views

Bridged network tap unable to communicate with client

User has a workstation on OSX that needs to be able to test a variety of VoIP devices by reading all packets sent and received by the test device. Workstation has two ethernet adapters running on a ...
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0answers
27 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 ...
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0answers
85 views

What's the difference between a dummy interface and a TAP interface?

I want to create a virtual NIC on my Xen environment to deploy an internal network where the Dom0 has access. My original plan was to create a TAP interface and call it a day, but I've seen that I can ...
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0answers
104 views

ebtables arp filtering with openvpn tap interface

I want to prevent arp traffic not destined for the remote side going through a openvpn tunnel so I filter arp requests going to none of my own IPs. Server Setup: /etc/network/interfaces auto br0 ...
0
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1answer
236 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 ...
1
vote
1answer
600 views

What exactly happens to packets written to a TUN/TAP device?

I'm trying to send packets to an application listening on eth0 from machine's user-space as if they were coming from a remote machine. What I can't seem to find good documentation for is the exact ...
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0answers
17 views

Can a firewall handle packets being sent to it by a network TAP?

We have the intention of examining incoming mails for security purposes. In order to do so we figured out the solution will include: Network TAP - To copy all SMTP traffic to the firewall Firewall - ...
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0answers
51 views

OpenVPN tunnel not able to support secure connect request

In CentOS 7 host we have installed openvpn package and did create an tunnel using OpenVPN tunneling for eth9 and tap9. Everthing work fine for unsecure connection but when we try to connect to server ...
0
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2answers
243 views

TCP - TAP performance

Linux. Is there a performance loss from using a tap device vs a hardware one like eth0 ? The goal is to create a user space tcp/ip stack and avoid the kernel as much as possible. I would like to be ...
0
votes
1answer
115 views

how to connect/bridge two interfaces on different processes

I have two processes A and B (simulating real hardware device), each with their own TAP interfaces. If I want to send an ethernet packet to A, I send it on interfaceA, and similarly if I want to send ...
0
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1answer
89 views

Openvpn, two tap network adapters

I have installed openvpn client on my pc (windows 7) and I have two tap network adapters. In this way I can open two openvpn connections at the same time. What I would like to understand is how it's ...
0
votes
1answer
2k views

Softether vpn ufw firewall config - is it correct?

I've correctly installed and configured Softether on my Ubuntu 14 x64 VPS in local bridge mode with a virtual TAP interface. What I have now is a fully functioning L2TP/IPSEC server with two network ...
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0answers
85 views

OpenVPN TAP binding order issue

I am running a 64bit Windows 7/8 AD environment using OpenVPN on remote computers to access our network/servers in our main office. Typically, once we install OpenVPN on a new machine and configure ...
0
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0answers
629 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, ...
0
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0answers
366 views

pfSense LAN network unable to communicate with remote network on OpenVPN TAP connection

I set up pfSense to connect to a remote network (192.168.122.0/24) that only accepts tap connections. The connection is being initiated successfully. pfSense (192.168.1.1/24) itself can connect to ...
4
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1answer
2k 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) ...
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0answers
59 views

Setup PERMANENT TAP adapter in VPS without dissapear after reboot

I'm installing Softether in a new VPS and all works fine. System is a CentOS 6.5 32bit. The issue is that after rebooting the VPS the TAP adapter dissapear. I would like to know if I can define ...
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1answer
4k 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 ...
1
vote
1answer
488 views

Ping (DUP) with Linux bridges and tap devices

http://imgur.com/qPoy2QJ 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. The problem ...
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0answers
231 views

TUN/TAP VPN no internet connection

I have set up a tun/tap vpn to a VPS. For this, I created a 10/24 network and gave the server the IP 10.0.0.100 and my client got 10.0.0.200. I can now successfully ping the server / access my mail ...
0
votes
1answer
604 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 ...
2
votes
1answer
616 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. ...
1
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2answers
2k views

Tap0 not receiving traffic

I have created a tap device tap0 address 10.2.1.4 and added it to a host bridge br1 with address 10.2.1.1 I have "nc 10.2.1.4 -l 1234" running on the host and from another machine I do a "nc ...
0
votes
1answer
201 views

Unbridged tap device

Good UTC evening! I've created a tap0 device on my host, it looks like: tap0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 inet 10.0.0.1 netmask 255.255.255.0 broadcast 10.0.0.255 ...
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0answers
338 views

OpenVPN bridging for Xen VMs

I have a following situation and need your help. My client has several servers-routers in different GEO regions and some servers within one DC which are used for a Xen virtualization each. Routers ...
0
votes
1answer
267 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?
1
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1answer
1k views

Passive ethernet tap [closed]

I'm having an hard time figuring out why can't I capture the packets flowing between two devices, in both directions, using a self made Ethernet tap, with copper cable, which looks just like this one: ...
2
votes
1answer
2k 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
1answer
562 views

./pox.py log.level --DEBUG forwarding.l2_learning not working as expected

I have installed openvswitch on my PC with runs Ubuntu 12.04.I also have virtual box running on my PC with 3 virtual machines (Ubuntu 12.04) running on them. are named vm-1 vm-2 vm-3 I have ...
0
votes
1answer
241 views

Is there a way to allow specific permissions to a non-root user?

I have a program that, at some point, create/destroys tun/tap virtual adapters. Obviously, for these specific operations this program requires root privileges. According to the program ...
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2answers
223 views

VPN with authentication/encryption with separate tap interface for each client

is there any VPN program that handles client authentication, data encryption and ends in a tap interface for every authenticated client? I need 1 shared UDP port (VPN service port) to which clients ...
0
votes
1answer
245 views

Where is the userspace used by TUN/TAP?

When I put data on a wire in qemu what sets the upper limit on the rate of data I can transmit? The situation is I set up two machines A and B create two tap interfaces openvpn --mktun ...
0
votes
1answer
150 views

OpenVPN not acquiring IP on mac client

I have an interesting problem. I can confirm that the OpenVPN server is working because I can connect successfully on other Windows machines. On my personal mac laptop though I can connect but the ...
2
votes
1answer
624 views

How to connect a virtual NIC in one QEMU-KVM instance to a virtual NIC in another QEMU-KVM instance without a bridge

Is there a way to connect a Virtual NIC one QEMU-KVM instance to a Virtual NIC on another QEMU-KVM instance. I want to be able to do this efficiently and it may be possible that the 2 instances could ...
1
vote
1answer
2k views

pfSense - OpenVPN - tap - client connection: Default Gateway Error

We have setup a OpenVPN Server on a pfSense v2.0.1 Router with the "OpenVPN tap Bridging Fix package" to build a bridged VPN network. We followed this HOWTO: link Nearly everything workes fine expect ...
8
votes
2answers
2k views

ARP reply vanishes from br0 to tap0 using OpenVPN in bridging mode

I have setup a linux box (on an esxi5) which acts as an OpenVPN server. the server is configured to use bridging for the clients, which essentially works, with one exception. If the client pings some ...
2
votes
2answers
10k views

How do I enable TUN/TAP forwarding?

I have a program which writes packets (destination address 10.3.0.2) to the TUN/TAP interface. Network: host1|tun0----eth1(10.3.0.1)|-------------------host2|eth1(10.3.0.2)| Wireshark captures ...
1
vote
1answer
934 views

IP Packet Capture/Manipulation via TUN/TAP

I'm trying to capture and manipulate incoming IP packets (via eth0 interface) by using a TUN device (since I'm only concerned with IP layer). The first step I think is 1:1 packet forwarding from eth0 ...
0
votes
1answer
448 views

why tun interface in openvpn

can anyone tell me the use of tun interface in openvpn? as far as i read, it is used to tunnel all the traffic from the PC over the ssl tunnel. But incase of VPN, i suppose all the traffic initiated ...
1
vote
1answer
1k views

Check packet vlan tag using Tap virtual interface

I am trying to learn how to implement virtual interfaces using the Tap driver. So far my understanding is that using the tap driver I can create a virtual interface and then have a userspace program ...
0
votes
2answers
915 views

how does openvpn decide which interface to get IP addrs from

Using ubuntu 10.04 on both ends. We have a client and server machine on the SAME network attempting to make a vpn connection. We use the config files from here and made minimal changes. The server ...
7
votes
2answers
16k views

How can I setup OpenVPN with IPv4 and IPv6 using a tap device?

I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): ...
0
votes
2answers
556 views

OpenVPN bridging with venet interfaces

I have a VPS which uses venet interfaces for its (virtual) ethernet connections. I've managed to get an OpenVPN daemon running with tunneling, but not able to do so with bridging (tap). Is it ...
1
vote
2answers
872 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
2answers
577 views

Dynamips and Tap Devices, To and From the same machine

I am setting up a dynamips/dynagen lab and am wondering if there is any way to get traffic to route out one tap devices, go into the lab, and come back to a tap device on the same machine. I have ...
0
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2answers
3k views

Cannot open TUN/TAP dev

Can someone please help me with this? I have a linux 2.6.9 server (I know it's outdated, but it has some special modules and so kernel cannot be updated/recompiled/etc), and I need to have a tun/tap ...
52
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7answers
81k 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. ...