Platforms with TUN/TAP drivers include: FreeBSD Linux, starting around version 2.1.60 of the Linux kernel mainline iOS (tun driver only) OS X (native support only for TUN ( utun )) NetBSD OpenBSD Android Solaris Windows 2000/XP/Vista/7/8/8.1/10 QNX

Mainly tun and tap interfaces are used to inject IP packets to/from kernel from userspace. The way this typically works is a /dev entry is created when a process binds to an interface and process can simply read/write from the /dev/ for the packet transfer. A more detailed look at how tun/tap interfaces work is given in this link and it is 48. Tun|Tap Poll Mode Driver. The rte_eth_tap.c PMD creates a device using TAP interfaces on the local host. The PMD allows for DPDK and the host to communicate using a raw device interface on the host and in the DPDK application. The device created is a TAP device, which sends/receives packet in a raw format with a L2 header. The default interfaces file looks like the following: Where auto starts the interface at boot and iface calls the network interface (in this case lo, loopback). All lines beginning with “ auto ” specify the interfaces which will be enabled when running “ ifup -a ”, a command executed at boot. Aug 05, 2009 · # "dev tun" will create a routed IP tunnel, # "dev tap" will create an ethernet tunnel. # Use "dev tap0" if you are ethernet bridging # and have precreated a tap0 virtual interface # and bridged it with your ethernet interface. The configuration file /etc/interfaces also allows setups for the Bootstrap Protocol [6] (bootp), PPP (ppp) as well as IPX [7]. Showing the interface configuration. Up to the release 8 of Debian GNU/Linux use the command “/sbin/ifconfig” to display the interface configuration. See the configuration for the first ethernet interface below.

To put the matter more simply, the TUN/TAP driver creates a virtual network interface on your Linux box. This interface works just like any other; you can assign IP addresses, route to it, and so on. But when you send traffic to that interface, the traffic is routed to your program instead of to a real network.

I successfully managed to get Linux VTI (Virtual Tunnel Interface) working with strongSwan. By using VTI it is no longer needed to rely on the routing policy database, making understanding and maintaining routes easier. Also with VTI you can see the cleartext traffic on the VTI interface itself. Or in other words, the TUN/TAP driver builds a virtual network interface on your Linux host. The interface functions like any other interface, i.e you can assign an IP to it, analyze the traffic, route traffic to it etc. When traffic is sent to the interface, the traffic is sent to your userspace program rather than the real network. There are To put the matter more simply, the TUN/TAP driver creates a virtual network interface on your Linux box. This interface works just like any other; you can assign IP addresses, route to it, and so on. But when you send traffic to that interface, the traffic is routed to your program instead of to a real network. Tuning a network interface card (NIC) for optimum throughput and latency is a complex process with many factors to consider. These factors include capabilities of the network interface, driver features and options, the system hardware that Red Hat Enterprise Linux is installed on, CPU-to-memory architecture, amount of

The network layout is the following: I am using a client to connect to a server which is located behind a NAT. I have forwarded port 1194 on the NAT device and managed to ping the server successfully. Now I would like to route all traffic from my client's eth0 interface to the tun0 interface. Running ifconfig on the client gives:

OpenVPN relies on a driver, and there is no way, given the design of WSL, for WSL to load native Linux Kernel Modules. The ABI facing userspace on Linux is kept pretty stable between Linux Kernels, but the kernel-facing ABI (for drivers and modules) is constantly changing and shifting. Feb 26, 2018 · David Davis, author of "The Gorilla Guide to Linux Networking 101", as he reviews Linux network interfaces and demos working in a debian linux system. Replace it with a rule that allows virtual machines to only access the Internet via the TUN interface. # iptables -R FORWARD 2 -s 192.168.122.0/24 -i virbr0 -o tun+ -j ACCEPT Bypass OpenVPN for a specific Unix user