Apr 10, 2020
What is TUN/TAP? How to enable it in OpenVZ? - Interserver TUN works with IP frames whereas TAP works with Ethernet frames. TUN and TAP devices are most commonly used in two distinct application scenarios: 1) VPN software (such as OpenVPN): In this case, the kernel sends its network packets to the tun or tap devices and the VPN software will then encrypt and forward them to the other side of the VPN openvpn tun/tap dev problem | The FreeBSD Forums Mon Jun 29 14:45:24 2020 us=383329 TUN/TAP device tun0 exists previously, keep at program end Mon Jun 29 14:45:24 2020 us=383549 Cannot open TUN/TAP dev /dev/tun0: Permission denied (errno=13) Mon Jun 29 14:45:24 2020 us=383593 Exiting due to fatal error
In my Ubuntu container I’m trying to connect to my subscription openvpn server with their .ovpn configuration file and when I enter the command to connect I get “ERROR: Cannot open TUN/TAP dev /dev/net/tun: No such file or directory (errno=2)” in the configuration output.
TUN works with IP frames whereas TAP works with Ethernet frames. TUN and TAP devices are most commonly used in two distinct application scenarios: 1) VPN software (such as OpenVPN): In this case, the kernel sends its network packets to the tun or tap devices and the VPN software will then encrypt and forward them to the other side of the VPN openvpn tun/tap dev problem | The FreeBSD Forums Mon Jun 29 14:45:24 2020 us=383329 TUN/TAP device tun0 exists previously, keep at program end Mon Jun 29 14:45:24 2020 us=383549 Cannot open TUN/TAP dev /dev/tun0: Permission denied (errno=13) Mon Jun 29 14:45:24 2020 us=383593 Exiting due to fatal error
Sep 28, 2009
"netvmini" sample from Windows DDK is a rudimental implementation of TAP driver. OpenVPN includes more elaborate implementation called "tapwin32". Regarding the original question - I don't know why TUN and TAP are capitalized, but TUN clearly comes from TUNnel and I suspect that TAP refers to water tap … ししおどし: OpenVPN を TAP（ブリッジ）→ TUN（ルーター） …