Hi, i trying to use openvpn from optware-ng environment on my android box.
I can install it but when i try to launch i receive error on TUN/TAP use, seems that doesn't present.
Optware-ng on android isn't really supported, though most Optware-ng packages can indeed run on android too. I suspect that your firmware is missing tun.ko kernel module. You can look here for possible solution
armando-basile
commented
7 years ago 
alllexx88
Hi, i trying to use openvpn from optware-ng environment on my android box. I can install it but when i try to launch i receive error on TUN/TAP use, seems that doesn't present.
during install it say: Installing openvpn (2.2.0-2) on /opt/. Downloading http://ipkg.nslu2-linux.org/optware-ng/buildroot-armeabihf/openvpn_2.2.0-2_arm.ipk. openvpn: unsatisfied recommendation for kernel-module-tun ...
could you help me ?
if problem is openvpn, i could also try to use another vpn client but i founded only this.