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Cannot set tx queue length on tun0: Operation not permitted (errno=1)

I’ve had this issue before, and now I have it again. I have no idea how to correct it properly.

I get this problem when I use systemctl to start openvpn, and also when I test it manually for debugging. To test manually I use:

openvpn --rmtun --dev tun0
openvpn --mktun --dev tun0 --dev-type tun --user tunnel --group tunnel
cd /etc/openvpn
sudo -u tunnel openvpn /etc/openvpn/openvpn.conf

This is an excerpt of openvpn’s output:

TUN/TAP device tun0 opened
Note: Cannot set tx queue length on tun0: Operation not permitted (errno=1)
do_ifconfig, tt->did_ifconfig_ipv6_setup=0
/usr/bin/ip_unpriv link set dev tun0 up mtu 1500
sudo: a password is required
Linux ip link set failed: external program exited with error status: 1
Exiting due to fatal error

What is causing this?

In the past I’ve used:

setcap cap_net_admin=epi /bin/ip
setcap cap_net_admin=epi /usr/sbin/openvpn

But this is not part of the instructions given here: https://www.whonix.org/wiki/Tunnels/Connecting_to_a_VPN_before_Tor

I’ve been struggling with this for over a month now. :frowning:

Never mind, it was my stupid mistake this time. I commented in the wrong lines in tunnel_unpriv. I should learn to read.

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