Re: /sys/devices/virtual/net/tap0: couldn't determine device driver; ignoring...

[Dan Williams <dcbw redhat com>]

On Thu, 2012-10-25 at 14:13 +0900, Tor Bechmann Sørensen wrote:
> Hello,
> 
> I am facing some problems getting OpenVPN working through
> NetworkManager on Ubuntu 12.10. I am able to connect when using the
> 'regular' OpenVPN client and a config file, but not through NM with a
> similar config. From my investigations so far, it seems that
> the /sys/devices/virtual/net/tap0 device doesn't get created, but I am
> unable to work out why that is happening. I tried putting apparmor
> into complain mode to make sure it wasn't a problem with that. I
> pasted what I believe is the relevant part of syslog below (edited out
> identifiable information). Can anyone help me with some pointers as to
> how to troubleshoot this?

This is the critical line:

Oct 25 13:38:25 havet nm-openvpn[2656]: WARNING: Failed running command
(--up/--down): external program exited with error status: 1

To figure out what's going on, we have to figure out why
nm-openvpn-service-openvpn-helper is exiting.  To do that, as root:

1) killall -TERM nm-openvpn-service
2) find out where nm-openvpn-service lives, usually in /usr/libexec
or /usr/lib/NetworkManager
3) nm-openvpn-service --persist --debug
4) connect your VPN as you normally 

> Best Regards
> 
> Oct 25 13:38:22 havet NetworkManager[952]: <info> Starting VPN service
> 'openvpn'...
> Oct 25 13:38:22 havet NetworkManager[952]: <info> VPN service
> 'openvpn' started (org.freedesktop.NetworkManager.openvpn), PID 2650
> Oct 25 13:38:22 havet NetworkManager[952]: <info> VPN service
> 'openvpn' appeared; activating connections
> Oct 25 13:38:22 havet NetworkManager[952]: <info> VPN plugin state
> changed: starting (3)
> Oct 25 13:38:22 havet nm-openvpn[2656]: OpenVPN 2.2.1 x86_64-linux-gnu
> [SSL] [LZO2] [EPOLL] [PKCS11] [eurephia] [MH] [PF_INET6] [IPv6 payload
> 2
> 0110424-2 (2.2RC2)] built on Oct  8 2012
> Oct 25 13:38:22 havet nm-openvpn[2656]: WARNING: Make sure you
> understand the semantics of --tls-remote before using it (see the man
> page).
> Oct 25 13:38:22 havet nm-openvpn[2656]: NOTE: the current
> --script-security setting may allow this configuration to call
> user-defined scripts
> Oct 25 13:38:22 havet NetworkManager[952]: <info> VPN connection '<I
> removed the hostname>' (Connect) reply received.
> Oct 25 13:38:22 havet nm-openvpn[2656]: LZO compression initialized
> Oct 25 13:38:22 havet nm-openvpn[2656]: Attempting to establish TCP
> connection with [AF_INET]xxx.xxx.xxx.xxx:15001 [nonblock]
> Oct 25 13:38:23 havet nm-openvpn[2656]: TCP connection established
> with [AF_INET]xxx.xxx.xxx.xxx:15001
> Oct 25 13:38:23 havet nm-openvpn[2656]: TCPv4_CLIENT link local:
> [undef]
> Oct 25 13:38:23 havet nm-openvpn[2656]: TCPv4_CLIENT link remote:
> [AF_INET]xxx.xxx.xxx.xxx:15001
> Oct 25 13:38:23 havet nm-openvpn[2656]: [raichu.netlab.jp] Peer
> Connection Initiated with [AF_INET]xxx.xxx.xxx.xxx:15001
> Oct 25 13:38:25 havet nm-openvpn[2656]: TUN/TAP device tap0 opened
> Oct 25 13:38:25 havet
> nm-openvpn[2656]: /usr/lib/NetworkManager/nm-openvpn-service-openvpn-helper tap0 1500 1576   init
> Oct 25 13:38:25 havet NetworkManager[952]:    SCPlugin-Ifupdown:
> devices added (path: /sys/devices/virtual/net/tap0, iface: tap0)
> Oct 25 13:38:25 havet NetworkManager[952]:    SCPlugin-Ifupdown:
> device added (path: /sys/devices/virtual/net/tap0, iface: tap0): no
> ifupdown configuration found.
> Oct 25 13:38:25 havet NetworkManager[952]:
> <warn> /sys/devices/virtual/net/tap0: couldn't determine device
> driver; ignoring...
> Oct 25 13:38:25 havet NetworkManager[952]: <warn> VPN plugin failed: 2
> Oct 25 13:38:25 havet nm-openvpn[2656]: WARNING: Failed running
> command (--up/--down): external program exited with error status: 1
> Oct 25 13:38:25 havet nm-openvpn[2656]: Exiting
> Oct 25 13:38:25 havet NetworkManager[952]:    SCPlugin-Ifupdown:
> devices removed (path: /sys/devices/virtual/net/tap0, iface: tap0)
> Oct 25 13:38:25 havet NetworkManager[952]: <warn> VPN plugin failed: 1
> Oct 25 13:38:25 havet NetworkManager[952]: <info> VPN plugin state
> changed: stopped (6)
> Oct 25 13:38:25 havet NetworkManager[952]: <info> VPN plugin state
> change reason: 0
> Oct 25 13:38:25 havet NetworkManager[952]: <info> Policy set
> 'Ahc2emKm_g' (wlan0) as default for IPv4 routing and DNS.
> Oct 25 13:38:25 havet NetworkManager[952]: <info> Policy set
> 'Ahc2emKm_g' (wlan0) as default for IPv6 routing and DNS.
> Oct 25 13:38:25 havet NetworkManager[952]: <warn> error disconnecting
> VPN: Could not process the request because no VPN connection was
> active.
> Oct 25 13:38:30 havet NetworkManager[952]: <info> VPN service
> 'openvpn' disappeared
> 
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