netdev - Problem with tap interface: link is not ready

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Date:	Mon, 23 Sep 2013 16:51:47 +0100 (BST)
From:	Dani Camps <danicamps81@...oo.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Problem with tap interface: link is not ready

Dear all,

I am not sure that I am addressing the correct mailing list. In case I am not, please accept my apologies.

I am trying to create a virtual tap device that I want to add later on to a bridge. My problem is that the tap interface always appears with state disabled if I do a ´brctl showstp br0´, and no traffic reaches the bridge. After some investigation I found out that the tap interface is never up. How can I bring the tap interface up?

These are my detailed steps:

sudo tunctl -t tap0
sudo ifconfig tap0 192.168.0.2/24 up

But when I look at dmesg I get:

 ADDRCONF(NETDEV_UP): tap0: link is not ready

Nevertheless if I do 'ifconfig tap0' it seems to indicate that the interface is up:

tap0      Link encap:Ethernet  HWaddr 72:a0:fb:88:95:44
          inet addr:192.168.0.2  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

But I never see a message in dmesg saying "tap0: link becomes ready." And when I add the tap0 interface it always appears disabled, so I think that the interface is never really up.

My kernel is 3.0

Any help to bring up the tap interface is much appreciated.

Best Regards

Daniel
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