[ovs-discuss] can not create device problem

Jesse Gross jesse at nicira.com
Wed Jun 2 01:27:27 UTC 2010

On Sat, May 29, 2010 at 5:21 AM, 蒲彦 <yan.p.bjtu at gmail.com> wrote:

> Dear all,
> I feel very strange to see a message like this when I I try connect
> datapath to controller with ovs-openflowd
> May 29 20:57:22|00001|openflowd|INFO|Open vSwitch version 1.0.0
> May 29 20:57:22|00002|openflowd|INFO|OpenFlow protocol version 0x97
> May 29 20:57:22|00003|ofproto|INFO|using datapath ID 0000002320ba543b
> May 29 20:57:22|00004|rconn|INFO|tcp: connecting...
> May 29 20:57:22|00005|netdev|WARN|attempted to create a device that may not
> be created: tap0
> May 29 20:57:22|00006|ofproto|WARN|ignoring port tap0 (1) because netdev
> tap0 cannot be opened (No such device)

This was a known bug that we've had for a while.  I just checked in a fix so
you should no longer see this problem if you pull the latest from the
"master" branch of the git repository.

Alternately, we generally recommend ovs-vswitchd over ovs-openflowd as it is
more full featured (and it never had this problem).  Is there a reason why
you need to use ovs-openflowd?
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