[ovs-discuss] can not create device problem

蒲彦 yan.p.bjtu at gmail.com
Sat May 29 12:21:01 UTC 2010

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)

However, I am sure I have tap0 and it is in dp0 by watching
ovs-dpctl show

system at dp0:
    flows: cur:0, soft-max:1024, hard-max:1048576
    ports: cur:2, max:1024
    groups: max:16
    lookups: frags:0, hit:0, missed:665, lost:224
    queues: max-miss:100, max-action:100
    port 0: dp0 (internal)
    port 1: tap0

Any help will be really appreciated~
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