[Qemu-devel] Problems on vlan-based vnics!

[cauchy-love]

hi stefan.
   I have setup a VM on a server with two NICs (eth0 and eth1).  eth0 is 
connected with vlan22 and eth1 is connected with vlan33. I then added eth0.22 
to br2  and eth1.33 to br3. after that tap2 and tap3 were added to br2 and br3 
respectively. When i start up the vm,  the network connection is failed if tap2 
and tap3 are allocated to this VM while it is ok if i only allocate one tap to 
this VM. It is shown that the packets were all routed to one NIC. So what is 
the problem?
yi




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在 2015-06-22 20:13:20，"Stefan Hajnoczi" <address@hidden> 写道：
>On Sat, Jun 20, 2015 at 02:26:29PM +0300, Shmulik Ladkani wrote:
>> Currently, MAX_NICS is hardcoded as 8.
>> 
>> Add a configuration option '--net-max-nics' so one can override the
>> default.
>> Unless specified, default value is kept as 8.
>> 
>> Signed-off-by: Shmulik Ladkani <address@hidden>
>> ---
>>  configure         | 7 +++++++
>>  include/net/net.h | 2 +-
>>  2 files changed, 8 insertions(+), 1 deletion(-)
>
>The -device e1000,netdev=tap0,id=e1000-nic0 syntax is preferred to -net
>nic syntax and does not have the 8 NIC limit.
>
>Please use the -device syntax instead of -net.  Emulated NICs that
>support virtio_net_hdr offload also perform better with the -device
>syntax because -net nic does not allow virtio_net_hdr offloads.
>
>If you think this patch should be merged, please explain the use case.