Hi, there,
The DUP ping problem is quite an old problem, and I googled it for half a day, 
still got not answer. Because my environment  is a little different that 
others'.

I have installed Virtualbox 4.1.10 on Ubuntu Oneiric(host), and installed a 
Ubuntu Precise on VB as a guest.  I have created tap0 device using openvpn 
utility and br0 bridge using Open vSwitch. In the network setting of VM, I 
choose the tap0 as the bridged adapter. The ip setting are as follows:
------------------------------------in my host:
sudo ifconfig br0 192.168.1.24 netmask 255.255.255.0
eth0 and tap0 got no ip address assigned
In the guest, i.e. VM:
sudo ifconfig eth0 192.168.1.26 netmask 255.255.255.0
------------------------------------
After that, my guest is able to reach the outside network, and the machine 
which resides in the same LAN, says it's ip address is 192.168.1.14, 
could also found my guest. The PROBLEM is:
when I ping the 192.168.1.14 from my guest, the ICMP reply is 
always duplicated. Why?
Any ideas will be appreciated.

Cheers,

Jfhu
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