Running phpvirtualbox VMs and experiencing DUP! packets when pinging

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I've created 2 VMs within phpvirtualbox running on xpenology (package center). When I try and ping an IP from within the VM, I get the following:


user@devvm:~# ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=117 time=12.0 ms
64 bytes from icmp_seq=1 ttl=116 time=12.2 ms (DUP!)
64 bytes from icmp_seq=1 ttl=117 time=17.7 ms (DUP!)
64 bytes from icmp_seq=1 ttl=116 time=17.9 ms (DUP!)
--- ping statistics ---
1 packets transmitted, 1 received, +3 duplicates, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 12.012/14.974/17.925/2.857 ms


If I shutdown one of the VMs and re-run the ping, I get less duplicate packet so I know the virtualization is causing some issue. How do I fix this?




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