NLB - Duplicate packets

Hi All,

I am running Server 2012 R2 and I have configured NLB between two of my webservers.

When I ping the NLB IP address from a Mac or Linux box I notice that I get duplicate packets. I send 10 packets and get 20 returns.  Is this normal?  I would have thought the NLB would send the ping to one address to answer not both.

10 packets transmitted, 10 packets received, +9 duplicates, 0.0% packet lossround-trip min/avg/max/stddev = 0.222/1.353/10.805/3.238 ms

Thanks.