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Old 11-20-2010, 09:50 PM   #1
Registered: Sep 2007
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VMware Duplicated(DUP!) ping responses from hosts in the same LAN

I have a following network setup:

Host machine is a "2.6.32-24-generic-pae #38-Ubuntu" and VMwareŽ Workstation version is 7.1.2 build-301548.
In addition to those three IP addresses(, and seen on a drawing, there are four identical virtual machines inside the machine. Virtual machines are named Olive0-3. Olive0 has IP address, Olive1 has, Olive2 has and Olive3 has All virtual machines are set up like that:

The problem is, that if I ping between those virtual machines, I get duplicated echo-replies. For example:

root@Olive0> show interfaces em0.0 terse                                
Interface               Admin Link Proto    Local                 Remote 
em0.0                   up    up   inet            
root@Olive0> ping source                    
PING ( 56 data bytes                       
64 bytes from icmp_seq=0 ttl=64 time=0.660 ms            
64 bytes from icmp_seq=0 ttl=64 time=0.737 ms (DUP!)     
64 bytes from icmp_seq=0 ttl=64 time=0.752 ms (DUP!)     
64 bytes from icmp_seq=0 ttl=64 time=0.764 ms (DUP!)      
--- ping statistics ---                                    
1 packets transmitted, 1 packets received, +3 duplicates, 0% packet loss
round-trip min/avg/max/stddev = 0.660/0.728/0.764/0.041 ms               

There are no problems if I ping, or from one of the Olive virtual machines. I tried to analyze this problem using tcpdump utility:

Any ideas, what might cause duplicated packages between virtual machines?
Old 11-21-2010, 04:30 AM   #2
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Did you clone the first Olive machine to make the rest? .. look for duplicate mac addresses
Old 07-02-2015, 08:36 PM   #3
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Registered: Jan 2009
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Still the same situation in VMWare Workstation 10 on Windows 7.

Googled for many pages; I just get it fixed by removing all "Incoming Connection" in Network Connections.

Just put here for a reference.


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