Wireshark · Wireshark-users: Re: [Wireshark-users] wireshark on windows showing duplicates that are not really duplicates

[Bill Meier <wmeier@xxxxxxxxxxx>]

Robert Guthrie wrote:
>  
> I did a test that involves 3 computers:
> Machine A - Windows IP 9.53.23.38 sending ICMP ping requests
> Machine B - Windows IP 9.48.150.77 receiving ICMP ping requests
> Machine C - Linux machine on the same bridge as Machine A and can see 
> all traffic to/from Machine A
>  
> Running wireshark on machine A shows duplicate ping requests.
> Running wireshark on machine B shows no duplicates, but shows ping 
> requests/replies
> Running wireshark on machine C shows no duplicates.
>  

One thing I note:

The destination MAC address of the ping request is
All-HSRP-Routers_01 (00:00:0c:07:ac:01).

I'm not familiar with HSRP (Hot Standby Routing Protocol) but this 
suggests to me that there's something more going on than just plain 
vanilla Ethernet + IP and so on.

(Maybe someone with HSRP knowledge can jump in and explain what is going 
on).

What network hardware is being used and what is the network configuration ?