Sorry for the slow reply.

We run mainly ESXi (the bare metal version of VMware, not the desktop versions) 
but I do remember seeing something sort of similar on a desktop version ages 
ago. Basically we narrowed it down to a Windows driver bug on the host system's 
ethernet card. It was basically reflecting back everything it transmitted into 
the receive queue. This was before IPv6 was in use here, but I remember it 
breaking a file sharing protocol (SMB? AFP?) that also didn't like seeing its 
own multicasts/broadcasts echoed back to itself.

By any chance is this on a system using WiFi rather than wired ethernet? Many 
routers/access points/wifi adapters have problems with the idea of VMware's 
"bridged mode" networking - they expect only one MAC per station and do not do 
the right thing in some places.

I don't have an answer for you, but I'd look at the physical networking 
card/adapter on the host OS first if I were troubleshooting this. Updated 
driver/replace with something else/etc.

-- Kevin

On Jul 23, 2013, at 12:44 AM, Zaphod Beeblebrox <zbee...@gmail.com> wrote:

> What to do when you don't trust the interface?  VMWare is obviously emulating 
> the hardware and their interpretation of what the hardware "is" is possibly 
> different from ours.
> 
> If I boot single-user and tcpdump the interface, I see two transmitted 
> solicitations.  The kernel claims to have sent one.
> 
> My concern: is the vmware interface reflecting the solicitation packet 
> because it is a broadcast packet?
> 
> To determine this, I've gone over the tcpdump and pcap-filter man pages to 
> look for a way to only dump packets leaving from or arriving at an interface. 
>  Can this be done?
> 
> If VMWare is reflecting the packet back, I'm curious as to how we can fix 
> this.
> 

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