I agree Forrest...the issue they thought they had was actually a device on
switch set to half duplex causing errors...once they changed it to
full...voila...issues cleared up... FactoryTalk Viewpoint working faster
and more responsive.


On Tue, Dec 1, 2020, 3:25 AM Forrest Christian (List Account) <
[email protected]> wrote:

> As others have said, this is a multicast address, used to send a
> 'broadcast' to other interested parties on the local network.   The main
> difference between 'multicast' and 'broadcast' is that in broadcast all
> parties receive it, and in multicast only interested parties receive it.
>  It's more complicated and convoluted than that.   It's generally not going
> to leave your local ethernet segment, although certain routers can be
> configured to forward multicast packets.
>
> It looks like CIP sync uses multicast, and probably other protocols in the
> Ethernet/IP suite.  So I'm guessing it's just one of the enabled protocols
> on the ethernet side of the VFD.
>
> On Mon, Nov 30, 2020 at 12:43 PM Jaime Solorza <[email protected]>
> wrote:
>
>> Running wireshark on a SCADA network and I am detecting a VFD using CIP
>> trying to hit IP 239.192.128.229...
>> I tried looking it up ....says Asis Pacific...
>> Can someone give me more information on this IP?
>> Thanks
>> --
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>>
>
>
> --
> - Forrest
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