I'm believe that the loopbacks your are seeing are the keep-alive frames
being sent out on the LAN. They should have the same source and
destination MAC address with an ethertype 9000 or SNAP 9000 value.
PS: you may want to verify the type/Snap value. 0x9000 is from memory.
It's a good question. Everyone is bound to see them on the sniffers at
some time.
DaveC
Tan Chee Leong wrote:
>
> Hi,
>
> I have been looking at the sniffer output and found that my router keeps
> sending out a "LOOPBACK" packet whose source and dest mac address is the
> router interface itself. It is sent periodically at 10 sec interval. Any
> way to turn this off?
>
> Sorry that it is not a study question.
>
> Cheers,
> Chee Leong
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