>>>>> Richard Rauch writes:

Richard> That's kind of what I figured.  But then, why tell ...253 to
Richard> tell itself?

Unless I misremember this is what is called "gratuitous ARP", an
interface arps for itself simply to announce to the world "here I am,
now at this (possibly changed) mac address". It will give listeners a
chance to update their arp tables.

Kind regards,

        -- Urban