Jonathan,
Tim was spot on. Just give the router more time to boot up before starting the Mac. I was powering both on at about the same time.

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On 6/7/2018 12:00 PM, Jonathan Cohn wrote:
Another possibility is that both your router and your ISP are responding to DHCP requests. If you expect your router to be handling DHCP then make sure of the following:

1. Only one device is configured for DHCP on your LAN.
2. That broadcast ethernet packets on your lan do not get sent out beyond it.


On Jun 7, 2018, at 1:47 PM, Tim Kilburn <[email protected] <mailto:[email protected]>> wrote:

Hi,

Sounds like either your Mac was already on when the router started up, or the Mac started up faster than the router.  Two ways to stop that message are to just restart the Mac so that it will get a new DHCP lease from the router, or you can go into System Prefs, Network, then to the Advanced button.  Select the DHCP tab from here and press the "Renew DHCP Lease" button.  This should clear up any confusion.

Later...


Tim Kilburn
Apple Teacher
(with Swift Playgrounds Recognition)
Fort McMurray, AB Canada

On Jun 7, 2018, at 11:20, E.T. <[email protected] <mailto:[email protected]>> wrote:

  I turn my router off at night so its fresh in the morning; Today after restarting the router and booting the Mac, then starting VMware Fusion but not yet running the VM, the Mac popped up a dialog informing me that another device was using the same IP address. I repeated the whole process after turning off the iPhone so there would not br anything else connecting. Same dialog different IP address. Started over with iPhone turned on. No dialog this time.

  Should this happen again, how can I see what might be connected to my Wi-Fi?

  Side note; when I went to menu extras and opened the Wi-Fi item, my phone was listed under Personal Hotspot even though this is not enabled on my iPhone. Is this normal?

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