I am using wireshark to diagnose a WiFi problem at my house. I turn everything off, except me of course, and traffic looks normal.

However, when I turn my iPhone on, the router instantly starts sending ARP packets to the IP address. Even when I have WiFi turned off!

Why is this happening?

migrated from superuser.com May 17 at 6:06

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  • 1
    It’s starts sending ARP traffic to WHAT IP address? If the WiFi on your phone is off, it doesn’t have an IP address. – Appleoddity May 17 at 3:05
  • Did you try putting the phone into Airplane Mode? – Gummibando May 17 at 7:47

Turning WiFi off on the iPhone means the device shuts down the radio - it means it doesn’t establish a network connection and route traffic.

We would need to see what “the IP address” is and know details about your network to dig deeper, but here are how the system is designed. WiFi can work in airplane mode and turning off wifi is more like releasing DHCP reservation than not broadcasting.

It also matters which iPhone and which iOS you have.

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