Clients with the same MAC address

[Caleb]

On our dashboard under Clients there are two different clients both with the same MAC address. How is this possible and is there a way to reset the data?

Example

iPhone 1 and iPhone 2 both have the same MAC address

iPhone 3 and Note 1 both have the same MAC address

I am trying to enforce policy based on MAC address but since these devices show up in the dashboard with the same mac address it is impossible. How can I trust anything the dashboard is showing me?

Support has advanced my issue to engineering but I am a small fish in a big pond and so I am don't feel this security issue is getting the attention it needs.

Any idea's on what could cause this or how to raise the importance of this issue with support?

[Adam]

Do you have any Layer 3 routers or switches between your MX and clients?  If so you might need to switch to Security Appliance>Addressing & VLANs, Track Clients by IP Address

[Caleb]

Thanks for the reply. We don't use the MX products. 

Our network setup is as follows client -> MR AP-> SG200-50 switch -> SonicWall Firewall ->IPS managed edge appliance 

[PhilipDAth]

I have seen this happen when someone plugs an iPhone via USB into a PC.  The PC NATs the iPhone, and both devices start appearing with the same MAC address.

[Caleb]

Interesting. In my instance these are both mobile devices. They both have been plugged into a PC at some point but the MAC address is not that of any PC it is that of one of the two mobile devices. 

iPhone A has the same MAC address in the dashboard as iPhone B. The MAC address is right for one of the devices and wrong for the other. 

[PhilipDAth]

Any chance a backup of one phone was restored onto another (so two different devices have appeared with the same  name)?

[Caleb]

iPhone A and iPhone B <-iPhone A was recycled so it has been registered once with the AP under a different user. But iPhone A and iPhone B have never been backed up and/or restored to each other. 

iPhone C and Samsung A <- not possible as these are different OS systems.