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IP Address conflict
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Jedi Master
Picture of Chuck Reti
posted
On occasion, a popup notification appears on my MPPro screen saying:
"Another device on the network is using your computer’s IP Address (10.0.1.x).

Try connecting again later. If you continue to have problems, change the IP address of this computer or the IP address of the other device. Contact the network administrator of you need more information."

Checking Network prefs, Wireless diagnostic and AirPort Extreme clients list, I find no other wireless device (don't have very many on the network) with the same IP as the computer in question. I do have one wired ethernet wired device on the router but with a non-conflicting IP address.
Curious why this has begun happening (since Sierra update) and how to avoid it. I have done resets/restarts on the Airport Extreme to see if this was some DHCP thing, but no change.

IP notification
 
Posts: 1098 | Location: Detroit | Registered: June 11, 2002Reply With QuoteReport This Post
iBBS Addict
Picture of James R. Cutler
posted Hide Post
Chuck,

  • The conflicting device does not have to be wireless. Both the WiFi and Ethernet LAN connections share the same IP address space.
  • Use Fing on your iPhone/iPad or LanScan on macOS to scan the LAN for all connected devices.
  • Confirm that the basestation > Network > DHCP Range is set properly to exclude static IP assignments.


Side Note: I use DHCP reservations on the same page so that I can leave all client devices set for DHCP. This is especially nice for printers, TV receivers, and network probes like the RIPE Atlas device.

basestation Network page
 
Posts: 1968 | Registered: January 02, 2003Reply With QuoteReport This Post
Jedi Master
Picture of Chuck Reti
posted Hide Post
aha. Think I found the conflict.
I have a VOIP comm app (Echolink ham radio) set up to use ports 5198-99 and had its "private IP address" set same as host system. changed it to an address outside DHCP range. Thanks for the investigative lead.
 
Posts: 1098 | Location: Detroit | Registered: June 11, 2002Reply With QuoteReport This Post
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