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OS X - Operating System General OS operation information and support

Error - "Another device...is using your computer's IP address."


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AUZambo

 
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I just installed Snow Leopard (upgraded from Tiger) last Saturday and today I ran into the error below. Anyone have any idea what this means and how I can remedy it? I have no idea what the other device might be.

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Slydude

 
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This usually happens when two devices on the same network have been assigned the same IP number. Do you have a router on your network? If so, I suspect that one computer/device has been set up with a pre-assigned ID number that the router is trying to assign to something else.

If you can give us a bit more information about your setup I am sure we can get this resolved.

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AUZambo

 
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I have a cable modem from Brighthouse Networks and a linksys router. Our DirectTV receiver is hardwired to the router. Things in our house that feed off the wifi: nintendo wii, two iPhones, and this Macbook Pro. At the time the error message came up the computer was the only thing feeding off the wifi.

Is that enough info?
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mayflyTR

 
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are both the cable modem and linksys router wireless?
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AUZambo

 
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Quote:
Originally Posted by mayflyTR View Post
are both the cable modem and linksys router wireless?
The modem is hardwired to the coax cable coming out of the wall, then an ethernet cable sends the internet signal from the modem to the router. The router then broadcasts the internet signal wirelessly to the Wii, Macbook Pro, and iPhones.
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Are any of the devices set to have static addresses (manually set) or does everything get its IP address automatically from the router (dynamic)?

Also, is this a problem that just started? If so, has any new gear been added or settings changed recently?

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AUZambo

 
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Quote:
Originally Posted by Slydude View Post
Are any of the devices set to have static addresses (manually set) or does everything get its IP address automatically from the router (dynamic)?

Also, is this a problem that just started? If so, has any new gear been added or settings changed recently?
I have never adjusted an IP address in my life, so I'm assuming everything gets its IP address from the router.

It's only happened once (when I made the original post), and everything has worked fine since then. Maybe it was just a one time thing. I'll update y'all if it happens again.
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ericweiner

 
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I am seeing this issue here at work as well. Only, I am using static IP's. It looks like the machine is seeing itself as another host on the network with the same IP. I have tried renaming the machine under system preferences -->network but under the WINS tab, another name is in use. I try to match this name and it changes itself.

Any help on this would be appreciated. I have many Macs here on the network that are not showing this issue.

~Eric
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For the OP (AUZambo), is the network secure and only your devices have access? If not, an outsider may be utilizing your network without your knowledge.

ericweiner, it sounds like that machine is set to act as a wireless router by itself. Make sure it's not.


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AUZambo

 
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Quote:
Originally Posted by baggss View Post
For the OP (AUZambo), is the network secure and only your devices have access? If not, an outsider may be utilizing your network without your knowledge.

ericweiner, it sounds like that machine is set to act as a wireless router by itself. Make sure it's not.
Mine is secured. Only devices in my house should access the wifi, unless a neighbor has stolen my password.

The error still hasn't resurfaced, so I'm not too worried about it right now.
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ericweiner

 
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I'm still seeing this here on my network. It doesn't happen with any of the Leopard machines, only Snow Leopard so it has something to do with the dns resonder changes that were made in the Snow Leopard upgrade. Wireless is not enabled on these machines. (One is a Mac Pro and one is an iMac) I've tried:
-Clearing DNS cache
-Changing hostname
-Restarting the dns responder
-Setting the ethernet to DHCP
-Using a static IP address and hard coding the DNS servers
-Manually creating the DNS (A) record and reverse lookup record (ptr)

I'm all out of ideas....
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