Networking - same IP address on 2 computers

Somehow my 2 macs have the same IP address and so I cannot access internet from both at the same time (via Airport wireless) - how can I reset one of the computers to get rid of the IP address and start over with an automatically assigned IP? I have tried deleting Airport from Networking (System Preferences) and resetting it but with no success.

Hi lemeliac, and a warm welcome to the forums!
One or more of them must be set to Static IP, or the Router isn't set to hand out IPs.
In System Preferences>Network>Show:>Airport>TCP/IP tab, make sure that IPv4: is set to Using DHCP.

Similar Messages

Same ip address on 2 computers

Hi folks, I am trying to network my G4 powerbook and my G5 powermac. I want to use Desktop transporter to remote control my G5 for recording. I have an ethernet cable linking both. I can see and control the laptop from the G5 but not the other way around . It keeps telling me both computers have the same ip address . How do i sort this . Treat me as knowing absolutely nothing. Thanks John

On both Macs:
1: Click blue Apple -> Location -> Network Preferences
2: Location should be Automatic
3: click Show: Built-in Ethernet
4: Under TCP/IP, Configure IPv4 should be Using DHCP
5: if you made any changes, click Apply Now
6: IP Address should be different on each (if the two are directly connected with no router, they should be 169.254.xxx.xxx)
7: If both are set to Automatic DHCP and both still have the same IP, change one of them to Configure IPv4: Using DHCP with manual address, then change ONLY the last (rightmost) digit of the address to something else.
8: come back here and give me some points
AlBook 15

SAme ip address on 2 computers: how to change 1

Maybe it is because I used setup assistant or whatever that's called. Anyway, they sometimes conflict. How can I change one?
Thanks

You mean other than System Preferences -> Network -> (interface)?

How to fix the "Two computers using the same IP address" issue on the airport express

I just bought an airport express and got dsl at my apartment, and I haven't been able to set up the wireless connection. My DSL works just fine but whenever I hook up the AX I get an error message saying that there are two computers using the same IP address on the network, but I only have one computer.
I know this is probably a simple fix, but I've never had this issue when I set up the Extreme at my parents house and I haven't been able to find a thread on this.
As of right now I have it set to Factory settings.
Help please!

This modem was designed to connect directly to a computer and you are trying to connect it to a router.
Unfortunately, this is not a simple fix as both the modem and your AirPort Express will need to be configured differently to work together correctly.
Connect the modem directly to your computer.
Open up your browser and type the default IP address for the modem into the address bar. Check your documentation on the modem but it is likely 192.168.1.254
That will bring up the configuration page for the modem.
You may need to enter the modem access code which is on a label on the back or bottom of the device
Look for an Advanced tab, then look for a tab labeled something like PPP Location
Right now, you will see that "PPP is on the modem"
Chance that to "PPP is on the computer or router"
Click to save your new settings and the modem will restart
If you ever need to get the modem back to its original settings, you will need to hold in the reset button on the back of the modem for 5-6 seconds and then enter in the default IP address to be able to access the settings on the modem
Connect the modem to the AirPort Express with an Ethernet cable
Open AirPort Utility on your Mac and click Continue to follow the guided setup to "Create a wireless network"
You may be asked to "switch" networks when you do this. You want to switch
Select the "Connect Using PPPoe" option when it appears
Enter your user name and password with your provider. Leave the Service Name area blank. You want to always stay connected if you see that option
Continue to follow the guided setup and Update to save settings
Pull the power cord from the modem, wait a moment, then restart the modem
Log on to the wireless network that you created during the setup and you should have an Internet connection

Same IP Address on 3 of 5 computer on network??

I am trying to log into my other computer via VNC but i am finding out 3 computer in my office (out of 5) and my one mac at home all have the same IP address??
so what do i do to log in when i type in the ip address i get "you cant share your own computer with yourself"
and why do 2 of my other macs in my office have different IP address when hooked up to the same network.
some of the computer are wirless and some are not all using an airport ex
any suggetions
thanks
brad

Two possibilities: 1. someone manually set the IP addresses and they are all the same, or 2. there's network address translation involved.
Your home computer has an IP address assigned by the local router out of a range of addresses reserved for the purpose. Something in the 192.168.0.0-192.168.255.255 range. Chances are pretty good that computers in a small office attached to a different router have similarly assigned addresses. Further, if multiple computers are connected to a router with network address translation enabled, all of the computers will appear to have a single IP (one assigned by whatever gateway assigned an IP address to that router).
The IP address 192.168.1.1 is probably the singularly most assigned IP address on the planet. I wouldn't be surprised if ten million or more machines are using it.
Of course, that doesn't solve you problem, but I can't really provide a solution without a little more information about your network topology (what's connected to what, and how).

I have a wireless network at home. I run my iphone and ipad on it with no problems. Just purchased a MacBook Pro, and now my wi-fi keeps disconnecting and i get an error message saying another device is using the same IP address. What does all this mean?

I have a wireless network at home. I run my iphone and ipad on it with no problems. Just purchased a MacBook Pro, and now my wi-fi keeps disconnecting and i get an error message saying another device is using the same IP address. What does all this mean?

Hello AKCamus
To give you some ideas of what to do next, I have provided a few articles that will give some troubleshooting Wi-Fi connections and recommended Wi-Fi settings.
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/HT4199
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/ts1398
Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
http://support.apple.com/kb/HT4628
Thanks for using Apple Support Communities.
Regards,
-Norm G.

My macbook wont allow me to use the same hotmail address as i used on my other computers. How can I keep the same email and log into it on a macbook?

my macbook wont allow me to use the same hotmail address as i used on my other computers. How can I keep the same email and log into it on a macbook?

That indicates a hardware failure. Read here:
http://support.apple.com/kb/ts1559
If nothing works, you most likely have a hardware failure. Make an appointment at an Apple store to confirm.

I have two Macbooks at home that are connected to a Comcast Wi-Fi network modem. One of the computers has sporadic in receiving the WI-FI signal while the other is unaffected. Both have same operating system. Does anyone know a solution to this problem?

I have two Macbooks that are connected to the same Comcast Wi-Fi network modem. One of the computers has become very sporadic in receiving the WI-FI signal while the other is unaffected. Both have same operating system (10.5.8). I have restarted computer, and unplugged and retarted modem on several occassions to no avail--one still works the other inconsistent. Have spent a great deal of phone time with Comcast and they suggest acquiring latest OS. Does anyone know a solution to this problem?

This does not sound to be a router problem...You should try to uninstall and re-install the ethernet adapter/card installed in your computer...Do you have 2 Ethernet Adapter's by any chance...Check the Device Manager, Click on the Start button >>> Settings >>> Control Panel >>> Double click System, go to Hardware >>> Device manager, click on the plus'+' sign next to Network Adapters and see how many Ethernet Adapters are listed...
Also connect that computer straight to your modem and see check if you get the same message,that 'YOU ARE CONNECTED TO MORE THAN ONE NETWORK'...

Can you log into CC on two computers on the same IP address at the same time?

Can you log into CC on two computers on the same IP address at the same time? Because i accidentally opened both and was wondering if it will affect my membership or deny me access to CC. Thanks

Cloud License allows 2 activations http://www.adobe.com/legal/licenses-terms.html
-Install on a 2nd computer http://forums.adobe.com/thread/1452292?tstart=0
-Windows or Mac does not matter... 2 on the same operating system, or 1 on each
-Both subscriptions MAY be in use at the same time https://forums.adobe.com/thread/1683787

Macbook Air has the same IP address as another device on my network

I recently connected airport extreme to my network, and now I cannot connect to the Intenet from my MacBook Air. The error message I get is that another device on the network is using the same IP address (192.168.1.64) I also have a mcbook pro, which is working fine, and whose IP address is 108.66.128.91, so I don't know which device has the duplicate IP address.
Furthemore, I can't connect to the new WiFi signal from my iPhone. What do I need to do to fix these errors?

I would recommend that you do the following as a minimum:
Power-down the modem, AirPort base station, and computer(s).
Power-up the modem; wait at least 10-15 minutes to allow it adequate time to initialize.
Power-up the AirPort base station; wait at least 5-10 minutes. Note: The AirPort's status light may continue to flash amber after it has intialized. That is because, there may be some additional configuration items necessary, like setting up wireless security, before the overall setup is completed to get a green status.
Power-up your computer(s).
If the above steps do not solve the problem, start over with step 1 above, but then perform the next steps between steps 1 & 2. above.
Disconnect the AirPort base station from the Internet broadband modem.
While all of the devices are powered-down, perform a "factory default" reset on the base station. This will get it back to its "out-of-the-box" configuration and make setting it up much easier, especially if you use the "Assist me" process within the AirPort Utility. (ref: Resetting an AirPort Base Station or Time Capsule)
After the base station resets, go ahead and power it back down.
Reconnect the AirPort base station to the Internet broadband modem. For the Extreme and Time Capsule, be sure to connect the cable to the base station's WAN (circle-of-dots) port.
Continue with step 2 in the first set of steps.
In this basic configuration, the AirPort base station will broadcast an unsecured wireless network with a Network Name (SSID) of Apple Network NNNNNN. Network clients, connected to the base station either by wire or wireless, should now be able to access the Internet through the ISP's modem. Once Internet connectivity has been verified, you can use the AirPort Utility to configure the base station for wireless security and any other desired options. Please post back your results.

Another device on the network is using the same IP address

While this question has been asked within the community, I cannot find an answer that solves my problem. This happened about a year ago and was thought to be a modem/router issue. I switched to Airport and all had been fine until a few weeks ago. Now I periodically can't get online from my laptops.
Settings for my macbook at System Preferences ▹ Network ▹ Advanced ▹ TCP/IP are:
Configure IPv4: Using DHCP
IPv4 Address: 192.168.1.84
Subnet Mask: 255.255.255.0
Router: 192.168.1.254
Configure IPv6: Off
We did recently get a new ipad and new wireless printer so one of them may be the issue
Any help would be appreciated.
Thanks!

If you are having IP addresses assigned using DHCP and one of the devices is disconnected from the network for a long enough period of time then the router will make that IP address available to another device to use. If the first device then comes back on the network with the same IP address it had before then you'll get the dual IP address situation. This usually doesn't happen since the returning device is SUPPOSED to ask for a new IP address when it re-joins the network. In your case this may not be happening.
What I do is use static IP addresses for all the devices on my home network. In your case I think this will fix your problem.
Set up your Airport to 'reserve' specific IP addresses for the devices in your local network via their MAC addresses.
Open the airport utility, select your router, click EDIT, select NETWORK.
In the area marked DHCP Reservations: click on the + sign
Type a description of the device.
Use the pull-down menu to select "Reserve Address By: MAC address"
enter the MAC address in the appropriate line.
enter in the unique IP address for each device that you want to reserve. Make sure its in the same subnet (ie. 192.168.xx.yy)
click SAVE
Repeat the above for all your devices.
Update your airport settings.
When you're done turn off all the wireless devices for 5 minutes and then reconnect. Each should then reconnect with the same IP address each time. You can still leave the devices themselves set to use DHCP so that when you take them outsider your network, they'll request an IP address from the new network.
I hope this made sense. If not, post back and I'll calrify anything you need.

Multiple sites, different computers, same ip addresses.

I'm at a site today where some client machines have identical IP addresses to client machines at another site (192.168.1.xxx). This is resulting in some kind of weird thing where when I try to interact with client machines, ARD tries to go back to the other machines with the same IP addresses.
So if, for instance, I try to install a package on a machine at site B, when the confirmation dialog window pops up, the computer with that same IP address at site A is listed. Trying to go ahead with the installation (or whatever) fails because, well, the computer at site A is not available.
Does this make sense? I'm typing in an awful hurry in hopes that someone can see this soon!

Yes, forgive me for not being clear... I was in a terrible hurry. I wound up just deleting all the computer records from ARD so there would be no conflicts.
TeenTitan wrote:
If your at location B, and your trying to access computers at location B, but your computer records from location A is in the way. Have you considered creating a new user account on your ARD computer for location b computers.
Yes.
The problem I was having is that I have two different sites with multiple computers, call them sites A and B. At site A, there are computers whose IP addresses are within the range of 192.168.1.100-150. At site B, there are many computers witin the same IP range. Where machines had conflicts at site B, they would be replaced with the names of computers from site A. Is this making sense?
So when I'd try to log in to a machine at site B whose IP address ended in 105, if there a computer at site A that ended in 105, ARD would look only for the machine at site A.
I did think of making a new user on the laptop, but UGH! That would be a pain!
Is it possible to have ARD only look at the MAC address of the computers or something? It seems pretty stupid that all it looks at is the IP address. It's possible that I could get the machines at site B moved to a different range, but I'm not sure how easy that would be. And I'd rather think there's an easier way to use this software.

Same IP addresses on AirPort Network

A few weeks ago, we changed our office's WiFi network by installing an AirPort Extreme base station and two AirPort Express stations that extend the WiFi network.
I've configured the nwetwork so that our entire fleet of computers have fixed IP addresses (using DHCP reservations) for Ethernet and WiFi access. Furthermore, I've enabled Timed Access Control for anyone not having a fixed IP address so that the network is unavailable between 6:30 PM and 7:30 PM on weekdays and none at all during weekends (we've tried Guest Networking, but it wasn't a workable solution in the end for us and we dropped it).
Everything worked fine for a while until some of us began receiving the following address:
“Another device on the network is using your computer's IP address (X.X.X.X).”
It seems to happen at random, although I noticed it happens often when we use AirDrop (which requires a WiFi connection). That seems to have no noticeable effect on the network usage (albeit maybe some difficulties using AirDrop between users), but the simple fact of receiving this alert is a bit annoying… and not so reassuring.
Considering the fact that I've made DHCP reservations on the AirPort network, that I've checked that computers have the IP addresses they have been allocated, and that I've checked every MAC address to make sure there's no mistake, what is causing this odd behaviour from our network?
Should I setup manual IP addresses on every computer and device in the office (from the Network's System Preferences' pane)?
Thanks for your input and solutions!

I had that similar issue in the past but it wasn't with an Airport extreme but with a soho cisco wireless router. The only thing is that I didn't have a timed access on anything. Every now and then I couldn't access a computer and when I looked into the router I noticed that one of the computers would be offline and it would have the IP conflict message. I would check logs and noticed that a wireless device or any newly connected device would end up booting one off. I thought it was rather strange myself. But I did want to segment the devices that were accessing the network via wirelessly and via ethernet so I can distinquish between and I also had an ACL so I can remotely access to the ethernet devices. So I set up a scope with the range being .15 -.30 for ethernet devices and I actually statically set these up on the computers as well. And I set another range .45 - .80 for all Wi-Fi devices and it has been working correctly ever since then.

WRT54GS: without Windows, force a given MAC address to always get the same IP address via DHCP?

I have just now set up my WRT54GS to manage my home wireless network, and it works great. I just have one question that I haven't been able to find an answer for (forgive me if I have overlooked an obvious source of information).
I have set up the WRT54GS to be a DHCP server, and it assigns addresses in an ad hoc manner to all the devices that connect to it. In general, this is what I want, but in one case, I want a certain host to always get the same IP address, for example, 192.168.1.10.
You should know that I have no Windows machines on my network. Everything is either running Linux, MacOSX, or Symbian (on a Nokia N95 handheld). Therefore, I can't set up a static IP for my device using the software supplied on the CD that comes with my router, as that software only runs under Windows.
Using a different manufacturer's router, I am able to accomplish this by telling the DHCP software on that router to always assign 192.168.1.10 to the host who connects with a certain MAC address. I can then use this mechanism to force my specific host to always get this desired IP address. However, I haven't been able to find any way to do that with the WRT54GS without the software on the Windows-based CD. Is it possible at all? If I can indeed do this without that Windows software, could someone point me to some docs which explain how to accomplish this?
... or is there perhaps a different way to cause this to happen, perhaps by means of some sort of DHCP client ID?
Thank you very much in advance for any pointers you can give me.
Message Edited by HippoMan on 10-16-2007 05:27 PM
Take a hippopotamus to lunch today.

Forget about the CD. There is nothing on the CD which you don't configure better through the router web interface at http://192.168.1.1/ You don't need the CD. Never. I have never used the CD to configure any of my routers. The program on the CD is just a software which helps you with the initial configuration of the router. It is just a software which pretty much contacts the web interface in the background and sends some settings changes there. You can do everything yourself directly. Then you know what you change.
You have to configure the static IP address on the computer and on the computer only, e.g. on your Mac use Static IP instead of DHCP in the network preferences. Enter the IP address you want to use for the computer, the subnet mask, gateway address and DNS server(s). That's it. The router is not involved in any of this.
You just have to make sure that you use an IP address inside the LAN of the router. By default, Linksys routers use the IP address 192.168.1.1 on the LAN side for the the router. The subnet mask is 255.255.255.0. The IP address together with the subnet mask says that all IP addresses 192.168.1.0-255 are considered part of the LAN. Everything else is outside and needs to be routed to the router and from there into the internet. (If you want to know how the subnet mask works exactly read the wikipedia article on it or search for "subnet calculator" or similar in the internet)
Thus, if you connect a computer to your LAN and set a static IP address on the computer it should be inside this IP address subnet/range in order to have internet and LAN access on the computer. It does not matter which address you use as long as it is inside the IP subnet. The DHCP server on the router automatically assign a correct IP address inside the IP subnet and also automatically assigns the correct gateway address (its own address = the address to which everything should be sent which does not belong into the LAN, i.e. the internet traffic) and the DNS server. With static IP you have to assign those values yourself.
But again, there is no Windows computer or CD involved to do that nor is there any configuration on the router required to set the static IP address on the Mac. The IP address you set must simply match your LAN IP which is basically defined through the settings on the router as you want to have internet and thus need access to the router and its address 192.168.1.1.
Some routers allow you define fixed IP addresses for specific devices in the DHCP server of the router. With that function you can set a fixed IP address on the router. The computer can remain on DHCP. It will always get the IP address you have configured in the list on the router through the DHCP server. However, your Linksys router does not have this option. If any device inside your LAN is supposed to receive the same IP address at any time you have to configure that on the device only.
If you have not changed the default LAN IP address, subnet mask and DHCP server settings on the router, the router has 192.168.1.1, subnet mask 255.255.255.0 and the DHCP server uses 192.168.1.100-149 for dynamic assignments. To avoid potential address conflicts you should not use any static IP addresses inside the DHCP server address pool. This leaves you with IP addresses 192.168.1.2-99 and 150-254 as static IP addresses inside your LAN. You can pick any address you like as long as any device with a static IP address has a unique IP address inside your LAN.
Assign the subnet mask 255.255.255.0 on the computer and set the default gateway to 192.168.1.1. The DNS servers are a little bit more complicated. Generally it is better and faster if you use the DNS servers of your ISP. You can, however, also use the IP address of the router 192.168.1.1 as DNS server. The router will then operate as DNS proxy, i.e. it contacts the DNS servers of your ISP for any request from your computer.
If you want to use the DNS servers of your ISP, click on the Status tab in the router web interface. It shows you the current settings of the router on the internet port. It should show you multiple entries for DNS servers. Choose those DNS server IP addresses in the computer.
If you don't want to go through the hassle with the direct access to the DNS servers of your ISP, simple use 192.168.1.1 as only DNS server on the computer.
There are all settings you have to make on your Mac or other computers to assign a static IP address. As long as the IP address is inside 192.168.1.* it belongs to the LAN and has internet access through the router (as long as the default gateway address is 192.168.1.1 of course).
Firmware is loaded either through the web interface of the router, usually somewhere on the Administration tab or with tftp. Both ways work fine on any Mac or Linux box.

Uverse - Airport Extreme and MacBook Pro assigned same IP address

Ok, so I have a Uverse RG -> Airport Extreme -> bunch of computers. For some reason, everytime my MacBook Pro sleeps and then I wake it up, it says it can't connect to the internet because there is another device with the same IP address. None of my other Macs (iMac, Powerbook, iPad, iPhones) ever exhibit this behavior. I'm not sure what's going on here. It's almost like the AE takes on the IP address of the MacBook Pro every time it sleeps (or maybe its the other way around). If I go to advanced settings on my MBP and try and renew the DHCP lease, it won't renew and continues to give me the same error message. If I log on to the AE and renew the DHCP lease, it comes back just perfect. This has to be an issue with my RG since it's assigning the IP addresses right? I tried manually setting the IP address of my AE. That seemed to fix it for awhile, but then the MBP again started reporting the same IP address as another device on the network. I didn't discover which device it was, but I did determine it was not the AE since it was configured with a manual IP address. This is getting pretty frustrating as I have to log on to the AE and reset the DHCP lease every time I leave and come back to my MBP. Anyone have any ideas what could be causing this?

I had the same problem with an Airport-enabled iMac.
Here's what I did that fixed the problem:
Log into the Uverse Admin Tool through your browser.
Click on the Settings tab.
Click on the LAN link in the grey bar
Click the circle in front of "Configure Manually"
Set the "Router Address" to 192.168.1.254
Set "Subnet Mask" to 255.255.255.0
Set "First DHCP Address" to 192.168.1.100
Set "Last DHCP Address" to 192.168.1.199
Click the "Save" button. (You'll probably have to enter your password.)
Now open the Airport Utility.
Choose your Airport Express on the left and click the "Manual Setup" button.
Click the "Internet" icon in the top bar.
Click on "TCP/IP"
Select "Manually"
Set "IP Address" to 192.168.1.42
Set "Subnet Mask" to 255.255.255.0
Set "Router Address" to "192.168.1.254"
Set "DNS Server" to "192.168.1.254"
Click the "Update" button.
This sets your Uverse router, which is handing out the IPs, to only give IPs out that number between 100 and 199. It reserves the rest for you to enter manually. So your laptop, your iPhone, etc, will get the DHCP addresses between 100 and 199 but your Airport Express will *always* have 42.
You may have to reboot everything to make sure each device gets the new IPs.
Also, there is no significance to the 42 number. It can be anything between 1 and 99.

Networking - same IP address on 2 computers

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