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  1. #1
    Chief911's Avatar Chief911 is offline 9/11 was an inside job!

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    Question Another device on my network using same IP address???

    Hi Guys,

    i am a little worried about an issue i am having with my wireless network at the moment. I got home last week and my brother said he got an odd message on my computer about other people using the network. Without seeing the message as he didn't take a screenshot i changed the network password and re-named the network. I just got home having left me computer on and now the message shows up and i can see it.




    Screen shot1111 | Flickr - Photo Sharing!


    I am a little worried, not knowing a lot about wireless internet. Any help much appreciated.



    EDIT: photo not showing.
    Last edited by Chief911; 24th May 2011 at 01:35 PM.
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  2. #2
    Geoff3DMN's Avatar Geoff3DMN is offline Motorbikes - lazy mans Zen

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    That doesn't normally mean other people are using your network, it normally means that 2 devices (computers, iphones, Apple TV's, XBox's, PS3's etc etc) have been given the same IP address on your network.

    You need to check your router for the devices accessing your network (normally using their network description and/or MAC address and IP address) and create a list of what IP addresses they are using to find out which 2 devices have conflicting addresses.

    I was surprised to find when I did this that I had a record of some 18 devices that were using or had used recently my home network (all these phones and ipads and apple TV's and and and...)

    I ended up creating fixed IP addresses for the devices using my home LAN most of the time and assigned a DHCP server range of addresses outside that range for occasional visitors and phones etc.
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  3. #3

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    Are all your devices up to date? The early iPad OS's had a bug which resulted in them using an IP address beyond it's allocated lease time. Maybe one of your devices is in need of a similar update.

  4. #4

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    I'm pretty sure that reading somewhere on this forum it was stated that if your system auto issues IP address to devices there can be occasional times a conflict occurs after a device "wakes up"
    Last edited by ednap; 5th June 2011 at 06:23 PM.

  5. #5
    nibbles's Avatar nibbles is offline Holding the fort

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    Yeah, I had this issue occasionally and it's nothing serious. I have static IPs for the desktops and then static IPs for the laptops but with different locations setup for when they are out of the house.

  6. #6
    Geoff3DMN's Avatar Geoff3DMN is offline Motorbikes - lazy mans Zen

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    Quote Originally Posted by ednap View Post
    I'm pretty sure than reading somewhere on this forum it was stated that if your system auto issues IP address to devices there can be occasional times a conflict occurs after a device "wakes up"
    This is one of the major causes of this issue and it's painfully annoying when it happens. That's why it's important to 'map' your LAN and match IP addresses to MAC address so as to minimize the number of times it does.
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  7. #7

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    Can someone please advise where I find a list of the IP addresses and how I change these for a device.

    Thanks heaps.

  8. #8

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    Quote Originally Posted by Mac Monk View Post
    Can someone please advise where I find a list of the IP addresses and how I change these for a device.
    You shouldn't need to the change them if your DHCP server and it's clients are configured and working correctly.

    Getting a list of IP addresses will depend on the DHCP server. For most people, it's the one built-in to their router so if that's the case for you, post-back with what you're using. Similarly changing the IP will depend on the client and also on what you mean by changing - do you want to assign static addresses at the DHCP server or give the client a static address from outside the DHCP pool?

  9. #9
    Currawong's Avatar Currawong is offline Knowing beats guessing

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    I had this problem occasionally. What I have on my network is a router, with address something like: 192.168.1.1. It uses DHCP to distribute address from 192.168.1.2 onwards. I changed this to having it distribute address from 192.168.1.100 onwards, then manually set up my computers to use addresses from 192.168.1.2 to 192.168.1.10 or so (ethernet and wireless get separate addresses). With a list of the IP addresses of each computer handy, it makes it trivially easy to troubleshoot a computer's connection using the Terminal or Network Utility.

  10. #10
    iTy
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    Quote Originally Posted by Currawong View Post
    I had this problem occasionally. What I have on my network is a router, with address something like: 192.168.1.1. It uses DHCP to distribute address from 192.168.1.2 onwards. I changed this to having it distribute address from 192.168.1.100 onwards, then manually set up my computers to use addresses from 192.168.1.2 to 192.168.1.10 or so (ethernet and wireless get separate addresses).
    Might be a silly question but how do you do that with an Airport/Telstra Modem Router combo?

  11. #11
    Currawong's Avatar Currawong is offline Knowing beats guessing

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    If the Airport is set to create its own network, in the Airport Utility (Manual Setup) under Internet -> DHCP you can set up which addresses it distributes from. For setting up the Macs, you could simply take a snapshot of the network settings for each Mac and duplicate them manually on the machine.

    A much simpler idea, however, is, if your Airport is distributing addresses, is to set the DHCP lease to 365 days or however long so your issue doesn't occur again.

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