IP address conflict with other PC's

Discussion in 'MacBook Pro' started by davo03, May 3, 2010.

  1. davo03 macrumors newbie

    Joined:
    May 3, 2010
    #1
    hi guys,

    so i bought the new macbook pro 13inch in america and brought it back with me to australia. now im haviong a bit of trouble with the internet.
    i have a wireless router with 3 other pc (2 desktops, 1 laptop) and a PS3 allready assigned to it. never had a problems allways worked well. now i configured my macbook to join this network and it works and all but eventually cuts out and has been causing IP conflicts with the other systems aswell on that wireless router. it seems they are all running on DHCP so dont realy see why there should be a problem but there is. ive tryed manually setting IP address to the Macbook but that didnt work either.
    im no genious with all this so dont realy have much of a clue whats going on so any ideas how i can get all of the machines running smoothly when they are all connected with out ip conflicts and cutting out. I shoudl mention my wireless network is hidden and has a passcode and sometimes my mac forgets it because it has cut out. so any suggestions and help would be great

    cheers

    also sorry about bad spelling. cant be bothered changing it
     
  2. Tex-Twil macrumors 68020

    Tex-Twil

    Joined:
    May 28, 2008
    Location:
    Europe
    #2
    hi,
    as you mentioned, if it's using DHCP there shouldn't be IP conflicts. What makes you think that the problem comes from an IP conflict ?
     
  3. acurafan macrumors 6502a

    Joined:
    Sep 16, 2008
    #3
    try these: 1) on the wireless AP, check settings and see if your AP has conflict detection (it will ping an ip address prior to giving it out) and enable it;

    2) on your mac, go to network and set up another location profile with a static ip address outside of the ip scope (the ip range your AP is providing to your computers). put in manual settings, i.e.: ip addr, subnet mask, gateway, dns...see if those help.
     
  4. davo03 thread starter macrumors newbie

    Joined:
    May 3, 2010
    #4
    well when the pc's crash aswell they say there has been an IP address conflict
     
  5. Tex-Twil macrumors 68020

    Tex-Twil

    Joined:
    May 28, 2008
    Location:
    Europe
    #5
    ok, could you check what are the IPs of all your devices ?

    In osx, it's in the Preferences/Network/AirPort/Advanced/TCP IP

    In Windows XP, right click on your connection in the status bar and Properties I believe.
     
  6. MikhailT macrumors 601

    Joined:
    Nov 12, 2007
    #6
    DHCP doesn't automatically mean the IP conflicts are avoided. One of the common issues is that the router can be configured to reserve an IP address for certain machines and sometime laptops dropping in and out can hold on to the IP lease far too long without releasing it and renewing it.

    You should go to the router's DHCP config page and make sure no computers have reservation that conflict with other reservations. Some router do not do validation. Make sure your router is up to date as well.

    In order to help us help you, we need more information. You can take pics of the DHCP page in your router, copy the logs from the router, write down all the ip addresses on (you can probably get this from DHCP client list somewhere on your router), the model and brand of the router as well as firmware version for starters.
     
  7. bigjobby macrumors 65816

    Joined:
    Apr 7, 2010
    Location:
    London, UK
    #7
    also to add, if you have a unit with a static IP address on the network and which is not on the reserve list, the router may not have picked this up and the DHCP might have issued an IP without knowing its already being used.

    As already suggested, check your IP configurations on all devices including logs.
     

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