IP address in conflict..?

Discussion in 'Microsoft Windows 2000 Networking' started by Kent J, Dec 14, 2008.

  1. Kent J

    Kent J Guest

    Hi all,

    I have a wireless network with a ADSL modem/router and a wireless DLink
    'Range Extender'.

    When I run this I get: 'Windows - System Error. There is an IP-adressin
    conflict with another system on the network'.
    What does this mean? How can I fix it?

    Kent J.
     
    Kent J, Dec 14, 2008
    #1
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  2. It means what it says - the IP address your computer is trying to use is
    already assigned to another device on the network. Find the offending
    device by checking the IP address of all devices on the network, then change
    the address of one or the other devices - your PC or the other device on the
    network with the same IP address, whichever would be easiest.

    --
    Richard G. Harper [MVP Desktop]
    * NEW! Catch my blog ... http://msmvps.com/blogs/rgharper/
    * PLEASE post all messages and replies in the newsgroups
    * The Website - http://rgharper.mvps.org/


    "Kent J" <> wrote in message
    news:pVf1l.4797$...
    > Hi all,
    >
    > I have a wireless network with a ADSL modem/router and a wireless DLink
    > 'Range Extender'.
    >
    > When I run this I get: 'Windows - System Error. There is an IP-adressin
    > conflict with another system on the network'.
    > What does this mean? How can I fix it?
    >
    > Kent J.
     
    Richard G. Harper [MVP], Dec 14, 2008
    #2
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  3. Kent J

    Kent J Guest

    OK!
    I have a router with DHCP that provides PC:s running with a dynamic
    IP-address and also a Dlink RangeExtender, with a static
    IP-address,working as a slave.

    If I check attached devices from my router I'll get:

    # IP Address Device Name MAC Address
    1 192.168.0.5 MYCOMPUTER 00:21:91:DA:78:51
    2 192.168.0.31 DLINK 00:21:91:DA:78:51

    Different IP-address but the same MAC Address.
    Is that a problem?

    Kent J.


    Richard G. Harper [MVP] skrev:
    > It means what it says - the IP address your computer is trying to use is
    > already assigned to another device on the network. Find the offending
    > device by checking the IP address of all devices on the network, then
    > change the address of one or the other devices - your PC or the other
    > device on the network with the same IP address, whichever would be easiest.
    >
     
    Kent J, Dec 16, 2008
    #3
  4. Kent J

    Joel Guzman Guest

    Yes its a problem


    On 12/16/08 5:19 PM, in article sPV1l.4890$, "Kent
    J" <> wrote:

    > OK!
    > I have a router with DHCP that provides PC:s running with a dynamic
    > IP-address and also a Dlink RangeExtender, with a static
    > IP-address,working as a slave.
    >
    > If I check attached devices from my router I'll get:
    >
    > # IP Address Device Name MAC Address
    > 1 192.168.0.5 MYCOMPUTER 00:21:91:DA:78:51
    > 2 192.168.0.31 DLINK 00:21:91:DA:78:51
    >
    > Different IP-address but the same MAC Address.
    > Is that a problem?
    >
    > Kent J.
    >
    >
    > Richard G. Harper [MVP] skrev:
    >> It means what it says - the IP address your computer is trying to use is
    >> already assigned to another device on the network. Find the offending
    >> device by checking the IP address of all devices on the network, then
    >> change the address of one or the other devices - your PC or the other
    >> device on the network with the same IP address, whichever would be easiest.
    >>
     
    Joel Guzman, Dec 17, 2008
    #4
  5. Kent J

    Kent J Guest

    What is a MAC-address anyway?
    How can the address be the same?

    Kent J.



    Joel Guzman skrev:
    > Yes its a problem
    >
    >
    > On 12/16/08 5:19 PM, in article sPV1l.4890$, "Kent
    > J" <> wrote:
    >
    >> OK!
    >> I have a router with DHCP that provides PC:s running with a dynamic
    >> IP-address and also a Dlink RangeExtender, with a static
    >> IP-address,working as a slave.
    >>
    >> If I check attached devices from my router I'll get:
    >>
    >> # IP Address Device Name MAC Address
    >> 1 192.168.0.5 MYCOMPUTER 00:21:91:DA:78:51
    >> 2 192.168.0.31 DLINK 00:21:91:DA:78:51
    >>
    >> Different IP-address but the same MAC Address.
    >> Is that a problem?
    >>
    >> Kent J.
    >>
    >>
    >> Richard G. Harper [MVP] skrev:
    >>> It means what it says - the IP address your computer is trying to use is
    >>> already assigned to another device on the network. Find the offending
    >>> device by checking the IP address of all devices on the network, then
    >>> change the address of one or the other devices - your PC or the other
    >>> device on the network with the same IP address, whichever would be easiest.
    >>>

    >
     
    Kent J, Dec 17, 2008
    #5
  6. Kent J

    Bob I Guest

    See
    http://www.google.com/search?hl=en&q=MAC+address&aq=f&oq=
    and
    http://www.google.com/search?hl=en&q=MAC+address+spoofing

    Kent J wrote:
    > What is a MAC-address anyway?
    > How can the address be the same?
    >
    > Kent J.
    >
    >
    >
    > Joel Guzman skrev:
    >
    >> Yes its a problem
    >>
    >>
    >> On 12/16/08 5:19 PM, in article sPV1l.4890$,
    >> "Kent
    >> J" <> wrote:
    >>
    >>> OK!
    >>> I have a router with DHCP that provides PC:s running with a dynamic
    >>> IP-address and also a Dlink RangeExtender, with a static
    >>> IP-address,working as a slave.
    >>>
    >>> If I check attached devices from my router I'll get:
    >>>
    >>> # IP Address Device Name MAC Address
    >>> 1 192.168.0.5 MYCOMPUTER 00:21:91:DA:78:51
    >>> 2 192.168.0.31 DLINK 00:21:91:DA:78:51
    >>>
    >>> Different IP-address but the same MAC Address.
    >>> Is that a problem?
    >>>
    >>> Kent J.
    >>>
    >>>
    >>> Richard G. Harper [MVP] skrev:
    >>>
    >>>> It means what it says - the IP address your computer is trying to
    >>>> use is
    >>>> already assigned to another device on the network. Find the offending
    >>>> device by checking the IP address of all devices on the network, then
    >>>> change the address of one or the other devices - your PC or the other
    >>>> device on the network with the same IP address, whichever would be
    >>>> easiest.
    >>>>

    >>
     
    Bob I, Dec 17, 2008
    #6
  7. Kent J

    Kent J Guest

    I'm afraid I still dont' get it.
    I have three different MAC addresses that relates to MYCOMPUTER

    1.) From ipconfig /all:
    Physical address: 00-19-5b-eb-34-52

    2.) From 'Configure' on the network card:
    Local Administartion MAC Network Address: 00DEADBEEFCAFE

    3.) From the router 'Attached Devices':
    # IP Address Device Name MAC Address
    1 192.168.0.4 MYCOMUTER 00:21:91:DA:78:51
    2 192.168.0.31 RANGE EXTEND 00:21:91:DA:78:51

    Should't it be just one MAC address per device?

    Kent J.





    Bob I skrev:
    > See
    > http://www.google.com/search?hl=en&q=MAC+address&aq=f&oq=
    > and
    > http://www.google.com/search?hl=en&q=MAC+address+spoofing
    >
    > Kent J wrote:
    >> What is a MAC-address anyway?
    >> How can the address be the same?
    >>
    >> Kent J.
    >>
    >>
    >>
    >> Joel Guzman skrev:
    >>
    >>> Yes its a problem
    >>>
    >>>
    >>> On 12/16/08 5:19 PM, in article sPV1l.4890$,
    >>> "Kent
    >>> J" <> wrote:
    >>>
    >>>> OK!
    >>>> I have a router with DHCP that provides PC:s running with a dynamic
    >>>> IP-address and also a Dlink RangeExtender, with a static
    >>>> IP-address,working as a slave.
    >>>>
    >>>> If I check attached devices from my router I'll get:
    >>>>
    >>>> # IP Address Device Name MAC Address
    >>>> 1 192.168.0.5 MYCOMPUTER 00:21:91:DA:78:51
    >>>> 2 192.168.0.31 DLINK 00:21:91:DA:78:51
    >>>>
    >>>> Different IP-address but the same MAC Address.
    >>>> Is that a problem?
    >>>>
    >>>> Kent J.
    >>>>
    >>>>
    >>>> Richard G. Harper [MVP] skrev:
    >>>>
    >>>>> It means what it says - the IP address your computer is trying to
    >>>>> use is
    >>>>> already assigned to another device on the network. Find the offending
    >>>>> device by checking the IP address of all devices on the network, then
    >>>>> change the address of one or the other devices - your PC or the other
    >>>>> device on the network with the same IP address, whichever would be
    >>>>> easiest.
    >>>>>
    >>>

    >
     
    Kent J, Dec 19, 2008
    #7
  8. Kent J

    Tim Jackson Guest

    "Kent J" <> wrote in message
    news:8UQ2l.4941$...
    > I'm afraid I still dont' get it.
    > I have three different MAC addresses that relates to MYCOMPUTER
    >
    > 1.) From ipconfig /all:
    > Physical address: 00-19-5b-eb-34-52
    >
    > 2.) From 'Configure' on the network card:
    > Local Administartion MAC Network Address: 00DEADBEEFCAFE
    >
    > 3.) From the router 'Attached Devices':
    > # IP Address Device Name MAC Address
    > 1 192.168.0.4 MYCOMUTER 00:21:91:DA:78:51
    > 2 192.168.0.31 RANGE EXTEND 00:21:91:DA:78:51
    >
    > Should't it be just one MAC address per device?
    >
    > Kent J.
    >
    >
    >
    >
    >
    > Bob I skrev:
    >> See
    >> http://www.google.com/search?hl=en&q=MAC+address&aq=f&oq=
    >> and
    >> http://www.google.com/search?hl=en&q=MAC+address+spoofing
    >>
    >> Kent J wrote:
    >>> What is a MAC-address anyway?
    >>> How can the address be the same?
    >>>
    >>> Kent J.
    >>>
    >>>
    >>>
    >>> Joel Guzman skrev:
    >>>
    >>>> Yes its a problem
    >>>>
    >>>>
    >>>> On 12/16/08 5:19 PM, in article sPV1l.4890$,
    >>>> "Kent
    >>>> J" <> wrote:
    >>>>
    >>>>> OK!
    >>>>> I have a router with DHCP that provides PC:s running with a dynamic
    >>>>> IP-address and also a Dlink RangeExtender, with a static
    >>>>> IP-address,working as a slave.
    >>>>>
    >>>>> If I check attached devices from my router I'll get:
    >>>>>
    >>>>> # IP Address Device Name MAC Address
    >>>>> 1 192.168.0.5 MYCOMPUTER 00:21:91:DA:78:51
    >>>>> 2 192.168.0.31 DLINK 00:21:91:DA:78:51
    >>>>>
    >>>>> Different IP-address but the same MAC Address.
    >>>>> Is that a problem?
    >>>>>
    >>>>> Kent J.
    >>>>>
    >>>>>
    >>>>> Richard G. Harper [MVP] skrev:
    >>>>>
    >>>>>> It means what it says - the IP address your computer is trying to use
    >>>>>> is
    >>>>>> already assigned to another device on the network. Find the
    >>>>>> offending
    >>>>>> device by checking the IP address of all devices on the network, then
    >>>>>> change the address of one or the other devices - your PC or the other
    >>>>>> device on the network with the same IP address, whichever would be
    >>>>>> easiest.
    >>>>>>
    >>>>

    >>


    Get rid of the Locally Administered MAC Address, change the setting in
    Configure to "Not Present".

    Shutdown all your PCs and routers. Wait 30 seconds, Power up your router(s)
    and wait for them to settle, power up your PCs and check for problems.
     
    Tim Jackson, Dec 22, 2008
    #8
  9. Kent J

    Kent J Guest

    Tim Jackson skrev:
    > "Kent J" <> wrote in message
    > news:8UQ2l.4941$...
    >> I'm afraid I still dont' get it.
    >> I have three different MAC addresses that relates to MYCOMPUTER
    >>
    >> 1.) From ipconfig /all:
    >> Physical address: 00-19-5b-eb-34-52
    >>
    >> 2.) From 'Configure' on the network card:
    >> Local Administartion MAC Network Address: 00DEADBEEFCAFE
    >>
    >> 3.) From the router 'Attached Devices':
    >> # IP Address Device Name MAC Address
    >> 1 192.168.0.4 MYCOMUTER 00:21:91:DA:78:51
    >> 2 192.168.0.31 RANGE EXTEND 00:21:91:DA:78:51
    >>
    >> Should't it be just one MAC address per device?
    >>
    >> Kent J.
    >>
    >>
    >>
    >>
    >>
    >> Bob I skrev:
    >>> See
    >>> http://www.google.com/search?hl=en&q=MAC+address&aq=f&oq=
    >>> and
    >>> http://www.google.com/search?hl=en&q=MAC+address+spoofing
    >>>
    >>> Kent J wrote:
    >>>> What is a MAC-address anyway?
    >>>> How can the address be the same?
    >>>>
    >>>> Kent J.
    >>>>
    >>>>
    >>>>
    >>>> Joel Guzman skrev:
    >>>>
    >>>>> Yes its a problem
    >>>>>
    >>>>>
    >>>>> On 12/16/08 5:19 PM, in article sPV1l.4890$,
    >>>>> "Kent
    >>>>> J" <> wrote:
    >>>>>
    >>>>>> OK!
    >>>>>> I have a router with DHCP that provides PC:s running with a dynamic
    >>>>>> IP-address and also a Dlink RangeExtender, with a static
    >>>>>> IP-address,working as a slave.
    >>>>>>
    >>>>>> If I check attached devices from my router I'll get:
    >>>>>>
    >>>>>> # IP Address Device Name MAC Address
    >>>>>> 1 192.168.0.5 MYCOMPUTER 00:21:91:DA:78:51
    >>>>>> 2 192.168.0.31 DLINK 00:21:91:DA:78:51
    >>>>>>
    >>>>>> Different IP-address but the same MAC Address.
    >>>>>> Is that a problem?
    >>>>>>
    >>>>>> Kent J.
    >>>>>>
    >>>>>>
    >>>>>> Richard G. Harper [MVP] skrev:
    >>>>>>
    >>>>>>> It means what it says - the IP address your computer is trying to use
    >>>>>>> is
    >>>>>>> already assigned to another device on the network. Find the
    >>>>>>> offending
    >>>>>>> device by checking the IP address of all devices on the network, then
    >>>>>>> change the address of one or the other devices - your PC or the other
    >>>>>>> device on the network with the same IP address, whichever would be
    >>>>>>> easiest.
    >>>>>>>

    >
    > Get rid of the Locally Administered MAC Address, change the setting in
    > Configure to "Not Present".
    >
    > Shutdown all your PCs and routers. Wait 30 seconds, Power up your router(s)
    > and wait for them to settle, power up your PCs and check for problems.
    >
    >
    >

    Thanks!
    Now it seems to work. I have different MAC-adresses.

    3 192.168.0.4 MYCOMPUTER 00:19:5B:EB:34:52
    4 192.168.0.31 RANGE EXTEND 00:21:91:DA:78:51


    Kent J.
     
    Kent J, Dec 23, 2008
    #9
  10. Kent J

    Tim Jackson Guest

    "Kent J" <> wrote in message
    news:Ja94l.5048$...
    > Tim Jackson skrev:
    >> "Kent J" <> wrote in message
    >> news:8UQ2l.4941$...
    >>> I'm afraid I still dont' get it.
    >>> I have three different MAC addresses that relates to MYCOMPUTER
    >>>
    >>> 1.) From ipconfig /all:
    >>> Physical address: 00-19-5b-eb-34-52
    >>>
    >>> 2.) From 'Configure' on the network card:
    >>> Local Administartion MAC Network Address: 00DEADBEEFCAFE
    >>>
    >>> 3.) From the router 'Attached Devices':
    >>> # IP Address Device Name MAC Address
    >>> 1 192.168.0.4 MYCOMUTER 00:21:91:DA:78:51
    >>> 2 192.168.0.31 RANGE EXTEND 00:21:91:DA:78:51
    >>>
    >>> Should't it be just one MAC address per device?
    >>>
    >>> Kent J.
    >>>
    >>>
    >>>
    >>>
    >>>
    >>> Bob I skrev:
    >>>> See
    >>>> http://www.google.com/search?hl=en&q=MAC+address&aq=f&oq=
    >>>> and
    >>>> http://www.google.com/search?hl=en&q=MAC+address+spoofing
    >>>>
    >>>> Kent J wrote:
    >>>>> What is a MAC-address anyway?
    >>>>> How can the address be the same?
    >>>>>
    >>>>> Kent J.
    >>>>>
    >>>>>
    >>>>>
    >>>>> Joel Guzman skrev:
    >>>>>
    >>>>>> Yes its a problem
    >>>>>>
    >>>>>>
    >>>>>> On 12/16/08 5:19 PM, in article sPV1l.4890$,
    >>>>>> "Kent
    >>>>>> J" <> wrote:
    >>>>>>
    >>>>>>> OK!
    >>>>>>> I have a router with DHCP that provides PC:s running with a dynamic
    >>>>>>> IP-address and also a Dlink RangeExtender, with a static
    >>>>>>> IP-address,working as a slave.
    >>>>>>>
    >>>>>>> If I check attached devices from my router I'll get:
    >>>>>>>
    >>>>>>> # IP Address Device Name MAC Address
    >>>>>>> 1 192.168.0.5 MYCOMPUTER 00:21:91:DA:78:51
    >>>>>>> 2 192.168.0.31 DLINK 00:21:91:DA:78:51
    >>>>>>>
    >>>>>>> Different IP-address but the same MAC Address.
    >>>>>>> Is that a problem?
    >>>>>>>
    >>>>>>> Kent J.
    >>>>>>>
    >>>>>>>
    >>>>>>> Richard G. Harper [MVP] skrev:
    >>>>>>>
    >>>>>>>> It means what it says - the IP address your computer is trying to
    >>>>>>>> use is
    >>>>>>>> already assigned to another device on the network. Find the
    >>>>>>>> offending
    >>>>>>>> device by checking the IP address of all devices on the network,
    >>>>>>>> then
    >>>>>>>> change the address of one or the other devices - your PC or the
    >>>>>>>> other
    >>>>>>>> device on the network with the same IP address, whichever would be
    >>>>>>>> easiest.
    >>>>>>>>

    >>
    >> Get rid of the Locally Administered MAC Address, change the setting in
    >> Configure to "Not Present".
    >>
    >> Shutdown all your PCs and routers. Wait 30 seconds, Power up your
    >> router(s) and wait for them to settle, power up your PCs and check for
    >> problems.
    >>
    >>
    >>

    > Thanks!
    > Now it seems to work. I have different MAC-adresses.
    >
    > 3 192.168.0.4 MYCOMPUTER 00:19:5B:EB:34:52
    > 4 192.168.0.31 RANGE EXTEND 00:21:91:DA:78:51
    >
    >
    > Kent J.
    >


    YW
     
    Tim Jackson, Dec 24, 2008
    #10
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