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IP conflict but no evidence of it

Discussion in 'Networking (Hardware & Software)' started by braindead, 2009/03/28.

  1. 2009/03/28
    braindead

    braindead Inactive Thread Starter

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    sry for the bad title but idk how else to describe it.

    here is my setup
    i have the WRT54GS router, thats how i get my internet.
    1 desktop is connected to it by cable (WinXP Pro SP3)
    2 laptops connect wirelessly (1 is WinXP Pro SP3, other is WinXP Home SP3)

    encryption is disabled cause Laptops have trouble connecting when its on
    i do have the MAC filter enabled and set to accept only....

    for the passed week (maybe 10 days) we got the IP conflict error message from windows (3 times including today as far as i know). I hadn't gotten the error it was always a family member who "reported" it after the fact and i told them: "just try the repair option its probably DHCP that's messing up ".
    But it just happened again, 1st thing i did was try the repair option, and i got the error again. I logged on to the router to see which PCs are connected (and what IP was assigned to then) I only saw the desktop and the XP home Laptop. (with 2 different IPs)
    I kept on receiving the IP conflict notification till i disabled the wireless network. (turns out Wifi is still active although "Wireless SSID Broadcast is Disabled" so Im guessing it's not broadcasting the signal publicly any more)

    I had noticed internet was slower today but i thought it was normal being the weekend, but now I am wondering if any1 managed to sneak in the network?

    i tried googling to see any info concerning PC's staying invisible on networks but i found nothing relevant.
     
    Last edited: 2009/03/28
    braindead,
    #1
  2. 2009/03/28
    TonyT

    TonyT SuperGeek Staff

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    MAC address filtering is practically useless for wifi security, the wlan can be sniffed and the mac address on the remote computer can be changed to one of yours and gain access to the wlan.

    I would:
    1. enable ssid broadcast. (disabling it does nor prevent others from seeing the ssid)
    2. use WPA2 encryption for the wlan.

    If your laptops have trouble connecting when using WPA then your wlan is misconfigured or your laptops networking is misconfigured or you are using 3rd party connaction software like the kind that comes from the wifi card manufacturer. (best to let windows manage the wifi connections)

    I'd also just use a static ip for the desktop, that way you can rule out any ip conflict for that computer.
     
    TonyT,
    #2


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  4. 2009/03/29
    braindead

    braindead Inactive Thread Starter

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    i am using the Windows Wifi "manager "
    when i disabled SSID broadcast i thought i was turning Wifi off.

    im not sure how it could be missconfigured but ill follow ur instructions and see if there is an improvement.

    im still wondering if a PC can log in my network but remain unseen.
     
    braindead,
    #3
  5. 2009/03/29
    TonyT

    TonyT SuperGeek Staff

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    1. good, let Windows manage wifi.
    2. disabling ssid broadcast doesn't turn of the wifi, it only prevents your ssid from showing up in the wlans list in windows. (view available wireless networks). Linux users can see it clearly and even windows-mac users can see if use 3rd party wlan monitoring software.
    3. ok.
    4. easily, one could spoof the mac address and use a static ip, and not show up in the router client's table.

    To know if someone is using your wlan you'd have to enable router logging or sniff the wlan yourself. If enable router logging be sure to disable it later as the logs can grow large and eventually cause trouble with the router.
     
    Last edited: 2009/03/29
    TonyT,
    #4
  6. 2009/04/07
    braindead

    braindead Inactive Thread Starter

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    sry for the delay but i had a few problems in the last week.

    in my original post i described my home network setup (but omitted how i connected to the internet thinking it wasn't relevant).

    I connect to a wireless LAN using the D-link DWL-2100AP (PPPoE connection).
    that network is connected to two ISPs (one for download and one for upload).

    a few weeks ago they added what they call a patch to my D-Link to boost my signal so clients that cant see there AP can get connectivity through me (which i agreed to so they stop black listing me every time my monthly transfer rates are too high).

    the patch: [​IMG]

    I hadn't realized back then but that's when the IP conflict warnings started appearing, I only thought that this might be the source of my problem today because I removed my router from the equation (on Sunday) and this morning i got the error again (so i contacted them and they are checking out the problem).
     
    braindead,
    #5
  7. 2009/04/07
    TonyT

    TonyT SuperGeek Staff

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    I have some misunderstanding here.

    Whos is your ISP(s).
    If using PPPoE then you have ADSL Internet access.
    It does not make sense that you have 2 ISPs, one for upload and one for download.

    I believe you meant to say you have 2 IP addresses asigned to you by the ISP.

    Your ISP provided that "patch" to you? LOL! It looks like a homemade antenna, or one that was yanked from a boxed antenna.

    What modem did the ISP provide you with? Did they also provide a router?
     
    TonyT,
    #6
  8. 2009/04/08
    braindead

    braindead Inactive Thread Starter

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    when I say PPPoE.

    i meant i "dial in wirelessly" to an access point about 200 meters from my house.

    reason why i have 2 ISPs is cause of the laws over here, bandwidth is expensive here DSL (1 mbs download, 256kbs upload = 80 USD per month and its caped to 10 GB per month).

    the company i deal with use to get there download from SatGate (russian satelite, but its illegal here to uploading using a satelite connection).

    idk who they use for download now but for upload as far as i know its a company called IDM (inconet data managemet).

    no modem that is what im trying to explain i just connect to a huge wlan that covers most of the country and through it i get internet.

    i have the WRTGS54 linksys router.
     
    Last edited: 2009/04/08
    braindead,
    #7
  9. 2009/04/08
    TonyT

    TonyT SuperGeek Staff

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    Still don't understand your complete setup.

    Why do you need the D-link DWL-2100AP if have a Linksys wireless router?
     
    TonyT,
    #8
  10. 2009/04/08
    braindead

    braindead Inactive Thread Starter

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    the D-link DWL-2100AP connects wirelessly to the WLAN that connects me to the internet.

    the Linksys router connects my PCs to the D-link.

    In a way the D-Link acts as a modem, were as the router lets me Share the internet connection with all my computers (as well as file and printer...)

    here is a diagram of the whole thing: http://i272.photobucket.com/albums/jj175/nsalamoun/PC help/th_setup-up.jpg

    1 - Internet
    2 - WLAN
    3 - My D-Link
    4 - My router
    5 - Desktop
    6 - Laptops

    Blue lines are my home wireless network.
    Red Lines are cable network connection.
    Green Line is wireless connection to the WLAN.
    Black Line is to the internet.
     
    Last edited: 2009/04/08
    braindead,
    #9
  11. 2009/04/09
    TonyT

    TonyT SuperGeek Staff

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    Understood.
    You WILL get IP conflicts if the DLink and the Linksys both are set to use DHCP.

    The ISP will assign a rourable IP(s) to the DLInk. The DLink in turn, if DHCP is enabled on it, will assign a non-routable IP to any LAN computers that connect to it, including the Linksys. The Linksys in turn will assign non-routable IPs to the computers connected to it.

    DLink default LAN IP is 192.168.0.1 and Linksys default LAN IP is 192.168.1.1.

    You'd be better off using the Linksys to connect to the WAN AP and use the DLink AP plugged into a Linksys LAN port.

    ISP AP --- Linksys wifi router --- Dlink AP --- wifi computers
    ........................ |
    ............. wired computers

    Or eliminate the DLink alltogether as it would be unnecessary.
     
    TonyT,
    #10
  12. 2009/04/09
    braindead

    braindead Inactive Thread Starter

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    i have had this setup for at least 2 years now, the IP conflict only appeared a few weeks ago.

    thx for the info though i will see which changes i can do.
     
    braindead,
    #11

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