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No connection when not going thru router. Why?

Discussion in 'UO Resources' started by Beer_Cayse, Sep 6, 2010.

  1. Beer_Cayse

    Beer_Cayse Guest

    Three times in the last 4 months I've had crappy connection speeds and have called for Tech Support form Time-Warner - RoadRunner.

    I have a wired network with each PC (mine, son and wife) each going to a port on a 4-port router then the router goes to the cable-modem. The router is about 2 months old - I replaced that when I determined a port was bad on the old one.

    The cable-modem I have now is new (to me) on July 19th. Each time I have called, one cycle of tests needs to be a PC (mine usually) connected directly to the modem. When I do that, Windows reports no connection but if I flip it back to the router, connection is restored.

    The system is powered off during the changeover. I've tried using IPCONFIG to establish connection ... no success.

    MOBO: Gigabyte MA78GM-US2H
    CPU: AMD Athlon XP dual-core 3.0 ghz
    RAM: 4 GB DDR2 800 RAM (2 x 2GB)
    VIDEO: nVidia GeForce 8400GS - PCiExpress x16 - 512 MB
    HD #1: Western Digital 320 GB SATA
    HD #2: Western Digital 320 GB EIDE w/SATA converter
    ** drives are NOT in any RAID configuration
    OPTICAL 1: LiteOn DVD/CD combo (burner) - IDE master
    OPTICAL 2: LiteOn CD/RW (burner) - IDE slave
    CASE: Raidmax Smilodon 500w
    KEYBOARD: Logitech G-15 Gaming keyboard (3 banks 18 macro keys) - USB
    MOUSE: Dell optical mouse - USB

    OPER SYS: XP/SP3 patched thru Aug 23rd

    So - any idea why I cannot attach directly to the modem at all? Thanks.
  2. IanJames

    IanJames Certifiable
    Stratics Veteran Alumni

    May 19, 2008
    Likes Received:
    Does your cable company require a specific MAC address to allow a connection? Maybe your router has the MAC address recognized by the cable company and your home pc does not?
  3. Shamus Turlough

    Shamus Turlough Lore Master
    Stratics Veteran Alumni

    May 19, 2008
    Likes Received:
    This. Most cable internet modems use MAC address authentication to establish an internet conenction. The way around this is to let the modem sit powered off for about 10 minutes in between changing what is plugged into the modem. This will clear the "remembered" MAC address.
  4. Beer_Cayse

    Beer_Cayse Guest

    If you're referring to a static IP, the answer is yes - ISP can set one up, but no I do not use one. It's a dynamic IP.
  5. Beer_Cayse

    Beer_Cayse Guest

    Ten minutes, huh? Most I've waited is about 1 minute. The modem I have ia battery backup so powering it off also includes removal of the battery. What a pain in the butt!

    I'll remember the 10 minutes tho ...maybe that's what the issue is. Thanks!
  6. Gilmour

    Gilmour Certifiable
    Stratics Veteran Stratics Legend

    Nov 19, 2003
    Likes Received:
    first tip.

    go to a dospromt and type

    ipconfig /flushdns
    also check your pc ip settings, depending on windows you get to them a bit differently, but in control panel should be a network connections thing, right click -> properties.

    is ip, gateway and dns configured?
  7. Harlequin

    Harlequin Babbling Loonie
    Stratics Veteran

    Jun 11, 2008
    Likes Received:
    This is what I guess the issue is as well. I have to do the same thing when I switch to direct connection for testing.