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Help! Frequent disconnects on local crossover connection...

Discussion in 'Networking' started by ytsejam677, Mar 26, 2010.

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  1. ytsejam677

    ytsejam677 Thread Starter

    Mar 26, 2010
    I have set up my personal laptop (Macbook) on a crossover connection with my laptop at work (Windows XP). My work laptop is connected to the company’s network which doesn’t allow personal computers to be connected to. Since the work laptop’s internal NIC is connected to the network, I have connected a USB to LAN adapter to the USB port and connect it with the NIC on my macbook via a crossover cable. I set the work laptop IP as with subnet mask and the macbook IP as and same subnet mask. The connection works fine and I am able to share files between them.

    However, 1 very frustrating problem. The crossover connection disconnects and reconnects frequently (every 5-15 minutes). Looking at the Windows XP event viewer, there is a TCPIP 4201 event every time it happens. Here is what the event looks like:

    Product: Windows Operating System
    ID: 4201
    Source: Tcpip
    Version: 5.2
    Message: The system detected that network adapter %2 was connected to the network, and has initiated normal operation over the network adapter.

    This would be a normal event if it didn’t happen so often, indicating my connection has recovered from a disconnect.

    I thought it might be the USB to LAN adaptor malfunctioning so I replaced it with another one: no luck. I thought it might be the crossover cable so I tested it between 2 macs with a gigabit connection and pinged continuously for about and hour but got 0% packet loss. Both comps are up to date with updates and drivers as far as I can tell. I tried forcing various transfer speeds including full & half duplex modes: no luck.

    I should also mention that the USB to LAN adaptor is not gigabit, but rather 100/10. The Macbook’s NIC is gigabit and the crossover cable is CAT 5e, which supports a gigabit connection, but is forced to transfer at 100baseTX (either automatically or manually) to accommodate the other NIC’s speed. I’m not sure if this is part of the problem, but thought it might be worth mentioning.

    If anyone has any insight into this issue, please lend me your wisdom! Also let me know if I should provide device details or logs.

  2. JohnWill

    JohnWill Retired Moderator

    Oct 19, 2002
    The key statement here.
    We don't assist in bypassing company network restrictions, please refer to the TSG Rules.
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