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LAN connection won't work, but wireless does

My LAN connection stopped working suddenly and will not reestablish. It is connected directly to my modem properly, with all the components working properly as well, and yet there is limited-to-no connectivity. I have checked the ethernet cords, no issue there. I have contacted my ISP provider, who reset my modem and believe it is working fine, as well as toshiba tech support, reinstalling Intel Pro 100 LAN drivers, but nothing has worked. I believe the issue involves being unable to reset my IP address. My wireless adapter works fine as well. Does anyone have any ideas? Toshiba A105-S4211 Model# PSAA8U-0FJ02J

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  • dawipo May 01, 2010

    Thanks for your response. I'm not very familiar with manual operations so any directions on how to perform the IP address setup would be greatly appreciated.

  • dawipo May 14, 2010

    Hi. Sorry it took so long to answer back I just got my hands on another computer. I was able to successfully establish a local area connection beginning with, however I cannot access the internet still. Is this what you meant by connectivity? Is there another step to take from here? Thanks for your help.

  • dawipo May 15, 2010

    I am not currently using a router, I am connecting directly to the modem. I have been able to connect wirelessly to an unsecure wireless connection with the IP address The IP address was on a Mac that was able to connect via the modem to the internet, however I have not had the same luck with my PC. According to my ISP, and the fact that the Mac received internet, tells me the modem works fine.

  • dawipo May 15, 2010

    you are correct in what you said. I have a toshiba laptop. Do you have recommendations as to what i should purchase/where i should go to replace the ethernet port?

  • dawipo May 15, 2010

    Toshiba Satellite A105-S4211 Model# PSAA8U-0FJ02J

    Thanks again.

  • dawipo May 21, 2010

    So I bought one of the ethernet adapters you recommended, however it did not solve my problem. My modem and computer establish a connection using the adapter with the IP address, with data being sent and received, however no internet connection is available. Unlike my actual computer ethernet port, which when i try to connect says there is limited or no connectivity, there is no such message for the adapter. Does this mean it's not my ethernet port that is the problem then?

  • dawipo May 23, 2010

    Still no luck. As soon as I connect the cable the icon looks like it is going to connect, then disappears. I disabled all the other network adapters besides the new one, and nothing.


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It sounds like the LAN card may be going bad. You can see if manually setting the IP address in the settings of the LAN card will work. If that works, then the card's routine for negotiating IP address assignment is corrupted. You maybe able to get some more useful life out of it by doing this until you can replace the LAN card itself. If you need more instructions on how to set the IP address manually, reply back and I'll try to step you through it.

Posted on May 01, 2010

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  • Mark Tidwell
    Mark Tidwell May 01, 2010

    OK, you'll need to find the address series that your modem issues to computers attached to it. You'll also need the DNS server addresses (this can be found from another computer connected to the network or from the ISP). To find from another computer, you'll go into Network connections in the control panel, right click on the connection that is connected to the internet and click on status. Click on the Support tab and click on Details. Here you'll see the IP address assigned to the working computer (probably, the subnet mask, the default gateway, and the DNS server amongst other items. Make a note of each of the addresses of the above items.

    Now, on the computer that is giving you problems, go into Network Connections, right click on the LAN connection that has limited connectivity and click on Properties. Scroll down to the Internet Protocol (TCP/IP) item, click on it to highlight (don't remove the check mark), and click Properties. Click the radio button by Use the following IP address:

    Under IP address: you'll need to enter the same series of numbers with the exception of the last set (after the last decimal point) as was on the working computer. Make the last set of numbers between 1 and 255. Preferably above 200 so that you don't accidentally conflict with another address on the network.

    The subnet Mask will be the exact same set of numbers as you found on the operating computer.

    The same for the default gateway and Preferred DNS server. If you had a second DNS server number on the working computer, enter it in the Alternate DNS server box.

    Click OK. Click OK and if the LAN card is working, you'll have connectivity. If this doesn't work, you'll need to use either your wireless or get a new LAN card.

  • Mark Tidwell
    Mark Tidwell May 14, 2010

    The DHP server function of the router has quit working because it is not assigning IP addresses. Addresses that begin with are self assigned by Windows. In this case, the router itself is not working properly. You can try to reset the router by pressing the reset button for 15 seconds or so, this will cause it to do a factory restore reset. If this does not give you connectivity, then the router/modem is suspect. Cable modems are configured by the ISP, so you don't have any options there.

    You mentioned that the wireless works fine though, what IP address do you get with the wireless? You can try plugging in the numbers as described in my previous post from the number sequences that you find associated with the wireless card.

  • Mark Tidwell
    Mark Tidwell May 15, 2010

    OK. I want to be sure I understand. You were able to connect to a wireless network that is not associated with your network which means that your wireless is working. This means that your ethernet port on the computer is no longer working and needs to be replaced. Is this a laptop or desktop/tower computer? If a laptop, you'll have to get a USB or PCMCIA ethernet card. If a desktop/tower, you'll need to purchase an ethernet card that is compatible with the bus inside your computer (PCI, PCIe, etc.)

  • Mark Tidwell
    Mark Tidwell May 15, 2010

    Please provide the model number of the Toshiba laptop and I'll look it up for you and give you a few options.

  • Mark Tidwell
    Mark Tidwell May 16, 2010

    The following link provides a number of compatible cards.

  • Mark Tidwell
    Mark Tidwell May 21, 2010

    Make sure the old adapter is disabled (check the Device manager under Manage Computer when you right click on My Computer). When you attempt to connect to the internet, the browser may still be trying to connect through the old port.


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