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Wifi: OK... RJ45: LAN, but no Internet

Discussion in 'Networking' started by bobrob, Apr 18, 2011.

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  1. bobrob

    bobrob Thread Starter

    Apr 18, 2011
    I have a HP notebook running Windows 7 Pro that can access network shares and the Internet without issue over Wifi.

    However, when I connect to the same network over wired ethernet (Wifi disabled), it can still access network shares, but no Internet.

    Any ideas what might be the cause (other hardwired PCs can access both network shares and Internet normally) ?

  2. pedroguy


    Jan 28, 2001
    Welcome to TSG:
    Please describe what you mean by a "hardwired connection"
    Lan connection to the router or the modem ?Is this a combo unit ?
    Either way let me see:when "no internet access".
    Start, Run, CMD, OK to open a command prompt:
    (For Vista or 7 type CMD in the Search box after Start)

    In the command prompt window that opens, type the following command:

    Note that there is a space before the /ALL, but there is NOT a space after the / in the following command.


    Right click in the command window and choose Select All, then hit Enter to copy the contents to the clipboard.
    Paste the results in a message here.

    If you are on a machine with no network connection, use a floppy, USB disk, or a CD-RW disk to transfer a text file with the information to allow pasting it here.
  3. Rockn


    Jul 29, 2001
    If it is hardwired it looks like you are getting no DHCP info from a DHCP server for this connection.
  4. bobrob

    bobrob Thread Starter

    Apr 18, 2011
    Thanks, pedroguy. By hardwired, I mean physical UTP cabling:
    [PC]═══[TEGS80G gigabit switch]═══[WRT54g router/gateway]═══[cable modem].
    The S80G is the primary high-speed switch for non-Wifi PCs, while the 54g provides DHCP, NAT, Wifi, and 100mbps NAS and network printer connections. No other devices on the network exhibit the problem described. I don't have the notebook with me, so I'm unfortunately unable to do an ipconfig check.

    Rockn, if DHCP is the problem, how am I still able to connect to network shares? With no IP address, shouldn't those be inaccessible as well?
  5. Couriant

    Couriant Trusted Advisor

    Mar 26, 2002
    First Name:
    Sounds like a routing or firewall issue, or maybe DNS.

    When you do get that laptop back, with the ipconfig, do a ping test too: (use these commands in command prompt)

    ping yahoo.com > ping.txt
    ping >> ping.txt
    ping <default gateway> >> ping.txt & ping.txt

    Substitute <default gateway> for the default gateway listed in IPCONFIG. When you do the last command it will pull up a notepad with information in it. Copy and paste here.
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