iMac & MacBook no Internet over LAN but WiFi works.

Discussion in 'macOS' started by Glumpfner, Nov 3, 2011.

  1. Glumpfner, Nov 3, 2011
    Last edited: Nov 3, 2011

    Glumpfner macrumors regular

    Dec 15, 2009
    Hi there,

    I have a PC that is connected to the router via LAN cable. I have a MacBook Pro, which is connected via WiFi to the router. Both work.

    Today I bought an iMac to replace my old Windows PC. Because I want the fastest internet speed possible, I prefer to use the LAN cable. Now comes the strange part.
    My Mac gets a proper IP address assigned (, but I can't connect to the internet. No website loads, nor can I ping anything.
    I checked on the router (Zyxel NBG420N), no filters for LAN are set and in the client list of the router, the iMac is listed correctly. The only thing I have set are MAC filters for the WiFI, but that should not affect the LAN.
    So I turn on the WiFi on the iMac and it works perfect. But as I said I want to use the LAN cable.

    I now noticed same thing on my MacBook Pro. When I use WiFi, all works. When I plugin the LAN cable, I get an IP address assigned, but no websites load and I can't ping anything, as if there is a problem with the DNS.
    I also tried setting, as DNS servers, but didn't help.

    Even stranger, on my old Windows XP machine, the LAN cable works without a problem. Plug and Play. I also checked the LAN settings on my Windows PC, its all set on DHCP/Automatic, no extra settings.

    So it seems since the Windows PC works but neither the MacBook Pro (10.6) nor the iMac (10.7) that it's a MacOS X related problem.
  2. Glumpfner thread starter macrumors regular

    Dec 15, 2009
    Maybe I should rephrase it.

    Does anyone know why when I connect my MacBook Pro/iMac via LAN cable to my router, I get an IP address assigned, but cannot actually get into the internet? As if the DNS server is not responding. WiFi works perfectly.

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