Ethernet connection problems

Discussion in 'iMac' started by hahalant, Sep 8, 2010.

  1. hahalant macrumors newbie

    Joined:
    Sep 8, 2010
    #1
    I have recently had to stop using my wireless router and connect directly from my modem to the WAN port on my computer. However, I can only achieve an internet connection when I direct connect into my PowerBook G4. When I try to connect into my iMac, I get nothing. Any suggestions?
     
  2. Spike88 macrumors 6502a

    Joined:
    Jan 25, 2010
    #2
    .

    Unknown to some folks, a small number of Ethernet hubs do NOT "negociate" their speed, duplex and DHCP addresses very well. Especially when one product is from vendor A and the other product is from vendor B. As a suggestion, configure your "wired" HUB and Mac workstation with fixed values. For example, Full Duplex, 100 MPBs, and fixed IP Addressing. And, use the MTU Discovery / Set tool to configure your Mac with a fixed MTU value as well.

    If wondering, my iMac is using fixed MTU, Fixed (static) IP Addressing, fixed Router IP and fixed DNS IPs on its UTP "wired" connection. After applying these changes, my connection has been "solid as a rock".

    Note: If already using static IPs / values within your home network, then convert to default DHCP with auto/auto settings.

    Hope this helps...

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  3. Spike88 macrumors 6502a

    Joined:
    Jan 25, 2010
    #3
    .

    To set MTU within my iMac 21.5" (that can also be used for a MBP), I used a free MTU size Discovery / Set utility. With this tool (saved in my iMac's Applications - Utility folder), I manually set its MTU on all ports (ethernet, wireless, firewire, etc.) only once. Set it once and its done.

    This script can be found at:

    http://tumbleseed.wordpress.com/products/set-mtu/

    Note: Click on its "Download the Set MTU 0.2 script application (zip)" text - to obtain the script file.

    And yes, this script works great on mid-2010 21.5" iMacs using SL as well.

    Hope this helps as well...

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