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Internet Sharing From iMac To MacBook With Port Forwarding?

Discussion in 'Mac OS X Server, Xserve, and Networking' started by Darkroom, Apr 22, 2009.

  1. Guest


    i am WELL lost!

    my situation: i don't have a wireless router. i have a DSL modem connected to my iMac via ethernet running Leopard. on my iMac i turn on "Internet Sharing" (with password protected airport options) so that i can access the internet using my iPod Touch and Nintendo Wii.

    i just bought a MacBook that i can also use on this network. however, i can only "surf the web" since my iMac's built-in AirPort card is only forwarding TCP ports 80 and 443. but i need to forward these ports:

    1. iChat = TCP 5298, 5190-5200
    2. FTP = TCP 20-21

    apparently suffering from a "Double NAT"(??) as my MacBook's automatically assigned IP is

    how can i forward these ports?
  2. macrumors member

    I remember doing something similar but not having that problem, could it be because the Firewall on the "host" computer is on?!?

  3. Guest


    nope, the iMac that is sharing it's internet over AirPort is set to allow all incoming connections.

    Attached Files:

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