Strange Networking Problem: Connecting one Mac to Wi-Fi causes another to lose internet

Discussion in 'macOS Sierra (10.12)' started by Compile 'em all, May 23, 2017.

  1. Compile 'em all macrumors 601

    Compile 'em all

    Apr 6, 2005
    hey guys, I need networking experts to help me out on this one.

    Network Config:

    (Internet) <-> Modem <-> Airport Express (Bridge Mode) <Wifi> Mac 1 , Mac 2

    Internet only works on one of these Macs at a time. If both are connected to the Wifi network at the same time, one of them doesn't work. By not working I mean, pinging say resolves DNS but packet loss is at 100%. Sometimes a couple of packets would come back but mostly internet isn't reachable.

    Both devices do receive different IPs via DHCP from the modem.

    The network has other typical Apple devices on it like iPhones and iPads. They all work fine until Mac 2 comes on the same network. Then internet on these devices also stops working.
  2. BrianBaughn macrumors 603


    Feb 13, 2011
    Baltimore, Maryland
  3. zone23 macrumors 68000

    May 10, 2012
    If I didn't know better I would say you don't have a router..

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