It's easy to share your Internet with AirPort by checking "Internet Sharing" in the system preferences, but this option asumes you want to create a new wireless network. Is there an easy way to configure Internet sharing if you want to use an already existing network?

I want my laptop to use the existing wireless AP and share its internet to other clients within this network. Tried manually running natd -interface ppp0 without luck

Got it working

For anyone interested, these were the steps:

  1. sysctl -w net.inet.ip.forwarding=1
  2. natd -interface ppp0 -dynamic
  3. ipfw add divert natd all from any to any via ppp0

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