Mac OS X: Set Port Forwarding Nat Router (Internet Sharing)

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Here are the steps to set up port forwarding on a Mac using NAT router (Internet Sharing):

  1. Go to System Preferences and click on Sharing.
  2. In the left sidebar, select Internet Sharing.
  3. In the right-hand panel, select the internet connection you want to share from the “Share your connection from” dropdown. For example, if you want to share your Wi-Fi connection, select Wi-Fi.
  4. Select the interface to which you want to share the internet connection to. For example, if you want to share the internet connection to a device connected via Ethernet, select Ethernet.
  5. Click the “Wi-Fi Options” button to configure your wireless network. Set a network name and password and click OK.
  6. Check the box next to “Internet Sharing” to enable the internet sharing.
  7. Now, open Terminal and run the following command to forward a specific port:
sudo sysctl -w net.inet.ip.forwarding=1
sudo /sbin/pfctl -f /etc/pf.conf
sudo /sbin/pfctl -e
sudo /sbin/pfctl -t nat -a "nat-anchor" -f /etc/pf.anchors/anchor
echo "rdr pass on en0 inet proto tcp from any to any port [SOURCE PORT] -> [DESTINATION IP] port [DESTINATION PORT]" | sudo tee -a /etc/pf.anchors/anchor
sudo /sbin/pfctl -f /etc/pf.conf

Replace [SOURCE PORT] with the port you want to forward, [DESTINATION IP] with the IP address of the device you want to forward the port to, and [DESTINATION PORT] with the port number on the device you want to forward the port to.

  1. Repeat step 7 for each additional port you want to forward.

That’s it! You have successfully set up port forwarding on your Mac using NAT router (Internet Sharing).

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