Call of Duty: Modern Warfare 3 - Dedicated Server App
The Call of Duty: Modern Warfare 3 - Dedicated Server App is only supported for use with the Mac App Store release of Call of Duty: Modern Warfare 3.
PLEASE NOTE: The Dedicated Server app is currently only supported on OSX 10.11.6 and 10.12.
1) Launch Modern Warfare 3.
2) From the game launcher, select Download Dedicated Server App.
3) Select Free Download from the Aspyr web page.
The dedicated server app should appear in Downloads.
4) Launch Terminal.
5) Drag and drop the executable into Terminal.
6) Copy & paste the following line of text into Terminal:
+set sv_maprotation default +start_map_rotate +set dedicated 2 +set net_ip 0.0.0.0
7) Press the Return key.
The dedicated server is now running.
Your server will only show up if port forwarding is set up. Visit this link for more info: https://portforward.com/router.htm