Because the game requires a persistent internet connection to verify player profiles and progress, standard repacks usually only grant access to the single-player campaign via modified connection emulators.
Downloading repacks from untrusted sources carries significant risks: pc call of duty modern warfare 3 cod mw3 full rip repack
This blog post provides a comprehensive overview of the Call of Duty: Modern Warfare 3 (2011) Because the game requires a persistent internet connection
For legitimate multiplayer, check your game files: check your game files: