The operating system blocks the specific incoming and outgoing UDP/TCP ports required by Capcom's engine.
When it works, you get perfect, sub-5ms latency with no internet dependency.
If you’ve searched for a way to play Resident Evil 6 over a local area network (LAN) without an internet connection, you’ve likely come across mentions of a or “LAN crack.” This post explains what that fix actually does, why it’s needed, and what you should know before using it.
Press Windows Key + R , type ncpa.cpl , and press to open Network Connections.
For versions of the game that do not natively support Steam-based invites or for playing offline, community tools can simulate a LAN environment:
