Since you specifically mentioned "Multiplayer Link," it is worth noting the technical implementation of syncing.
Each player controls their own company and island chain. You can trade, form alliances, or go to war. anno 1800 lan multiplayer link
First, a crucial clarification. If you are looking for the "old school" LAN experience—where you click "IPX/SPX" or type in a local IP address without an internet connection— Anno 1800 does not support that natively. Since you specifically mentioned "Multiplayer Link," it is