My question is if it's possible to configure machines with stateless autoconfiguration and servers with manual configuration (for example, prefix::1 or prefix::24). Sould i mix this mechanism? Could i have collisions of adresses between stateless autoconfiguration and manual configuration of IPv6 addresses?
yes, you can do it with some "safety"... Stateless configuration is based on the MAC address of network card plus the Router/prefix announce made by the router. As long you dont have a strange MAC like 00:00:00:00:00:01 you should be fine. Take a look of how the MAC is used and you will understand. -- Christian Lyra PoP-PR/RNP