The deployment of wireless ad hoc networks is useful for people when they desire to communicate even if they are not connected to any infrastructure, with the purpose of playing games, sharing internet connection, or exchange files. In some ad hoc scenarios, they might know each other, so they can establish trusted relationships. However, if the number or users and mobility increase then it is more complicated to trust all users and a security mechanism is required. Few researches has been done in this field to find security solutions for MANETs deployments; one of them proposes a framework where the traditional AAA services are distributed inside the network with the idea of allowing secure exchange of services that could be chargeable. Based on this framework, we evaluate technical solutions, focusing mainly on the Authentication service; in order to have real implementations. One possibility is using virtualization technology to offer a de-centralized authentication service. Another solution is the development of a secure version of a routing protocol that uses a de-centralized authentication service as a previous requirement to allow any node to join the ad hoc routing domain