The Internet of Things (IoT) is fast becoming a global phenomenon and many issues are arising such as standardization, deployment of IPv6, sensors’ energy requirements and security among others. However, without a secure network routing system IoT nodes will be exposed to malicious activities on the network, data compromises, privacy invasion and even acts of terrorism could be perpetrated via the teeming billions of IoT nodes. Various MANETs secure routing protocols have been proposed by researchers which could be utilized in the development of secure routing protocols for the Internet of things, thus the study of these secure MANET routing protocols will give a direction for the development and incorporation of secure routing in the Internet of Things. This paper surveys secure routing protocols in MANETs while proposing some secure MANET routing features for enshrining confidentiality and integrity in IoT routing. This paper also discusses research trends and future directions in the area of security of IoT networks.