Future wireless Internet envisions that thousands of embedded devices will be integrated to the Internet. These devices, which can be micro-controllers with radio and sensor components, require communication protocols to establish a network. But, some embedded devices have scarce RAM resource. Our work shows that it is possible to implement an IPv6 stack over Low power Wireless Personal Area Networks (6LowPAN) for RAM constrained systems. We are able to implement the RPL routing protocol with less than 512 bytes of RAM. To handle the hard RAM constraint, we develop a circular queue and a swap content mechanism from RAM to Flash memory. We develop a platform and tested the implementation with realist experiments. Our research has the potential for a great impact since it enables interconnecting many lower cost devices to the Internet.