Revitalizing the public internet by making it extensible

There is now a significant and growing functional gap between the public Internet, whose basic architecture has remained unchanged for several decades, new generation of more sophisticated private networks. To address this increasing divergence functionality overcome Internet's architectural stagnation, we argue creation an Extensible Internet (EI) that supports in-network services go beyond best-effort packet delivery. gain experience with approach, hope to soon deploy both experimental version (for researchers) prototype early adopters) EI. In longer term, making extensible will require community initiate oversee effort; paper first step in creating such community.