  The Domain Name System (DNS) is one of the most fundamental components of the
Internet. While glue is widely used and heavily relied on in DNS operations,
there is little thinking about the necessity, complexity, and venerability of
such prevalent configuration. This work is the first to provide extensive and
systematic analysis of DNS glue. It discusses the availability implications of
glue and proposes the minimum glue records in terms of availability. It also
identifies the security vulnerabilities of glue as well as the limitations of
current countermeasures. Measurements show the wide occurrences of glue
redundancies and glue vulnerabilities.
