Gundavelli, S., Ed., Korhonen, J., Ed., Grayson, M., Leung, K., and R. Pazhyannur, "Access Network Identifier (ANI) Option for Proxy Mobile IPv6", RFC 6757, DOI 10.17487/RFC6757, October 2012, <https://www.rfc-editor.org/info/rfc6757>.