A Netgraph node that acts as a link between a socket (TCP, UDP, SCTP, ...)
connection to an AYIYA server (e.g. the SixXS POPs) and a local network
interface (e.g. one that can route the IPv6 traffic for a SixXS tunnel).

WWW:		https://wiki.freebsd.org/SummerOfCode2015/AYIYASixXSNetgraphNode