Package conntrack implements the Conntrack subsystem of the Netfilter (Netlink) protocol family. The package is intended to be clear, user-friendly, thoroughly tested and easy to understand. It is purely written in Go, without any dependency on Cgo or any C library, kernel headers or userspace tools. It uses a native Netlink implementation (https://github.com/mdlayher/netlink) and does not parse or scrape any output of the `conntrack` command. It is designed in a way that makes the user acquainted with the structure of the protocol, with a clean separation between the Conntrack types/attributes and the Netfilter layer (implemented in https://github.com/ti-mo/netfilter). All Conntrack attributes known to the kernel up until version 4.17 are implemented. There is experimental support for manipulating Conntrack 'expectations', beside listening and dumping. The original focus of the package was receiving Conntrack events over Netlink multicast sockets, but was since expanded to be a full implementation supporting queries.