ipt-netflow is high performance NetFlow exporting module for Linux kernel (up to 3.11). Designed for Linux router with heavy network load. This is netfilter/iptables module adding support for -j NETFLOW target. Designed to work efficiently w/o conntrack. Supporting NetFlow protocols v5, v9, and IPFIX. Accounting for IPv4, IPv6 traffic, and NAT translation events (NEL).