Ipt-netflow is fast and effective Netflow exporting module for Linux kernel. Designed for Linux router with heavy network load. This is netfilter/iptables module adding support for NETFLOW target. It's not using conntrack for performance reasons.
ipt-netflow version 1.7 has been released. This version have improved compilation compatibility with latest Linux kernels (2.6.36.3 and 2.6.27) and bunch of small improvements. (Sorry no ChangeLog due to SourceForge malfunction.)
SourceForge.net Project Page:
http://sourceforge.net/projects/ipt-netflow/