ipt_NETFLOW - Форумы NAG.RU
http://forum.nag.ru/forum/index.php?s=8b3a4967a6e80673cbe5518c91520d10&showtopic=53979&pid=482449&st=20&#entry482449 pieces of info about how to compile and use ipt_netflow kernel module on centos 5
http://forum.nag.ru/forum/index.php?s=8b3a4967a6e80673cbe5518c91520d10&showtopic=53979&pid=482449&st=20&#entry482449 pieces of info about how to compile and use ipt_netflow kernel module on centos 5