http://www.rfc-editor.org/rfc/rfc7125.txt
RFC 7125: Revision of the tcpControlBits IP Flow Information Export (IPFIX) Information Element, B. Trammell, P. Aitken2014-02-01T23:00:00-00:00This document revises the tcpControlBits IP Flow Information Export (IPFIX) Information Element as originally defined in RFC 5102 to reflect changes to the TCP Flags header field since RFC 793.