The NATFW NSLP, a protocol to signal to Network Address Translators and Firewalls in a path-coupled manner, is making progress.
The latest version is available at: http://www.ietf.org/internet-drafts/draft-ietf-nsis-nslp-natfw-14.txt
The presentation slide of today’s meeting can be found here that describes the most recent changes.
The changes are described in http://www.stiemerling.org/ietf/nsis/draft-ietf-nsis-nslp-natfw-14-from-13.html
A paper about the implementation experience is available with Implementation and Performance Study of a new NAT/Firewall Signaling Protocol.
The NSIS NATFW NSLP will be used by the 3GPP2 to deal with unwanted traffic and to have a solution for configuring firewalls.