= Overview = Following the lastest successful workshop in Sevilla, Andalusia, Spain in september 2005. We are happy to announce the next edition in the workshop series. This year the event will be hosted in Karlsruhe, Germany from October 11th to 14th, 2007. For more information, please visit the official website of the workshop [1]. = Attendance = The attendance is free but requires an invitation. You may consider attending if you are involved in any aspect of the Netfilter development. Please, send us an email to coreteam@xxxxxxxxxxxxx before July 7th, 2007 (strict deadline). We have a very limited number of invitations! = Call for Participants = Are you involved in any awesome third party Netfilter related project? If your answer is yes then you have a chance to come and show us your project during the workshop days. In case that you are interested, please send us a fast abstract before July 7th, 2007 (strict deadline) to coreteam@xxxxxxxxxxxxx in latex, docbook or odt format. The abstract must have 1000 words maximum provinding an introduction, targets, solution proposed and experimental results if any. You must also provide the source code under a GPL-compatible free software license. The source code requirement is mandatory. The program committee will select two candidates from all applications received whose travel and accomodation expenses will be funded by our sponsors. Pablo, on behalf of the Netfilter core team [1] http://workshop.netfilter.org/2007/ -- The dawn of the fourth age of Linux firewalling is coming; a time of great struggle and heroic deeds -- J.Kadlecsik got inspired by J.Morris