ITSSv6 aims at developing a reference open-source IPv6 ITS Station stack available to European and national third parties (projects, industry and academia) using IPv6 for Internet-based communications in Field Operational Tests (FOTs) of Cooperative Systems. The IPv6 networking capabilities of the ITS Station under standardization at ISO TC204 WG16 (CALM) and ETSI TC ITS are extended with additional IPv6 features required for operational deployment of Cooperative Systems i.e. enhanced performance, embedded security, remote management of deployed systems and ease of configuration. New features and their perfect integration within the ITS Station architecture (particularly ITS Station management and ITS Facilities) are specified. The project takes as an input the FP6 CVIS core communication software and additional modules developed by FP7 GeoNet. It produces an enhanced IPv6 ITS Station stack adapted to operational use in large scale FOTs to the benefit of a variety of Cooperative Systems applications which require Internet communications (road safety, traffic efficiency and infotainment types of applications). The new software is validated on a basic open platform with recommended physical interfaces (802.11p and 3G). The project gathers key partners from the CVIS and GeoNet projects and key expertise in the specification and development of the IPv6 software. Reasonable resources are allocated for the training, portability and integration of the released ITSSv6 stack to a selection of third parties involved in FOTs. Prospective users are constantly informed of the progress of the project through a user forum and regular newsletters, software version releases and bug fixes. Project partners actively participate to the continuing standardization effort and to fill up gaps in standards whenever relevant. In parallel, a scientific evaluation of the performance of the IPv6 stack is performed both indoor under idealistic conditions and outdoor under realistic situations.