## Appendix B About the Survey Participants  
In order to achieve useful results with the survey, high-quality input by expert practitioners was necessary who knew about IPv6 and have possibly implemented it as well. Therefore, the Web was searched for expert forums and blogs, and four sources were identified. Two of the sources were expert groups with restricted access in social networks for professionals (Xing and LinkedIn). Another source was an IPv6 group on Facebook, with restricted access as well. The last source was the IPv6 forum of Hurricane Electrics, a large ISP in the USA. The survey results show that of the valid participants, _i.e._, participants who answered at least all comparison questions of the survey, and not only with defaultvalues; six people came from LinkedIn, eight from Facebook and the other 20 either from Xing or the Hurricane Electric forum.  
Participants of the survey have also been asked to give background information. These questions where about the country of origin, the industry they work in, their job role and department. Most participants of the survey came from Germany (48%). The rest was spread over several countries. There were three participants from Belgium and two from Ireland. It is worth mentioning that only five of the 34 valid participants came from outside of Europe. Figure 11 shows a graphical representation of the origins of the participants.  
Participants were also asked to give information about the industry they work in. The choices given were university, government, IT and communication industry, or other (Figure 12). The clear majority of the participants came from the IT and communication industry (25 of 34). One of the participants came from a governmental organization and six from a university, while two did not belong to any of the three.  
Another question regarding background information of the participants was for the department that they were working for (Figure 13). Six choices were given: development, research, consulting, operations, IT management and other. Due to the industry most participants work in, it was not surprising to find that most participants came from consulting (7), operations (8) and IT management (9). Four participants each work in development and research departments, while two did not fit into any of the given choices.  
In question four the participants were asked to provide information about their job role. This was an open question, so every participant could write down their own answer, which were mapped to the following categories: Network/System Architect, Management/CEO, Student/Trainee, Consultant, Security Engineer, Other (Figure A4). Surprisingly many CEO's and managers (9) took part in the survey. This might indicate high interest of decision makers on the topic. Another well represented group was the group of network and system architects (9) as well as security engineers.  
Figure A5 shows the results of a self-assessment on IPv6 knowledge in the five categories shown at the bottom. There are only few people who had no knowledge in one ore more areas. Only one person did not know about the _IPv6 Specification and Address format_ and _Transition Methods_. Two did not know much about _IPsec and ICMPv6_ and _DHCPv6 and Autoconfiguration_. _Routing and DNS_ is the only category where everybody had at least basic knowledge. More than 60% have at least advanced experience in all five categories, with _IPsec and ICMPv6_ having the least and _IPv6 Specification and Adressformat_ having the most experts.  
The last background question of the survey was about experience with the implementation of IPv6. Figure 14 shows the results. 12% never implemented IPv6, while 26% of the participants are in progress of deployment, and another 12% did it once. 50% have implemented IPv6 more than once and 18% of these even consider themselves as implementation experts.