Thanks L&LD
As it is not directly related with other infos I have found when I was looking to solve the issues, I though it could someone help to find the right direction.
As additional info. A good App for troubleshooting the mdns issue was in my case the App discovery...
I want to share info about issues i could recently solve.
I haven‘t seen my via ethernet attached shield as a chromecast target any more. I found out that I had to disable „Enable IGMP Snooping“ under wireless professional and the shield has shown up again.
The other issue I could solve was...