@TP-Link Thanks for the answer, but there is a misunderstanding here ... "HOMENAS7" is not a NAS but a normal Windows 10 PC which is communicating with Google Servers via IPv6, this is normal...

I rather enjoy my Deco X60 set, same as i did enjoy the Deco M5 set I used before. I'm in the lucky situation that my ISP supports both IPv4 and IPv6, so beside having a static IPv4 address, I also...