We need some idea of the physical layout / topology of your network to give you a better answer. When in AP mode the Decos are just acting like a large switch and most services are from your router....

Looking at your traces here, I note that you are using Google DNS (8.8.8.8) to perform your recursive lookups. Whilst this kind of service can add performance, they (Google DNS, OpenDNS, etc)...

Not having that issue with my Synology NAS (different model though). Do you have ethernet link/data lights showing on the NAS? Is the NAS configured for DHCP, or a static address? If DHCP, is it...

I think we need to tease out some of what you have written in edit 2 as there may be something wrong there, but I’m not sure what from your wording.... Have you got more than one device issuing DHCP...

As a general rule direct transmission of VLAN tags is not supported by most WIfi devices - there is no space provided in the standard frame layout for the tag AFAIK. I believe some devices designed...

I realise this is probably just a typo in your post, but just in case: The address range you mention in your post is invalid. You cannot actually issue address 255 - it is reserved for network...