Oppo BDP-105 and Qnap TS-251A

" I currently run a cable from my router to the NAS, and another from the router to the Oppo. There is only one ethernet port on the Oppo 105 so if you are running an ethernet cable from the NAS to the Oppo they are linked to the network in series. Is this what you are suggesting?"

Hi ifanpayne,
     I'm suggesting the way you have things connected now is sending the digital signal to your 105's internal dac so you really don't need to change a thing. 
     My setup is linked to the network in series, I have an ethernet cable from the router to my Synology NAS and another ethernet cable from the NAS to my 105.  You could do the same but I don't believe there will be any benefits in doing so. 
    I hope this clarifies things for you but, if not, let me know.
Tim

@noble100 - do you just connect Ethernet port of Synology with Ethernet port of  OPPO ? Does you Synology device contain some kind of network hub? and why do not connect OPPO to a router you connected Synology NAS to? I have Synology 414 and did not know about that type of functionality (it does have 2 Ethernet ports, but I thought it is for doubling the speed with routers supporting such feature)...
Interesting.

mikaelkuz,
     
    My mistake, I gave some incorrect info on my last post. I have the Synology 112J and just switched from AT&T to Comcast/Xfinity as my internet provider.  The new router/modem has 4 ethernet inputs so I have the Synology connected to one and the Oppo connected to another of these.

Sorry about that,
      Tim

Ah, that makes more sense. Thanks for the update.