I think you are confusing the protocols a bit. Synology VPN is not open to public protocol, it is their proprietary protocol. You can setup it with few clicks on RT2600ac and download the relevant apps. It is possible that Synology NAS has support for the same, I don't know as I don't own Synology NAS. But this protocol works in China with no issues, but you won't find this protocol at any of your flawed blogs etc. This is DIY solution.
I am not sure where you are talking your resources from but please change the blogs you are using as they are all flawed or heavily affiliated with marketings profits.
Tip if you have a 12VPN "proxy" connection running (as one blogger from your posts complain about it being more proxy than VPN), then you can always run proxifier.com on top of 12VPN, it will redirect all traffic including from all the apps (voip etc) to 12VPN proxy service.
Actually I use a variety of sources, some blog, Reddit, some of my own experiences or the experiences of a few friends in China. If you know better blogs, let me know.
But you are right that Synology VPN might work.
https://www.reddit.com/r/synology/c...amp&utm_medium=&utm_content=post_num_comments
And they are saying it is not working very well as the speed is slow so one of the recommendation is, you guess, Astrill.
And you are right, I do not have enough first hand experiences myself.
I only know two sure working ways in China -- mobile data roaming (tested in June 2017, Dec 2017 and Dec 2018) and company VPN (tested in June 2017 and Dec 2017). Then I tried a few free VPNs and SS providers in China during my Dec 2018 trip. They are not consistent.
I am going to test purevpn paid, Astrill free Android version and Windscribe free version this time (trip tomorrow). I will test a few free SS/V2Ray providers as well, including my own basic SS/V2Ray server on the Google Cloud VPS.
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