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Any help would be greatly appreciated.

I split/share an internet connection with family members that live next door to my house. I don't have/need/want cable, so they have the modem. I have admin/config access to all components involved.

I have a NAS server on my end that I cannot figure out how to access from outside my LAN. My network components are arranged thusly:

Internet
|
|
V
[next door]
|
|
V
ISP Cable Modem
|
V
Router: D-Link DI-524
|
|
[my house]
|
|
V
Access Point: UBNT Nanostation (necessary for reliably strong WiFi signal from next door)
|
V
Router: Engenius ESR1221 (EXT)
|
V
NAS: Synology ds210j

It took me forever just to configure an internet connection to my house through all of those components, I'm maxing out my knowledge-level here.

I've worked on accessing the NAS, off & on, for months with no luck. I've tried accessing different components (file server, ftp, vpn server, etc.), with SSL / without SSL, I've forwarded ports, DMZ'd inner router, DMZ'd the NAS, setup a dynDNS account. All in such a disorderly fashion that some combination thereof may be the answer & I danced around it.

At any rate, I'm looking for an explanation of the networking concepts to do this (if one exists) that ignores what I've tried so far & focuses on the components involved. Thank you!

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