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Remote file access via double NAT

rwaterval
Star I

Can anyone help me to access my files on my QNAP NAS remotely? I looked on youtube, but I'm not able to get it to work. My knowledge in home networking is fairly limited, so I hope you can explain it in easy terms to me.

I have the following situation: a Zyxel EX56 modem from my ISP, and behind this modem, an ASUS Zenwifi AX router (meshed with two other ASUS Zenwifi AX routers).

The Zyxel modem is connected to the internet (iii.sss.ppp.adr). It has the subset 192.168.1.xxx. The Asus Zenwifi AX is connected to this router on 192.168.1.yyy. To log into my Asus router at home, I have to use the subset 192.168.50.xxx. My QNAP NAS is located on 192.168.50.qqq. I think this is described as a double NAT configuration.

This is what I did sofar:
1. Set-up port forwarding on my Zyxel modem to (192.168.1.yyy, UDP, port 1194) to my Asus Zenwifi router
2. Set-up port forwarding on my Asus Zenwifi router to (192.168.50.xxx, UDP, port 1194)
3. Created an opvn file via my Asus Zenwifi router and changed the first line "remote 192.168.1.yyy 1194" to "remote iii.sss.ppp.adr 1194"
4. Added the opvn file to the OpenVPN client on my laptop. I included the username and password from my Asus Zenwifi router.

I then use the mobile hotspot wifi of my iPhone to connect my laptop to the internet. The OpenVPN client appears to connect without issues. However, I still can't open my files and/or folders on my QNAP NAS.

What am I doing wrong? Can anyone give me advice?

Thanks in advance!!!

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