I came here because I am not sure which forum this should go in. I spent time in the OMV forum but I am not convinced that the issue is there.
In short I have been trying to forward ports from my ddwrt router (v3.0-r47377 std (09/07/21)) to docker apps running on Open Media Vault 5. I've been forwarding ports for years to apps running on various computers on my network without a problem. But I have yet to be able to get this working in an app hosted by Docker on OMV. Mumble, SABNzbd, Plex, etc - I have tried it with at least 10.
Here is everything I know:
- The issue happened on OMV 4 as well. It has also spanned 3 different DDWRT routers.
- I had no problem forwarding to apps running in a virtualbox windows pc running on OMV or any windows pc on my network.
- I can ping the OMV host from the router. Also, I have a simple network setup (no segmented areas).
- I have used online port scans to verify what I am seeing (they come back "good/open" when I point to the windows instances and "fail/filtered" when I point to OMV).
- In ddwrt I've tried both the "Port Forwarding" and "Port Range Forwarding", and within those tabs I have experimented with several options in each.
- I have never ever had a problem accessing a docker app by its port name internally. Example: I can access SABNZBD via port name in browser, Kodi boxes can access shared MariaDB instance via 3306, etc.
- I had hoped that the issue was caused by Google Wifi (double NAT) but I had removed those devices from my network several months ago when I moved to the Ubiquiti mesh system.
- I don't know if this is a clue but I have also had problems hitting my OMV box when I am using OpenVPN to access my home network. Just to be clear, this is something I rarely do and is not part of my base setup.
I am neither a networking expert nor a linux expert so I would greatly appreciate suggests for things that I could try.