How does the security model work for external USB disks attached to an AEBS

I've attached a USB disk to my AEBS after partitioning it first on my MBP using Disk Utility. I created a single partition with a GUID partition table covering the entire disk. Next I deselected the "Ignore ownership on this volume" checkmark and assigned myself and my wife read/write access, my group read access, and the rest no access. Next, I hooked it up to the AEBS and created some test files. I noticed in Terminal that the files I created all had rwx access for user, group and others. Trying to chmod that into something less open, like rwx for me, rx for the group and nothing for others didn't work. Also I noticed that when I was logged in the files I had created had my name as the owner, but when my wife logged in, those same files were owned by my wife.
What is happening here ? Who is the actual owner of the files on the external USB disk on my AEBS, and what are the real access rights (as they seem to depend on the actual user). On my AEBS I've setup "File sharing", "With accounts" and created accounts for both me and my wife, as well as disabled guest account access.
I get the impression that the owner and access rights seem to depend on the actual user connected to the AEBS, but I'm not sure.
Can anybody please enlighten me on the subject of AEBS access rights/ownership for USB disks ?
With kind regards,
Aloy

All that I can provide is what has worked for me for years.
The Time Capsule is setup as the router for the network, connected to a simple Zoom 5431J cable modem.
Static Internet IP connection from the cable provider is 12.34.567.89
By default, the Time Capsule is at 10.0.1.1 on the local network
Port Mapping setup for the Time Capsule is......
Public UDP Port 8884
Public TCP Ports 8884
Private IP 10.0.1.1
Private UDP 548
Private TCP 548
The hard drive on the Time Capsule is accessed from a remote location at afp://12.34.567.89:8884
The AirPort Extreme is connected by Ethernet to the Time Capsule and is it setup to operate in Bridge Mode
The AirPort Extreme always receives a reserved local IP address of 10.0.1.2 from the Time Capsule
The Port Mapping setup (on the Time Capsule) looks like this for the AirPort Extreme.......
Public UDP Port 8888
Public TCP Port 8888
Private IP 10.0.1.2
Private UDP 548
Private TCP 548
The USB hard drive connected to the AirPort Extreme is accessed from a remote location at afp://12.34.567.89:8888
If you are still having difficulty, I would delete all of Port Mapping settings on the Time Capsule and Update the Time Capsule. Then, go back and setup the Port Mapping for the Time Capsule, check that to make sure that it is working, then setup the Port Mapping settings on the Time Capsule for the AirPort Extreme.

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How does the security model work for external USB disks attached to an AEBS

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