IPv6 appears to still be enabled.....
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What make and model modem/router is the ISP providing?
And that device is configured and working as the network Router/ Gateway (192.168.1.1) with all other routers having DHCP disabled. However, there actually is only one other "router" which is serving as an Access Point with its' DHCP functions disabled.,
"DNS, 192.168.x.x" but is currently/actually configured to be 192.168.1.1 - correct?
(Where the quote's intent was to show that the DNS changed with respect to other devices (routers) being used and that those other devices used default IP addresses such as 192.168.0.1.)
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This router/Access Point?
https://www.amazon.com/TP-Link-AX3000-Archer-AX55-Pro/dp/B0BTD7V93F?th=1
Does the following link present the User Manual for the Access Point?
https://static.tp-link.com/upload/manual/2023/202312/20231201/1910013469_Archer AX55_UG_REV4.0.0.pdf
Did you set up the Access Point per Section 4.4 per physically numbered Page 18?
Are you able to use a
browser and directly login into the Access Point via the static IP address that you assigned to the Access Point - if that was indeed done. (As a router, the default IP address is 192.168.0.1 per Page 96 of the User Manual.)
Many manufacturers sort of "force" web based management via the manufacturer's website. You can manage routers, etc. directly on your network using a browser, the device's IP address, and the applicable login name and password. Resetting the device will return the device to its original default login and password values. And the reset device will lose other end user configuration settings that will also return to factory defaults.
What IP address was assigned to the Access Point?
If the ISP Router/Gateway is 192.168.1.1 then I would assign Static IP 192.168.1.2 to the access point provided that no other device is using that IP address. And the NAS would likely be Static IP 192.168.1.3 - end users can establish their own schemes to some extent.
And if different network devies are making use of the Media Player I would likely configure the Media Player with a Static IP address as well. Likely 192.168.1.4 with all devices using subnet mask 255.255.255.0.
Then allow the router to use some specific range of addresses for DHCP: perhaps 192.168.1.10-19 allowing for 10 wireless network devices.
Physical connectivity.
What respective ports on the Access Point are being used for the PC, NAS, and Media Player?
There are 5 ports: one blue and four yellow orange. What ports are in use and how are those ports configured?
As I understand your connections I would expect that the 100 foot Ethernet cable would run from a LAN port on the ISP router to a LAN port on the Access Point.
Regarding that Cat6 cable: what is printed along the cable(s) length? Cable should be round, 4 pairs, UTP, AWG 22-24, pure copper.
Not flat, not copper coated aluminum, not 26 AWG.... Cable source?
Overall, my thought is that there is a misconfiguration via error of omission or commission.
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I always encourage the use of a network diagram to help folks understand their networks.
You can easily sketch out the network starting with the devices and the port connections between devices.
Then add in device information: make, model, function, IP address (Static or DHCP), and MAC.
Use the diagram on Page 18 (Access Point mode) as a starting template. Note that "Internet LAN" is the Router (Gateway).
Your diagram would show the three cable connections from the Access Point to PC, NAS, and Media Player. In the manual note the listed port speeds....
Agree: it is indeed a lot. However, if you take a few minutes to work through the User Manual I think you will find that a bit more of it all makes sense.