I believe I have some suggestions that can help you with this problem you’re facing. From the second screenshot that you posted, I noticed that the WAN IP address listed by your ASUS router is 192.168.0.11. This address is in the range that most Routers designate to devices on system, meaning I believe that the “Modem” you have from your Internet Service Provider (referred to as ISP from here onwards) is actually a “Modem/Router Combo” unit and this is why you are experiencing problems finding your Core. The ISP Modem/Router Combo you have is assigning an IP address for your devices when it should be the Asus Router that assigns these addresses. Just to make sure I have your network topology correct, I am transcribing it again below, please let me know if I am mistaken.
Modem/Router Combo from Internet Provider -> Lan Switch (wired)
Lan Switch -> Macbook (wired)
Lan Switch -> Asus Router (wired) -> iPad/iPhone (wireless)
In this setup, the Asus Router handles the IP addresses for wireless devices (such as the iPad/iPhone) while the Modem/Router Combo is handling anything that is connected to the LAN Switch and this is why communication is not possible.
There are two possible solutions here:
- You reconfigure your network to have this setup:
Modem/Router Combo from Internet Provider -> Asus Router
Asus Router -> LAN Switch (wired) -> Macbook (wired)
Asus Router -> iPad/iPhone (wireless)
Notes: The Asus Router should have 4 LAN out ports on the back of it, you can connect your LAN switch to one of those. If the Asus Router cannot reach the iPad/iPhone because it is on a different floor of your house, I would suggest an Access Point (Note: An access point is not the same thing as a Router since an access point lets the router handle IP addresses)
- You let the Modem/Router from your ISP completly handle the IP address assignment. For this step to work, you would need to disable DHCP on your Asus Router and confirm that the Modem/Router Combo has the DHCP settings set up correctly. That setting is probably listed under the “LAN” advanced settings page but cannot be sure since I do not have an Asus Router.
To perform my second suggestion, you will need to find a page similar to this one and switch the Asus Router from “Wireless Router Mode” into "Access Point Mode:
I would try the first option before considering the second one because if you make a mistake in your router settings, you may need to factory restore it to get it operational again, but the second solution will require no physical changes
Note: Please make sure to Reboot both your Asus Router and ISP provided Modem/Router after making these changes
I hope that this was a comprehensive enough answer but if you require help with anything I mentioned, please just let me know!