I use different SSIDs so I can spot which WiFi network is troublesome, etc.
2. Never found a "split DHCP." For over a decade I setup the second router as a WAP (how is on google) and connect the Ethernet to one of the LAN ports of the second router.. And I'm done. I have never tried what you note about IP ranges. Why is this being done?
I describe the setup below - here are my questions.
Question 1) should I use a different SSID on the main and AP routers.
Question 2) Is the split DHCP a concern to anyone? Why?
The ISP modem/router is located in the basement due to wiring.
I upgraded to 25 speed and purchased a new modem from the ISP. I was told it had a 5Ghz wireless feature. On the first floor the 2.4 Ghz band is saturated. Neighbours use boosters too. (University town)
The new N router is serving 2.4 Ghz in the basement.
I added a 5 Ghz router on the main floor according to these instructions;
The 5 Ghz router is a D-Link 816L AC750
I set up the 5G with a wired connection on a LAN port (not the WAN port) It has a fixed address of 192.168.1.2 (The 2.4G router in the basement is 192.168.1.1)
Both routers have the same subnet name and password.
For redundancy, I set the DHCP as a split range.
The 2.4G serves 192.168.1.10-99 and the 5G serves 192.168.1.100-199 (note the 5G address is excluded)
They both use the full range as their subnet. 192.168.1.x 255.255.255.0
The students are reporting inconsistent access on the first floor. Their equipment works fine for a few days and then reports limited or no connectivitiy for a few days.
In case the DHCP was the issue, I turned off the DHCP server on the 5Ghz. The students reported consistent no connectivity with no local DHCP.
I ran NDT (Network Diagnostic Tool from internet2) from my phone and it reports no duplex errors.