ASUS AC1900 and RADIUS server issues

[Scrabble]

Hello SNB forums. I am hoping someone can help me with this problem I have been facing for the past few weeks.

For clarity's sake, here is an unprofessional diagram of our office network:

Spoiler: Network Diagram

(20-25 users average, 25-30 at peak times)

Our current setup uses an old, consumer grade Linksys WiFi router as an access point with WPA2 PSK. Clearly it was not designed for this kind of traffic. The range is terrible and there are often slowdowns throughout the day.

My goal was to switch out this old router with a ASUS AC1900. I also wanted to have it setup with WPA Enterprise using a RADIUS server on our Synology DS214.

Steps I took to accomplish this:
1. Installed RADIUS server on Synology DS214
2. Connected ASUS AC1900 to switch and configured it to Access Point Mode
3. Configured ASUS AC 1900 with WPA Enterprise using the secret key created by the RADIUS server on the Synology
4. Successfully connected to new WiFi network using credentials set up on the Synology

It worked perfectly! Speeds nearly doubled from the previous router and the range was far greater.
As soon as I felt confident in this setup, I disconnected the old Linksys router and added people to the new WiFi one by one.

Soon after doing this, the network died. The WiFi began to slow down and eventually dropped everyone. Those hardwired directly to the switch also lost connection. (Huh?)

There are a lot of parts working together here and I am having trouble narrowing it down. I feel like i am missing something obvious. I would really appreciate any advice!

 

[degrub]

Hello SNB forums. I am hoping someone can help me with this problem I have been facing for the past few weeks.

For clarity's sake, here is an unprofessional diagram of our office network:

Spoiler: Network Diagram

View attachment 8111

(20-25 users average, 25-30 at peak times)

Our current setup uses an old, consumer grade Linksys WiFi router as an access point with WPA2 PSK. Clearly it was not designed for this kind of traffic. The range is terrible and there are often slowdowns throughout the day.

My goal was to switch out this old router with a ASUS AC1900. I also wanted to have it setup with WPA Enterprise using a RADIUS server on our Synology DS214.

Steps I took to accomplish this:
1. Installed RADIUS server on Synology DS214
2. Connected ASUS AC1900 to switch and configured it to Access Point Mode
3. Configured ASUS AC 1900 with WPA Enterprise using the secret key created by the RADIUS server on the Synology
4. Successfully connected to new WiFi network using credentials set up on the Synology

It worked perfectly! Speeds nearly doubled from the previous router and the range was far greater.
As soon as I felt confident in this setup, I disconnected the old Linksys router and added people to the new WiFi one by one.

Soon after doing this, the network died. The WiFi began to slow down and eventually dropped everyone. Those hardwired directly to the switch also lost connection. (Huh?)

There are a lot of parts working together here and I am having trouble narrowing it down. I feel like i am missing something obvious. I would really appreciate any advice!

Sounds like one of the boxes got too busy or there were too many collisions. Who is doing the routing ?
what is the backbone nameplate bandwidth ? what is the actual throughput ? Your linksys may have been an unrecognized throttle preventing the switch or other devices from being overloaded.
is the switch managed or passive ?
Is the radius authentication the bottleneck ?
Start by turning off radius authentication.
Verify your wired and wireless are working as needed.
review the system logs for clues on all of the boxes.

Consider adding several access points, turn off wifi in the Asus and perhaps add a managed switch to connect the NAS and the users instead of putting everything into one box. Then leave the Asus to route to the web/firewall and let the switch handle the local network.