I've opted not to embrace Glow Fiber. So, I decided to get a new cable modem to replace the slower and unsupported on that I've had for a long time. I tried to do the same thing in the spring but couldn't get the cable modem to connect.
This one connected and great throughput was obtained out of the cable modem when I did a few speed tests. Router 0 returned about the same numbers (400 mbps). Router 2 returned slower numbers (80 - 100 mbps). Router 3 and router 1 in back of a firewall returned slightly higher numbers (100 - 140 Mbps).
So why the variances in speed.
Router 0 is the newest and fastest.
Router 2 is an older router who has had a shareware image installed.
Router 1 is an older router used for connection to all the house gizmos (Alexa, thermostat, Ring cameras, TVs and a Nintendo Switch).
Router 3 is reserved for the Wi-Fi extender, tablets, phones and laptops.
The stated throughput for all the 5mhz channels are in excess of 300 mbps. Some are much higher. Speed on the wired connections between all the routers and the firewall a 1000 mbps.
Remediation activities
Made sure all the cables were the same cat type. Had a mixture of cat 5, 5e and 6. Went with all cat 6 connections.
Replaced the long cat 6 going to the firewall with another cat 6.
Verified a few settings in all the routers and nothing stood out.
Turned off network stats on all routers.
Isolated all the 2 mhz and 5mhz channels.
Turned off all 2 mhz channels excepts router 3's.
Testing and isolation exercises
Firewall speed tests all maxed out at 140 mbps. Stated throughput is 300 mbps. I was running two speed tests continuously. Observers CPU utilization approach 50/60 percent over these 5-minute windows.
Router 3 was plugged directly into the cable modem and unlike router 0 only delivered 170 mbps to 200 mbps through the 5mhz channel. No changing of any option changed the end results. I can't see any performance stats from these routers.
Suspected causers
The firewall is 13 to 15 years old and out of support.
Router 2 and router 1 are probably 10 years old and out of support.
Router 3 is probably 4 to 5 years old and supported.
Router 0 is probably 2 years old and supported.
I need to develop a matric with their serial numbers, in service date and support info. I suspect the older they are suggesting slower CPU and memory chips.
Next steps
Shut down and pull the network apart and record all the pertinent numbers.
Speed test all devices right out of the cable modem and record those numbers.
Put the network back together and speed test as I go along.
Analyze the results.
Concluding thoughts
I don't have a performance issue. It's just a consistency issue.
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