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Can you log into the modem and check the firmware version that is listed on the Status page, which is the first page that comes up when you log in. The latest version is 4.2.4.5 I suspect that you might have 4.2.4.3 loaded. If that is the case, it has a firmware bug that throttles down the throughput of the CGN3 port that is connected with a 10 / 100 Mb/s device or cable. Usually it will throttle down to 35 Mb/s, so this is a bit perplexing. If you look at the back of the CGN3, the port color will be amber for 1 Gb/s interconnect rate, and green for 10 / 100 Mb/s. If the port LED is amber, it will give you the full data rate. If the port LED is green, the throughput is throttled down. If you do have 4.2.4.3 loaded, the next version should be pushed out in 48 hours, but I would give it 3 or 4 days. After 48 hours and no update, you can call tech support and ask the CSR to have it pushed out to the modem.
Can you expand on the term AEBS ? Airport Extreme Base Station by chance. And can you check the ethernet cable that connects the two and confirm that it is a Cat 5e or Cat 6 cable?
Edit: If you have Firmware Version 4.2.4.3 loaded, have a look at msg #134 on the following page for a summary of the issues with that version:
Firmware version 4.2.4.5 resolves the issue of port throttling.
Ok, can you confirm if the connected port LED at the back of the CGN3 is amber or green. When you run a test through the Base Station, is that a wired or wireless test?
You should be connected to the bottom port of the CGN3 when running in Bridge mode.
The light for the smart home will be green, its only a 10/100.
https://www.apple.com/ca/airport-extreme/specs/
This is the unit you have?
IF the unit is bridged.. i would think it should work.. it has gigabit ports, etc.. so shouldn't be that.
Your connecting DIRECT to the CGN3, shows that it outputing speed fine..
SOMETHING on the AEBS is not talking right to it...
Let me think on it.
For test purposes, can you try the following. I'm assuming that the CGN3 is still in bridge mode. Disconnect the Smart Home Monitoring router and restart the CGN3 by unplugging from the socket and plugging it back in, with just the base station connected. I don't think that this should do anything, but I remember a comment from of of the Rogers Mods recently who indicated that the CGN3 can become flakey if two ports are used when the CGN3 is in bridge mode. If that turns out to be the case, just plug the Home Monitoring router into your base station. Now the interesting thing here is that you would normally turn off the DHCP server on a router if you had it plugged into another router or modem, but in the case of the Home Monitoring router, you won't have that option. That might require a discussion with tech support to see what IP address range the Netgear (?) router uses, so that you can adjust the LAN IP range of the base station if necessary.
Can you confirm that when you indicated "Smart Home Monitoring" that refers to the Netgear router?
Edit: The cables that you use to connect all devices should be gigabit capable, ie. recent Cat 5e or Cat 6 cables. People do have "Fast Ethernet" cables kicking around that were purchased not so very long ago. Those cables only support a maximum of 100 Mb/s. I wonder if that might be the case here, with the one cable limiting the throughput. If you disconnected that cable at the base station and simply plugged it into the CGN3, the CGN3 port LED will tell you if the cable supports 1 Gb/s (amber) or 10/100 mb/s (green).
Have a look at my edit above. Its possible that the cable is damaged in some fashion or that it isn't connecting properly at one or both ends. The CGN3 port LED would tell you right away if that cable now only supports 100 Mb/s
