CGN3 not issuing ipaddress when bridged

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I Plan to Stick Around
Posts: 15

CGN3 not issuing ipaddress when bridged

I have been running a CGN3 in bridge mode for a number of years now without any issues. Solid connections and no outtages --  last week, my internet went out, and i determined that my router was not reciving an IP address from the CGN3 -- after many reboots of both the modem and the router, and many resets of the router, i felt the router was broken -- 

 

i reset the CGN3 to router mode and this worked -- although its a little flakey and unstable (speed flucuations and wifi drops). 

 

I purchased a new router this weekend, and reset the modem to bridgemode -- and found that it is again not issueing an ipaddress to the router.

 

 

As this is a brand new router with the same issue --  could this be a modem/bridgemode  problem? Should i replace my modem or just deal with it?

 

 

 

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Retired Moderator RogersPrasana
Retired Moderator
Posts: 624

Re: CGN3 not issuing ipaddress when bridged

Hi @bdoyledimou

 

Thank you for your post. 

 

Are you able to obtain an IP address when your CGN3 is running on its own and directly connected?

 

You can swap your rental device at any of your closest Rogers Plus locations.

 

 

@RogersPrasana

Resident Expert
Resident Expert
Posts: 6,026

Re: CGN3 not issuing ipaddress when bridged

Swapping the modem is a good idea.  Before you do that, can you log into the modem, navigate to the STATUS.... DOCSIS WAN page, copy the downstream and upstream tables and paste them into the thread.  Those are the cable signal levels and signal to noise ratios which might be worth looking at, just to be sure that there isn't some cable problem that is the real cause of the problems you are having.



I Plan to Stick Around
Posts: 15

Re: CGN3 not issuing ipaddress when bridged

Here i my details...

Downstream Overview
Port IDFrequency (MHz)ModulationSignal strength (dBmV)Signal noise ratio (dB)Channel ID
1657000000256QAM-2.00037.63611
2591000000256QAM-1.50038.6051
3597000000256QAM-1.80038.9832
4603000000256QAM-1.80038.9833
5609000000256QAM-1.50038.6054
6615000000256QAM-1.30038.9835
7621000000256QAM-1.30038.9836
8633000000256QAM-1.70037.6367
9639000000256QAM-1.40038.6058
10645000000256QAM-1.40038.6059
11651000000256QAM-1.90037.63610
12663000000256QAM-1.80037.35612
13669000000256QAM-1.40037.63613
14675000000256QAM-1.50037.63614
15681000000256QAM-2.10037.63615
16687000000256QAM-2.60037.35616
17693000000256QAM-2.50037.35617
18699000000256QAM-2.20037.35618
19705000000256QAM-1.90038.60519
20711000000256QAM-2.20037.63620
Upstream Overview
Port IDFrequency (MHz)BandWidthModulation TypeSignal Strength (dBmV)Channel ID
1385960003200000ATDMA46.7505
2237000006400000ATDMA45.2507
3305960006400000ATDMA44.7506
I Plan to Stick Around
Posts: 15

Re: CGN3 not issuing ipaddress when bridged

Yes when i am in default factory reset mode it works -- but the wireless is unstable.

Resident Expert
Resident Expert
Posts: 6,026

Re: CGN3 not issuing ipaddress when bridged

Your signal levels aren't terribly bad, the upstream is creeping up from its normal 36 to 40 dBmV range, but those levels as a whole shouldn't be causing problems.  Is the router the only device connected to the modem with the modem in Bridge mode, and then everything else connects to the router?  What router did you purchase and what wifi networks do you normally use, 2.4 or 5 Ghz or both?  With a new router, I would run a reset of the modem, and then kick it back into Bridge mode, and then run a reset of the router which should cause it to pick up an IP address after the reboot.



I Plan to Stick Around
Posts: 15

Re: CGN3 not issuing ipaddress when bridged

I have been in bridge mode since i received this CGN3 -- about 2 years -- on Thanksgiving imy network went out , and i thought my router had died (ampedwireless 10000gr). I reset the CGN3 to factory default. It works - but wireless is not good and does not reach my office.

I purchased a TP-Link Archer C2 router to replace my Amped router. It worked for 24 hours -- then failed to get an ipaddress assigned and all internet functions ceased through the router. I again factory reset the CGN3 device and am currently working off of it.
Resident Expert
Resident Expert
Posts: 6,026

Re: CGN3 not issuing ipaddress when bridged

With the modem in Bridge mode I would try:

 

1.   A different port on the modem:

2.  If that has no effect, use a different Cat 5e or Cat 6 between the modem and router (one that you already know will work):

3.  If that has no effect, swap the modem.