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Bridging questions

I Plan to Stick Around

I have the Cisco DPC3825 Gateway, and have it bridged. All my PC's and devices in the house are wired connected. I have switches to accommodate the extra inputs that I need. For the past few weeks, service has been dropping frequently - sometimes for only a few minutes; sometimes, like last night for an hour or so.


Last night I called Rogers tech just to see if there was something going on in my neighbourhood which would cause these outages. The tech said that my line strength was a bit off, but not enough to cause the outages. He proposed pushing a firmware update to the gateway. He also mentioned that the router was more likely the problem.


Here are my questions:


1. Is there really anything to be gained by bridging the gateway if I am not using wireless connections? It seems the discussions here about the advantages of bridging center around the wireless weaknesses with the gateways.


2. Has anyone had any experience with these firmware pushes? I'm concerned that I could be worse off than I am now after it is done.


thank you.




***edited labels***


Re: Bridging questions

I Plan to Stick Around
Yes. But that would wipe out the data ... Hmmm. Seems to me to be a no win situation. Until they (Hitron) fix the firmware to be able to log into the modem without having to reset back to defaults then I am never going to be able to narrow down this problem! Thanks all the same... I will just muddle along for now.

Re: Bridging questions

You could call tech support and have the CSR look at the signal levels.  The measurement method is different, but the CSR should be able to access the data without any problems and see if there is a signal issue. 


Or....since the modem is bridged, you have to assume that any signal problem that is present now will still be present after a reboot.  Yes, it might be slightly different as a reconnect does change or alter the voltage levels, but the assumption should be that any real problem will still be present.  So, with that, the easy way to do this is to turn of or disconnect the router, and disconnect a pc or laptop that you have connected to the router and plug it into the modem.  Reset the modem by depressing the recessed reset button for 30 seconds and let it reboot back into Gateway mode.  When its there, log in, copy the downstream and upstream tables from the DOCSIS WAN page and paste them here or into a temporary doc like a notepad page.  Once you have that, navigate to the STATUS....CAPABILITY tab and deselect the Residential Gateway Function.  Hit apply and it will or should reboot back into Bridge mode.  Disconnect the pc or laptop at the same time and reconnect to the router.  Turn on or reconnect the router to the modem as well.  When everything is up and running log back here and paste the tables.  Hopefully that will take you less than 5 minutes.   

Re: Bridging questions

I Plan to Stick Around

OK  thanks for the suggestion.  I will try that tonight after I get back from work.   I have also gained a lot of insight by reading the fourms here.. on other little things. BTW who is CSR?

Re: Bridging questions

@baffledalot wrote:

 BTW who is CSR?

Customer Service Representative, i.e. the people at Rogers who answer the phones...

Bridging Questions

I Plan to Stick Around
I have a few questions about bridging a 3rd party router as it seems to be the only way I can play games on my xbox. If I put the CGN3ACSMR into bridge mode will others still be able to use that wireless? And will it affect its performance?

Thanks and sorry for the dumb question

Re: Bridging Questions

Hi.  No such thing as a dumb question.  A dumb answer, maybe.... 🙂   When you bridge the modem, you are placing it in a "modem only" mode of operation, where it only provides a bridge between the Rogers cable system and the house Local Area Network.  All functions including router and wifi functions are disabled.  That requires you to have your own router to handle all of the firewall, router, port forwarding, wifi duties, etc.  The modem does not provide any firewall capability when its operating in Bridge mode.  Hope this helps.

Re: Bridging Questions

I Plan to Stick Around
Thank you that is exactly what I am looking for! Appreciate the help

Re: Bridging questions

I'm Here A Lot

Hello I have a Cisco DPC3825 Gateway, and have it in bridged mode. I have my PC connected and a 3rd party router for the wifi connected as well. For the past few weeks, service has either been perfectly fine, dropping occassionally for 1-10 minutes or constantly (6-10 times a day for the amount of time described above). I've had techs here in the past and they've ran new wires inside and to the box but this issue continues to persist. I've exchanged modems a few times but this issue seems to persist. 


My issue closely resembles what is described in another thread


However my settings look quite different


Model:     Cisco DPC3825
Vendor:     Cisco
Hardware Revision:     1.0
Serial Number:    xxxxxxxxx
MAC Address:     xx:xx:xx:xx:xx:xx
Bootloader Revision:     2.3.0_R3
Current Software Revision:     dpc3825-v302r125572-131113a-ROG
Firmware Name:     dpc3825-v302r125572-131113a-ROG.bin
Firmware Build Time:     Nov 13 15:51:58 2013
Cable Modem Status:     Operational
Wireless Network:    Disable


Cable Modem State           
DOCSIS Downstream Scanning:     *Completed*
DOCSIS Ranging:     *Completed*
DOCSIS DHCP:     *Completed*
DOCSIS TFTP:     *Completed*
DOCSIS Data Reg Complete:     *Completed*
DOCSIS Privacy:     *Enabled*


Downstream Channels           
      Power Level:     Signal to Noise Ratio:
Channel 1:     -0.2 dBmV     39.9 dB
Channel 2:     -0.4 dBmV     39.9 dB
Channel 3:     -0.3 dBmV     39.9 dB
Channel 4:     -0.8 dBmV     39.6 dB
Channel 5:     -1.0 dBmV     39.5 dB
Channel 6:    -0.7 dBmV     39.7 dB
Channel 7:     -0.5 dBmV     39.5 dB
Channel 8:     -1.3 dBmV     39.5 dB


Upstream Channels           
      Power Level:
Channel 1:     46.7 dBmV
Channel 2:     45.0 dBmV
Channel 3:     45.5 dBmV
Channel 4:     0.0 dBmV


I have no clue what any of this means, so I would be grateful to anyone that can tell me if it points to something wrong.



Re: Bridging questions

Most other posts you will see more often now, are with the newer modems.  24 channel ones.

Shouldnt be a big deal though.

Generally, you want your signal to be as close to 0 as possible, in the +/- 10 range.
So yours is not too bad.

I DOUBT its the problem.
Unless you are able to log in and check it, durring those DOWN times.. to see if there is any difference.

May be something else more external.. a node further down the line, etc.. which keeps going out.

Re: Bridging questions

Thanks, when I was looking through my DOCSIS Log I've been seeing a lot of 


"No Ranging Response received - T3 time-out;CM-MAC=00:23:be:e0:fa:51;CMTS-MAC=00:14:f1:e5:89:cd;CM-QOS=1.0;CM-VER=3.0;" 


This error has happened 39 times and has time not established. The strange thing is certain services like Skype and Steam friendslist stay functioning, but everything including being able to check the modem are knocked out for a brief period. I first thought this could be a DNS issue but i'm using OpenDNS as my main and Google DNS as my alternate so I doubt both are going down. Looking through other threads its beginning to look like intermittent disconnects.


Any help would be greatly appreciated



Re: Bridging questions

You have some type of issue on the upstream side of the communications between the modem and the Cable Modem Termination System.  The problem might not necessarily be with your modem or cabling, it might be with the node that the modem connects to.  If you notice a period where you lose internet service, or service with your Rogers Cable TV or Home Phone, call tech support and ask them to check the modems and the node as well.  The best time to call is when the problem is in progress, so put Rogers on speed dial, and call in as often as you need to.  Rogers Contact Number 1-888-764-3771  Here's a link with simplified explanation's of the timeout messages:

Re: Bridging questions

Thanks, if it was a node issue how is that fixed ?

Re: Bridging questions

Tech support has remote sensing and reset capabilities for the nodes but I don't know how far those capabilities extend.  If there is a serious issue, then a tech will have to be sent to check the node and determine what the problem is.


Your upstream power levels aren't terribly bad.  They are elevated but shouldn't be causing a real problem just yet.  But, there is something going on if you are seeing a series of T3 timeouts and seeing periods of no internet service.

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