Cisco DPC3825 slow, re-boot =OK?

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I Plan to Stick Around
Posts: 8

Cisco DPC3825 slow, re-boot =OK?

Upgraded to 80GB Express, changed to the Hitron CDE-30364 modem but had big problems port forwarding so switched to the older DPC3825.

 

Got it all configured but every couple of days the speed slows to a crawl (10 Mbps up), I re-boot the modem by pulling the power and it's back to 30+.  Went away for a week and it was down to 0.57 Mbps up!  

 

It's on the desktop hardwired to it, wireless connections are the same.  I'm using it as a "gateway", ie: modem and router in one. I see others bridging it and using router for wireless but that's not my issue.

 

I've replaced the unit twice and spent hours with tech support, they ping it and find nothing.  They wanted to send tech support but I doubt they'll find anything, I've triple checked all the connectors, cables etc. and all is good.

 

Any ideas?

 

 

***edited labels***

Retired Moderator RogersShaan
Retired Moderator
Posts: 52

Re: Cisco DPC3825 slow, re-boot =OK?

Any of our members would like to add some input into this.

Resident Expert
Resident Expert
Posts: 13,884

Re: Cisco DPC3825 slow, re-boot =OK?

Is there any rhyme or reason to the slowdowns... specific time of day, etc?



I Plan to Stick Around
Posts: 8

Re: Cisco DPC3825 slow, re-boot =OK?

Thanks for the replys.

 

Doesn't seem to any particular time of day, or after doing a bunch of downloading etc.

 

Just  that every 3-4 days things slow to a crawl (10 Mbps or less d/l), I reset the gateway/modem and right back to 30+.  

 

Here's a copy of my DOCSIS log:

 

http://gallery.intlwaters.com/albums/userpics/10068/DOCSIS_Log.JPG

 

http://gallery.intlwaters.com/albums/userpics/10068/DOCSIS_Log2.JPG

 

http://gallery.intlwaters.com/albums/userpics/10068/DOCSIS_Log3.JPG

 

Seem to be getting a lot of that "Started Unicast Maintenance Ranging - No Response received - ..." is this normal?

 

You can see where I re-booted the modem on March 4, 8, 12, 16, 19, 23, 28 (away for a week), Apr. 5, 8.

 

Maybe I should re-boot it with a steel toe? Smiley Surprised

 

 

Resident Expert
Resident Expert
Posts: 13,884

Re: Cisco DPC3825 slow, re-boot =OK?

The unicast message.. is fairly normal
(well.. i guess it shouldnt be normal) that my SMC gets the same messages... but i DONT have the issue.

 

Normally.. i would say MODEM.. but you said you have swapped it..

If it was back end.. i reboot on your end, really wouldnt help it then..

Only thing i can think.. is that the firmware on the modem maybe in general, at its current itteration, is flakey in that sense?



I Plan to Stick Around
Posts: 124

Re: Cisco DPC3825 slow, re-boot =OK?

I had the same issue a while back where my CGN2 in bridge mode would slow to a crawl then a reboot would fix it for a while. At that time it was an issue with the rogers network in my area. The routes(internet paths) kept changing and seemed to leave open connections on the modem/router. That could be your issue. Record traceroutes when the service is good and the service is bad and compare that path taken on the rogers network. 

 

I have also read of a capacitance condition of the cable feed itself causing similar issues. The line will gradually build up a small capacitance charge and the reboot (or a disconnect of the cable from the modem) will discharge it. You would need a skilled tech on site to diagnose thise condition though.

I Plan to Stick Around
Posts: 8

Re: Cisco DPC3825 slow, re-boot =OK?

Thanks for the reply, good to hear from someone that had the same issues.

 

It slowed to 2.57 up this am 3 days after the last re-boot, forgot to try your suggestions before re-booting but definately will next time and report back.

 

How do you "record trace routes"?

Resident Expert
Resident Expert
Posts: 13,884

Re: Cisco DPC3825 slow, re-boot =OK?

to do a traceroute..

 

Open up a DOS prompt on your PC

 

type in

 

tracert

 

followed by a space then address of the site which is going slow.. EG:  www.google.ca

 

it will give you a trace of the path of servers/nodes it takes to get from A to B.

 

if you right click on the dos window, select MARK

you then can highlight all the information, then right click again.
this COPYS the information.

You then can paste into a text file.

 



I Plan to Stick Around
Posts: 8

Re: Cisco DPC3825 slow, re-boot =OK?

Great, thanks, here's a current trace:

 

Microsoft Windows [Version 6.1.7600]

Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

 

C:\Users\Owner>tracert www.google.ca

 

Tracing route to www.google.ca [74.125.226.127]

over a maximum of 30 hops:

 

  1     *        *        *     Request timed out.

  2    10 ms    16 ms     8 ms  209.148.242.221

  3     7 ms     8 ms    14 ms  69.63.249.62

  4     9 ms    14 ms     8 ms  209.148.224.246

  5     8 ms    10 ms     9 ms  72.14.222.87

  6    14 ms    16 ms     8 ms  216.239.47.114

  7    12 ms     8 ms    13 ms  209.85.250.207

  8    10 ms     8 ms     8 ms  yyz08s13-in-f31.1e100.net [74.125.226.127]

 

Trace complete.

 

C:\Users\Owner>

Resident Expert
Resident Expert
Posts: 13,884

Re: Cisco DPC3825 slow, re-boot =OK?

That looks fairly good.
Was that durring a GOOD time?