Modem Help for Dummy

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Hoping someone can help me troubleshoot (limited knowledge on my end so I'm trying to learn). We have optimum for a basic cable package and internet. Message on the bill last month that modem rental fee is going to kick in, $5 a month. In addition I'm getting a "free" upgrade to Optimum 60. Decided to try to buy my own modem route. So, after doing some reading online it seems like one of the recommended modems for Optimum is the ARRIS SB6183. Order one off Amazon. Directions to set up read basically plug in coaxial cable, plug in ethernet, plug in power, might have to register with your service provider (Optimum automatically prompts you and that seems to have went fine). All that's done I have internet but initial load on web pages seems painfully slow compared to what I was used to with the old modem.

I ran (what I'm pretty sure is) a basic speed test and it seems okay:


How would I go about troubleshooting/testing or what could i have done wrong?
 
Originally Posted By: Quattro Pete
Try running this test:
http://www.dslreports.com/speedtest




Originally Posted By: Quattro Pete
But I agree, latency seems rather high.

Do you have a router sitting behind this modem? Is it configured properly?

Do you just mean is there a router in the mix?

Coaxial --> Modem --> Router --> Computer(s) is the setup, but for the above test I unplugged the router. I didn't change anything regarding the router when I plugged in the new modem.

Also I ran the initial quick speed test with the old modem when I was first messing around with the setup:

(No idea what is driving the differences in the speeds, and I only tested once - I only wanted to mention this because of the latency comment.)
 
The bufferbloat is high, and might be causing the percieved lag. IF your request has to wait through a fat buffer in the modem you can have quite a delay. Before I set up my router to counter the modem buffer while uploading a large file my ping would be 2.5 seconds. After countermeasures ping was 250ms during the same large upload..


My bufferbloat is A due to my QoS at the router. Nothing super complicated, Im just limiting my top speeds to 22mbps/1.5mbps instead of my rated 24/2. The modem can never recieve more data than it can send, so its buffer is empty.
 
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As others have said, your latency seems high. Since you eliminated the router from the picture when you ran the test, and both modems show similar latency, I'm guessing it may be ISP-related.

My latency isn't fantastic, but all my traffic runs through a Firepower filter module as well as the integrated firewall, so in that respect it really isn't that bad. You've got none of those things in play, yet have significantly higher latency.

19565696.png
 
Originally Posted By: Merkava_4
Send the Arris back and get a Motorola MG7550.


Why? The 6183 is a highly regarded modem. If it was a 6190, then sure, but the 6183 is a solid modem.

Hey, OP, can you run a tracert from the command line?

>tracert 4.2.2.2

Also, can you post your modem signals? Browse to http://192.168.100.1
You should see a table with Downstream and Upstream bonded channel info.
 
Originally Posted By: 99Saturn
Also I ran the initial quick speed test with the old modem when I was first messing around with the setup:


So, if you switch back to the old modem, all your pages start loading quickly again, despite both modems showing similar (and high) latency? That's strange, indeed. I guess maybe it's not latency but something else that is causing your issues. Maybe your ISP needs to flash your new modem with their own firmware that was specifically written for their service?
 
Originally Posted By: Quattro Pete
Originally Posted By: 99Saturn
Also I ran the initial quick speed test with the old modem when I was first messing around with the setup:


So, if you switch back to the old modem, all your pages start loading quickly again, despite both modems showing similar (and high) latency? That's strange, indeed. I guess maybe it's not latency but something else that is causing your issues. Maybe your ISP needs to flash your new modem with their own firmware that was specifically written for their service?




I at least did not have the slow load time prior to the new modem. I didn't spend much time once I re-hooked the old modem, I just wanted to compare that speed test.
 
One thing you might try is to reset the modem (there should be an option to do that somewhere in that 192.168 link I posted above). That will force it to pull the config again.
 
Originally Posted By: cpayne5
One thing you might try is to reset the modem (there should be an option to do that somewhere in that 192.168 link I posted above). That will force it to pull the config again.


Good suggestion, though with the tests using both modems exhibiting similar latency, I still find that strange.

Also, he hasn't posted a response to your traceroute request yet either, would be interesting to see what that yields.

OP, for the sake of being overly thorough, do you have another computer you can run the test from?
 
Originally Posted By: cpayne5
One thing you might try is to reset the modem (there should be an option to do that somewhere in that 192.168 link I posted above). That will force it to pull the config again.


Thanks I will take a look for that tonight, I'll also post the signals and tracert results once I run it, just won't be home until late today.

Overkill - I do have another computer. You suggesting to run the speed test QP posted the link to above from that one as well?
 
Another suggestion would be to change your isp dns server to a public dns server like Google or Opendns to see if that helps. For comparison I changed mine to Googledns and my latency(ping) improved by 5ms

 
Originally Posted By: cpayne5
Hey, OP, can you run a tracert from the command line?

>tracert 4.2.2.2

Also, can you post your modem signals? Browse to http://192.168.100.1
You should see a table with Downstream and Upstream bonded channel info.




Let me know I can screenshot it instead:

Startup Procedure
Procedure Status Comment
Acquire Downstream Channel Locked
Connectivity State OK Operational
Boot State OK Operational
Configuration File OK
Security Enabled BPI+
DOCSIS Network Access Enabled Allowed

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Corrected Uncorrectables
1 Locked QAM256 2 609000000 Hz -5.9 dBmV 40.1 dB 0 0
2 Locked QAM256 1 603000000 Hz -5.8 dBmV 40.1 dB 0 0
3 Locked QAM256 3 615000000 Hz -6.0 dBmV 40.0 dB 0 0
4 Locked QAM256 4 621000000 Hz -6.0 dBmV 40.0 dB 0 0
5 Locked QAM256 5 627000000 Hz -5.9 dBmV 40.1 dB 0 0
6 Locked QAM256 6 633000000 Hz -5.8 dBmV 40.1 dB 0 0
7 Locked QAM256 7 639000000 Hz -5.9 dBmV 40.0 dB 0 0
8 Locked QAM256 8 645000000 Hz -5.8 dBmV 40.1 dB 0 0
9 Locked QAM256 9 651000000 Hz -6.0 dBmV 39.9 dB 0 0
10 Locked QAM256 10 657000000 Hz -6.0 dBmV 39.9 dB 0 0
11 Locked QAM256 11 663000000 Hz -6.0 dBmV 39.9 dB 0 0
12 Locked QAM256 12 669000000 Hz -5.9 dBmV 39.9 dB 0 0
13 Locked QAM256 13 675000000 Hz -5.9 dBmV 39.4 dB 0 0
14 Locked QAM256 14 681000000 Hz -5.8 dBmV 39.9 dB 0 0
15 Locked QAM256 15 687000000 Hz -5.7 dBmV 39.9 dB 0 0
16 Locked QAM256 16 693000000 Hz -5.7 dBmV 39.9 dB 0 0

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 65 5120 Ksym/sec 28400000 Hz 49.0 dBmV
2 Locked ATDMA 64 5120 Ksym/sec 35000000 Hz 49.8 dBmV
3 Locked ATDMA 66 5120 Ksym/sec 22000000 Hz 48.3 dBmV
4 Locked ATDMA 67 5120 Ksym/sec 14000000 Hz 47.3 dBmV
 
Originally Posted By: OVERKILL
Originally Posted By: cpayne5
One thing you might try is to reset the modem (there should be an option to do that somewhere in that 192.168 link I posted above). That will force it to pull the config again.


Good suggestion, though with the tests using both modems exhibiting similar latency, I still find that strange.

Also, he hasn't posted a response to your traceroute request yet either, would be interesting to see what that yields.

OP, for the sake of being overly thorough, do you have another computer you can run the test from?


I find this hard to believe but it seems like I don't have a reset option. Directions here:

http://arris.force.com/consumers/article...=RelatedArticle

My screen looks like this:


Ironically pages seem to be loading fast at this very minute. They weren't 2 hours ago or so.

And these are from the other PC, ethernet directly connected from the modem.





Lastly, when connected through the router - specifically noticed the latency based on the comments thus far.



 
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Just to confirm, the last two, with the improved latency, are with the router in the mix and the poorer results are from without?
 
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