*** This post was last edited May 2, 2017 ***
Good morning Community,
As I mentioned in a post two days ago, we have received the next firmware 2.0.10.20 from Hitron. We are currently running initial testing on this version and will push it out to participants in the firmware trial program as soon as it passes initial testing.
However, while running these tests, we discovered abnormal behavior with ICMP and are awaiting feedback from Hitron today to asses how this will be addressed. As soon as I this is confirmed, I’ll update the change log with the correct version information and start pushing it out.
In parallel, we are still working on the following high priority items. In some cases below, I requested affected customers to reach out to me via private message. If you do so, please include your modem MAC address in the subject line (even if we exchange messages daily) as there are a lot of you reaching out to me daily 🙂
UDP Packet Loss
The investigation for what has been reported as UDP packet loss is still ongoing. We have deployed a probe at one fellow forum member on both a CODA-4582 and a CGNM-3552 to collect additional data. We are actively working with Hitron and Intel on the results observed.
Based on what we know so far, in most instances UDP packet loss is coupled with higher uplink usage in the area. Although the impact is noticeable in specific logs (League of Legends), the root cause for the perceivable impact (while playing) is likely related to bufferbloat (see next issue).
Bufferbloat
When comparing the performance of a CODA-4582 to a CGNM-3552 in the same network conditions, the CODA-4582 consistently reports higher bufferbloat when tested on DSLReports.
Update April 12: The solution for this problem will come in two folds. It will require a change in software which will possibly be included in 2.0.10.27 but more likely in 2.0.10.28 and a change in network configuration.
The network configuration change is not compatible with the current firmware so this change will only come after a vast majority of the modems are running the new code. We are however looking at a way to make the change only for specific modems to support testing in the community.
Update April 22: This problem seems resolved in firmware 2.0.10.27
5 GHz WiFi Low range for channels 36 to 48
Lower WiFi channels on the modem have a much smaller range. This is due in part to the limit imposed by Industry Canada to maximum transmit power.
Furthermore, the current automatic channel selection (auto mode) tends to select the lower channels when in similar load conditions.
Workaround: manually select higher channels (149-153-157-161)
Update April 22: The channel selection algorithm has been improved in firmware 2.0.10.27
Loss of OFDM Channel Lock
Under some RF conditions, the modem fails to lock properly on the OFDM channel. This typically result in variable performance.
Update April 12: This problem is resolved in 2.0.10.26T2
List of connected device does not get fully populated
This is a known issue that has been tracked since firmware 2.0.10.13. We are making improvements at every firmware but it is not a perfect system.
The situation is worst after a reboot or firmware upgrade as the list gets reset and must be repopulated as devices renew their DHCP lease.
NAT Loopback not working for wired clients
When setting up port forwarding to an internal server, it is possible for a client on WiFi to reach the server using the external IP/port. If the client is on a wired interface, it doesn't work.
Update April 12: This problem is resolved in 2.0.10.26T2 (not confirmed)
LAN Counters not working
Some customers reported that LAN counters (especially in bridge mode) are reporting inaccurate values.
This problem has been reported to Hitron for investigation.
Unexpected modem reboot
Some customers reported their modem reboots unexpectedly. We have also seen this behavior in our lab.
Update April 12: This problem is resolved in 2.0.10.26T2
Missing SC-QAM Channels
After a reboot, some modems are missing SC-QAM channels. A fix has been implemented in 2.0.10.26T2 to address this behavior but it has not corrected all scenarios.
Investigation continues with Hitron.
WiFi Survey
The WiFi Survey functionality in firmware 2.0.10.26T2 (and possibly before) reports incorrect SSID names.
Guest Network
When connecting to the Guest Network, an error message is displayed "only allow DHCP client to use this wireless". This has been reported in firmware 2.0.10.26T2.
Update April 22: This issue has been resolved in firmware 2.0.10.27
Update May 2: It seems this issue is not fully resolved and still experienced by some users
Future Planned Improvements
The following are items that we are working on in parallel of the above.
- Improvement in WiFi speeds
- Improvement in latency / bufferbloat
Dave
*Edited Labels*
- last edited on by
RogersCorey
@RogersDave Looking at this thread and notice some were saying IPv6 was active so I did a factory reset and a reboot and now my speeds have gone down quite a bit. 
http://ipv6-test.com/
Downstream Overview
| Port ID | Frequency (MHz) | Modulation | Signal strength (dBmV) | Channel ID | Signal noise ratio (dB) |
| 1 | 591000000 | 256QAM | 3.900 | 31 | 40.366 |
| 2 | 363000000 | 256QAM | 2.200 | 10 | 40.366 |
| 3 | 369000000 | 256QAM | 2.800 | 11 | 40.366 |
| 4 | 375000000 | 256QAM | 2.300 | 12 | 38.983 |
| 5 | 381000000 | 256QAM | 1.700 | 13 | 40.366 |
| 6 | 387000000 | 256QAM | 1.800 | 14 | 40.366 |
| 7 | 393000000 | 256QAM | 2.000 | 15 | 38.983 |
| 8 | 399000000 | 256QAM | 2.700 | 16 | 40.366 |
| 9 | 405000000 | 256QAM | 2.800 | 17 | 40.366 |
| 10 | 411000000 | 256QAM | 3.100 | 18 | 40.366 |
| 11 | 417000000 | 256QAM | 3.400 | 19 | 40.366 |
| 12 | 423000000 | 256QAM | 4.100 | 20 | 40.366 |
| 13 | 429000000 | 256QAM | 3.700 | 21 | 40.366 |
| 14 | 435000000 | 256QAM | 3.200 | 22 | 40.366 |
| 15 | 441000000 | 256QAM | 3.200 | 23 | 40.366 |
| 16 | 447000000 | 256QAM | 3.100 | 24 | 40.366 |
| 17 | 555000000 | 256QAM | 4.400 | 25 | 40.946 |
| 18 | 561000000 | 256QAM | 4.700 | 26 | 40.366 |
| 19 | 567000000 | 256QAM | 5.000 | 27 | 40.366 |
| 20 | 573000000 | 256QAM | 4.300 | 28 | 40.946 |
| 21 | 579000000 | 256QAM | 4.500 | 29 | 40.946 |
| 22 | 585000000 | 256QAM | 4.100 | 30 | 40.366 |
| 23 | 357000000 | 256QAM | 2.300 | 9 | 40.366 |
| 24 | 597000000 | 256QAM | 3.700 | 32 | 38.983 |
| 25 | 603000000 | 256QAM | 4.200 | 33 | 38.983 |
| 26 | 609000000 | 256QAM | 5.200 | 34 | 40.366 |
| 27 | 615000000 | 256QAM | 5.400 | 35 | 40.366 |
| 28 | 621000000 | 256QAM | 5.900 | 36 | 38.983 |
| 29 | 633000000 | 256QAM | 5.500 | 37 | 38.983 |
| 30 | 639000000 | 256QAM | 4.600 | 38 | 38.983 |
| 31 | 645000000 | 256QAM | 4.100 | 39 | 38.605 |
| 32 | 651000000 | 256QAM | 3.700 | 40 | 38.983 |
OFDM Downstream Overview
| Receiver | FFT type | Subcarr 0 Frequency(MHz) | PLC locked | NCP locked | MDC1 locked | PLC power(dBmv) |
| 0 | NA | NA | NO | NO | NO | NA |
| 1 | NA | NA | NO | NO | NO | NA |
Upstream Overview
| Port ID | Frequency (MHz) | Modulation | Signal strength (dBmV) | Channel ID | Bandwidth |
| 1 | 30596000 | ATDMA - 64QAM | 39.500 | 1 | 6400000 |
| 2 | 38596000 | ATDMA - 64QAM | 42.750 | 3 | 3200000 |
| 3 | 23700000 | ATDMA - 64QAM | 39.500 | 2 | 6400000 |
OFDM/OFDMA Overview
| Channel Index | State | lin Digital Att | Digital Att | BW (sc's*fft) | Report Power | Report Power1_6 | FFT Size |
| 0 | DISABLED | 0.5000 | 0.0000 | 0.0000 | -inf | -1.0000 | 4K |
| 1 | DISABLED | 0.5000 | 0.0000 | 0.0000 | -inf | -1.0000 | 4K |
@Telek wrote:
@Triple_Helix wrote:
@Triple_Helix wrote:Okay just upgraded to the Gigabit sevice so here are my first results!
Wired results!
@RogersDave I called Rogers tech support and they tweeked things on there end and things look much better since going to the Gigabit! Any Idea when DOCSIS 3.1 will be released in North Oshawa? This is wired of course.
if that's DOCSIS3.0 then stay there for as long as you can, haha! That's about the fastest that you'll see no matter what.
What did Rogers Tech support tweak to improve your speeds? Any idea?
Don't know as they didn't say but it did get better over the few minutes during the call.
@Triple_Helix unless you have already truncated the IPV6 address in your post, go in and delete all after:
1 1 ms <1 ms 1 ms hitronhub.home [2607: on the first trace line.
Otherwise, your IPV6 address will be hanging out in the wind so to speak.
@prateeck7 you were inquiring about DNS servers. I use OpenDNS for the purpose of web filtering for malware sites. If you sign up for a freebie account you can specifiy what filtering what want to use. There are a number of categories that I can't remember off the top of my head. Load an OpenDNS address updater on your pc, so that that OpenDNS knows what IPV4 address is in use from your house and any DNS queries are checked. Note that this is only for IPV4. IPV6 filtering services are not available as of yet from OpenDNS, although its been on their list for a few years now. OpenDNS does provide DNS service for IPV6 addressess and has done so for a considerable amount of time. At the present time, I'm not in a hurry to switch over to IPV6, just a matter of enabling IPV6 in my Asus router when the time comes although when necessary, I run modem test sessions with it enabled.
Open DNS
208.67.222.222
208.67.220.220
2620:0:ccc::2 IPV6
2620:0:ccd::2 IPV6
8.8.8.8
8.8.4.4
2001:4860:4860:0:0:0:0:8888 google IPv6:
rogers DNS:
64.71.255.204
64.71.255.198
IPV6: don't have that available at the moment.
Fwiw, UDP packet loss thru the modem is a known issue. Its probably the same situation as the Puma 6 modem.
@MegnaGaming, sorry this is taking so long. You were asking earlier about the addition of the IPV6 ICMP rule, you should only have selected IPV6icmp out of the list of rules to add.
@RyzenFX well, its still early days for that firmware as it's only been out for two or three days now. There is still a lot of testing that should be done, and from NetDog's comments, that version is the first kick at the cat for TCP and UDP.
I think there are a few details that have to be worked out such as testing UDP, primarily, whats the correct packet size and what do you use to test it. There are discussions on this on the github Iperf page. From random reading, the actual DNS UDP packet is pretty small, much smaller than the packet sizes that I have been testing with, however, from the github site, you should be able to run tens of Gb/s, using UDP during a data transfer. I don't know what the packet sizes are for gaming, but I'm interested in what they are. On my list of things to do is load an older version of Iperf and compare that to the recent version which apparently generates excessive UDP test errors. This is where the network experts need to have at it to make sure that the testing is reasonable and correct, and that the results are correct. Someone, or a team of people with Dave's knowledge and experience level comes to mind. So, that's just one detail. I'm sure that there are others lurking about.
In terms of how this will translate to the Puma 7 is a very good question indeed. The results with the Puma 7 in terms of latency are much better than the Puma 6/6MG, but, the question that needs to be asked, is, "Is that all there is?" The high latency spikes are gone, but what is visible now are low level latency spikes, even in quiet hours, but, I don't have a similar view of a Broadcom modem on the Rogers network in order to make a comparison and know if the low level spikes are the result of the Puma 7 modem or of the CMTS loading. The interesting question at this point is whether or not DOCSIS 3.1 will change the latency behaviour. That might not happen until 3.1 upstream is enabled, which is several months away. So, at the moment its a guess. Porting the changes over to the Puma 7 in theory might make a difference, but, I'm not aware at the moment if the packet processing is done by the CPU or by the Hardware Accelerator in the Puma 7. Dave would probably be able to tell us that. If the processing is done by the CPU, then my guess is that the same changes would yield better results. If the processing in already done by the Hardware Accelerator, then as I said, "Is that all there is?"
Here's an examle of what I'm talking about:
https://www.dslreports.com/forum/r31232323-
Those are TCP/IP to google.ca. You could just call it ICMP to the CMTS for all that it matters although the base latency to the CMTS is 10 ms throughout the day with much higher latency spikes in the evening. The issue is still the same, low level latency that continues throughout the day and that becomes much worse during evening hours. Can that be improved with either a firmware update such as what is occurring with the Puma 6/6MG or with DOCSIS 3.1? Good question. Wish I had that answer at the moment.
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