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jmck
formerly 'shaded'

join:2010-10-02
Ottawa, ON
Reviews:
·TekSavvy DSL
·Start Communicat..

Packet loss tonight

Tonight I started noticing a bit of packet loss. To be sure it wasn't my router, cycled the modem and connected it directly to my machine.

Here are 2 mtrs, one from each direction and both show the packet loss happening on the first hop:

                                                                                                   Packets               Pings
 Host                                                                                            Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. 10.106.248.129                                                                                2.2%    46    8.2   8.7   6.1  18.9   2.8
 2. 24.156.149.217                                                                                2.2%    46   17.8  18.1  13.5  39.1   5.2
 3. so-5-0-0.gw02.bloor.phub.net.cable.rogers.com                                                 0.0%    46   19.7  22.7  15.1  37.0   3.9
 4. v514.core1.tor1.he.net                                                                        0.0%    46   15.1  19.7  14.2  36.4   4.9
 5. 10gigabitethernet3-1.core1.nyc5.he.net                                                        0.0%    46   30.1  33.0  28.1  42.0   4.1
 6. 10gigabitethernet3-2.core1.nyc1.he.net                                                        0.0%    46   40.5  33.9  30.0  43.5   3.7
 7. 216.66.30.218                                                                                 2.2%    46   34.1  31.9  30.1  34.2   1.0
 8. rakis.net                                                                                     4.3%    46   34.0  33.9  30.6  46.3   2.7
 

                                                                                                   Packets               Pings
 Host                                                                                            Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. nyc.rt2.cyberwarp.net                                                                         0.0%    71    0.5   0.5   0.4   0.6   0.1
 2. v103.core1.nyc1.he.net                                                                        0.0%    71    0.5   3.2   0.4  11.8   3.6
 3. 10gigabitethernet3-3.core1.nyc5.he.net                                                        0.0%    71   11.4   3.1   0.4  12.2   3.6
 4. 10gigabitethernet3-4.core1.tor1.he.net                                                        0.0%    71   22.6  17.1  14.4  25.6   3.6
 5. start-communications.10gigabitethernet3-1.core1.tor1.he.net                                   0.0%    70   14.5  17.7  14.5 200.5  22.2
 6. 64.140.112.146                                                                                0.0%    70   22.1  28.6  17.1 657.6  76.3
 7. 10.106.248.129                                                                                0.0%    70   24.6  26.7  24.4  31.9   2.1
 8. dhcp-24-53-250-38.cable.user.start.ca                                                         1.4%    70   31.9  34.6  30.2  55.8   4.7
 

I have a Thomson 476 modem but I'm not sure how to connect to it to get the line stats (nothing in the 'manual' provided with the modem), nothing coming up in google first page results too.


jmck
formerly 'shaded'

join:2010-10-02
Ottawa, ON
Found the default IP (192.168.100.1) for the DCM476, here are the stats:



DrugTito

join:2013-01-17
canada
Same in Kitchener.

Ping statistics for 74.125.226.34:
Packets: Sent = 42, Received = 38, Lost = 4 (9% loss),
Approximate round trip times in milli-seconds:
Minimum = 11ms, Maximum = 24ms, Average = 14ms

Cant play games at all.

World of tanks, that i am currently playing, ping is between 200-300ms.


jmck
formerly 'shaded'

join:2010-10-02
Ottawa, ON
Reviews:
·TekSavvy DSL
·Start Communicat..
well mine wasn't that bad, it only started at around 8pm i think, and lasted until a few minutes around at 11:30pm and it stayed about 2% the entire time.

since it was happening on my first hop, i know it's likely not a Start issue and i'm worried it's a capacity issue on my segment at peak :/


dillyhammer
START me up
Premium
join:2010-01-09
Scarborough, ON
kudos:10
Reviews:
·WIND Mobile
·Start Communicat..
reply to jmck
Just went through the same ordeal a couple days ago. Corrected itself after a while. Down for a good 5 hours. Cogeco (via ticket) denied anything was wrong, said maybe it was a virus.



Mike

Guru

join:2008-10-01
kudos:2
said by dillyhammer:

maybe it was a virus.

LOL... I mean you serious?


rocca
Start.ca
Premium
join:2008-11-16
London, ON
kudos:23
reply to jmck
said by jmck:

since it was happening on my first hop, i know it's likely not a Start issue and i'm worried it's a capacity issue on my segment at peak :/

Yes the loss at the 10.x address does support that, hopefully it's a Sunday evening anomaly, if not they are pretty good at upgrades.


rocca
Start.ca
Premium
join:2008-11-16
London, ON
kudos:23
reply to dillyhammer
said by dillyhammer:

Cogeco (via ticket) denied anything was wrong, said maybe it was a virus.

Yeah, I saw that in the ticket too - surprised our staff mentioned that part, unless it was more tongue in cheek. We have seen in the past though where machines that were infected with botnet's suffer loss when participating in an attack.


jmck
formerly 'shaded'

join:2010-10-02
Ottawa, ON
Reviews:
·TekSavvy DSL
·Start Communicat..

1 edit
reply to rocca
said by rocca:

said by jmck:

since it was happening on my first hop, i know it's likely not a Start issue and i'm worried it's a capacity issue on my segment at peak :/

Yes the loss at the 10.x address does support that, hopefully it's a Sunday evening anomaly, if not they are pretty good at upgrades.

Even in R land? I believe dilly is on Cogeco. The packet loss seems to have started 15 mins ago again, both directions again:

                                                 Packets               Pings
 Host                                          Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. 192.168.1.1                                 0.0%   103    0.8   0.7   0.6   1.3   0.1
 2. 10.106.248.129                              2.9%   103    7.1   8.5   6.8  19.2   1.8
 3. 24.156.149.217                              0.0%   103   20.1  19.6  14.5  43.1   5.6
 4. 69.63.249.9                                 2.9%   102   21.7  21.5  14.8  34.7   4.5
 5. v514.core1.tor1.he.net                      2.0%   102   19.3  20.3  16.1  29.3   3.8
 6. 10gigabitethernet3-1.core1.nyc5.he.net      1.0%   102   30.7  33.3  29.4  41.9   3.9
 7. 10gigabitethernet3-2.core1.nyc1.he.net      2.0%   102   36.6  32.6  28.3  58.9   4.7
 8. 216.66.30.218                               2.0%   102   31.6  31.1  29.1  46.0   2.5
 9. rakis.net                                   1.0%   102   35.5  31.2  28.7  47.0   2.3
 

                                                 Packets               Pings
 Host                                          Loss%   Snt   Last   Avg  Best  Wrst StDev
 1. nyc.rt2.cyberwarp.net                       0.0%   101    0.4   0.5   0.4   1.3   0.1
 2. v103.core1.nyc1.he.net                      0.0%   101    2.0   3.2   0.4  11.4   3.6
 3. 10gigabitethernet3-3.core1.nyc5.he.net      0.0%   100    1.2   2.9   0.4  12.9   3.4
 4. 10gigabitethernet3-4.core1.tor1.he.net      0.0%   100   17.9  16.8  14.4  25.3   3.3
 5. start-communications.10gigabitethernet3-1.  0.0%   100   14.6  24.8  14.5 306.7  42.1
 6. 64.140.112.146                              0.0%   100   17.6  19.8  17.0 183.4  16.6
 7. 10.106.248.129                              0.0%   100   24.5  23.6  23.2  40.1   1.7
 8. dhcp-24-53-250-37.cable.user.start.ca       1.0%   100   31.2  30.9  28.9  43.2   2.0
 

It was fine from 11:30pm last night until about 15-20 mins ago (9:30am).


pnear

join:2002-06-12
Milton, ON
reply to jmck
I've been having issues intermittently as well, and am getting ready for the next incident with a suite of testing tools to run. Not sure if it's packet loss or something else.

What are you using to generate that packet loss report?


jmck
formerly 'shaded'

join:2010-10-02
Ottawa, ON
Reviews:
·TekSavvy DSL
·Start Communicat..
I'm using 'mtr' originally it meant "Matts traceroute" but now it means "My traceroute". I use it on Linux and OSX, but there's a windows version of it (WinMTR I think).

It essentially combines traceroute and ping and paints a better picture where the problem is.


pnear

join:2002-06-12
Milton, ON
Thanks, my results look pretty bad through that lens. Will try switching out a few points of failure. Packet loss at every point in the route right now.


rocca
Start.ca
Premium
join:2008-11-16
London, ON
kudos:23
said by pnear:

Packet loss at every point in the route right now.

You have to remember that packets to hop 2 also go through hop 1, so if you have problems at hop 1 you're going to see problems further down the line too. (ie hop 2 isn't just hop 2, it's a combination of 1+2, likewise hop 3 is 1+2+3)

Guru

join:2008-10-01
kudos:2
But if the problem was at hop 1 then, wouldn't it show at hop 1 as well?


rocca
Start.ca
Premium
join:2008-11-16
London, ON
kudos:23
Yes. I'm replying to the comment about seeing "Packet loss at every point in the route", it's not that every hop has a problem, it's the first one and you see it at all the subsequent hops because the packet still goes through that first hop (or whatever hop the problem first starts at).

Guru

join:2008-10-01
kudos:2
ah ok.


pnear

join:2002-06-12
Milton, ON
reply to rocca
Tested at various points in my network, this one taken directly connected to the modem after a power cycle is probably the most relevant.

|---------------------------------------------------------------------------------- --------|
|                                      WinMTR statistics                                   |
|                       Host              -   %  | Sent | Recv | Best | Avrg | Wrst | Last |
|------------------------------------------------|------|------|------|------|------|------|
|                              10.193.4.1 -    9 |   45 |   41 |    6 |    7 |   12 |    7 |
|      asr-link1-burlington1.net.start.ca -   11 |   46 |   41 |    8 |    9 |   16 |    9 |
|                          64.140.112.157 -   20 |   51 |   41 |    8 |   14 |  107 |    8 |
|    gw-google.torontointernetxchange.net -    0 |   42 |   42 |    8 |   13 |   83 |    9 |
|                          216.239.47.114 -   15 |   48 |   41 |    8 |   11 |   53 |   10 |
|                           72.14.233.142 -   13 |   47 |   41 |    8 |   10 |   24 |   10 |
|               yyz06s05-in-f23.1e100.net -    9 |   45 |   41 |    8 |    9 |   14 |   10 |
|________________________________________________|______|______|______|______|______|______|
 

A description of the symptoms: every once in awhile (sometimes once a week, lately once a day), some sites fail to load. I originally was thinking DNS issues, since some things would come in and others would fail. Sometimes a modem reset fixes it, sometimes it doesn't.

I'm conscious of hijacking your thread, sorry. I can start another if it makes more sense.

-Pete


pnear

join:2002-06-12
Milton, ON
I should add - I tested with OpenDNS instead of Start's DNS the last time this got really bad and got the same symptoms, so I'm fairly sure it's not a DNS issue.


rocca
Start.ca
Premium
join:2008-11-16
London, ON
kudos:23

1 recommendation

Yeah, DNS doesn't have anything to do with packet loss.

Your MTR shows loss on the first hop, ie the 10.x IP which is the CMTS so you're seeing loss between your modem and the CMTS (ie Cogeco issue). Suggest calling in a ticket.


pnear

join:2002-06-12
Milton, ON
said by rocca:

Yeah, DNS doesn't have anything to do with packet loss.

Understood, that was just one of the troubleshooting steps I took over the last couple weeks. Just discovered the packet loss issue today.

Will call in a ticket.

Guru

join:2008-10-01
kudos:2
reply to rocca
I must admit that Rocca does excellent job in explaining technical issue. Kudos to you mate!!


rocca
Start.ca
Premium
join:2008-11-16
London, ON
kudos:23
Thanks.