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EricBergan
Premium Member
join:2002-07-22
Mountain View, CA

1 edit

EricBergan

Premium Member

[Speed] Not seeing full download speed

Not seeing the full download speed, also getting errors trying to connect to some sites, and inbound according to my line monitoring.

»stage.results.speedtest. ··· 0842.png

PeteC2
Got Mouse?
MVM
join:2002-01-20
Bristol, CT

PeteC2

MVM

What tier are you on, extreme?

What modem and router are you using?

Can you post your modem stats?
EricBergan
Premium Member
join:2002-07-22
Mountain View, CA

EricBergan

Premium Member

Yes, extreme 50 (now 105.)

Ubee modem, Linksys E3000 running ddwrt for router.

Stats:

Cable Modem : DOCSIS 1.0/1.1/2.0/3.0 Compliant
MAC Address : 90:6E:BB:ED:F8:34
Serial Number : A9U2V55002198
Boot Code Version : 6.1.1c
Software Version : 3.10.1309
Hardware Version : 1.47.3
CA Key : Installed

Cable Modem Status

Item Status Comments
Acquired Downstream Channel 723 MHz Primary Downstream Locked
Ranged Upstream Channel 23.7 MHz Success
Provisioning State OK Operational
Ethernet Link Status Up 1000 Mbps/Full duplex

Cable Modem Downstream

DS-1 DS-2 DS-3 DS-4
Frequency 723000000 717000000 735000000 753000000
Lock Status
(QAM Lock/FEC Sync/MPEG Lock) Y/Y/Y Y/Y/Y Y/Y/Y Y/Y/Y
Channel Id 3 2 5 8
Modulation 256QAM 256QAM 256QAM 256QAM
Symbol Rate
(Msym/sec) 5.360537 5.360537 5.360537 5.360537
Interleave Depth I=32
J=4 I=32
J=4 I=32
J=4 I=32
J=4
Power Level
(dBmV) 4.56 5.68 4.92 4.04
RxMER
(dB) 35.42 35.25 36.17 36.17
Correctable
Codewords 289 319 86 16
Uncorrectable
Codewords 1595 1364 1364 1364

Cable Modem Upstream

US-1 US-2 US-3 US-4
Channel Type 2.0 N/A 1.0 2.0
Channel ID 6 N/A 4 5
Frequency
(Hz) 23700000 N/A 35400000 30600000
Ranging Status Success N/A Success Success
Modulation 64QAM N/A 16QAM 64QAM
Symbol Rate
(KSym/sec) 5120 N/A 2560 5120
Mini-Slot Size 4 N/A 4 4
Power Level
(dBmV) 44.25 N/A 44.25 44.00
T1 Timeouts 0 0 0 0
T2 Timeouts 0 0 0 0
T3 Timeouts 0 0 0 0
T4 Timeouts 0 0 0 0

Cable Modem Upstream Burst

US-1

Req

Init Maint

Per Maint

Adv Short

Adv Long

Adv UGS

(1)

(3)

(4)

(9)

(10)

(11)

Modulation Type QPSK QPSK QPSK 64QAM 64QAM 64QAM
Differential Encoding OFF OFF OFF OFF OFF OFF
Preamble Length 64 640 384 104 104 104
Preamble Value Offset 652 0 0 724 724 724
FEC Error Correction (T) 0 5 5 12 16 12
FEC Codeword Information Bytes (k) 16 34 34 81 223 81
Maximum Burst Size 0 0 0 11 193 219
Guard Time Size 8 48 48 8 8 8
Last Codeword Length FIX FIX FIX SHORT SHORT SHORT
Scrambler on/off ON ON ON ON ON ON

US-2

Modulation Type
Differential Encoding
Preamble Length
Preamble Value Offset
FEC Error Correction (T)
FEC Codeword Information Bytes (k)
Maximum Burst Size
Guard Time Size
Last Codeword Length
Scrambler on/off

US-3

Req

Init Maint

Per Maint

Short Data

Long Data

(1)

(3)

(4)

(5)

(6)

Modulation Type QPSK QPSK QPSK 16QAM 16QAM
Differential Encoding OFF OFF OFF OFF OFF
Preamble Length 56 640 384 168 192
Preamble Value Offset 652 0 0 712 712
FEC Error Correction (T) 0 5 5 6 8
FEC Codeword Information Bytes (k) 16 34 34 78 220
Maximum Burst Size 0 0 0 23 255
Guard Time Size 8 48 48 8 8
Last Codeword Length FIX FIX FIX SHORT SHORT
Scrambler on/off ON ON ON ON ON

US-4

Req

Init Maint

Per Maint

Adv Short

Adv Long

Adv UGS

(1)

(3)

(4)

(9)

(10)

(11)

Modulation Type QPSK QPSK QPSK 64QAM 64QAM 64QAM
Differential Encoding OFF OFF OFF OFF OFF OFF
Preamble Length 64 640 384 104 104 104
Preamble Value Offset 652 0 0 724 724 724
FEC Error Correction (T) 0 5 5 12 16 12
FEC Codeword Information Bytes (k) 16 34 34 81 223 81
Maximum Burst Size 0 0 0 11 193 219
Guard Time Size 8 48 48 8 8 8
Last Codeword Length FIX FIX FIX SHORT SHORT SHORT
Scrambler on/off ON ON ON ON ON ON

Last few event log entries:

Sun Mar 17 23:11:06 2013 Tue Mar 19 11:03:09 2013 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Tue Mar 19 11:06:30 2013 Tue Mar 19 11:06:30 2013 Warning (5) MIMO Event MIMO: Stored MIMO=1 post cfg file MIMO=-1;CM-MAC=90:6e:bb:ed:f8:34;CMTS-MAC=00:01:5c:32:31:8e;CM-QOS=1.1;CM-VER=3.0;
Tue Mar 19 16:18:37 2013 Tue Mar 19 16:18:37 2013 Critical (3) No Ranging Response received - T3 time-out
Wed Mar 20 07:13:42 2013 Wed Mar 20 07:13:42 2013 Warning (5) MIMO Event MIMO: Stored MIMO=1 post cfg file MIMO=-1;CM-MAC=90:6e:bb:ed:f8:34;CMTS-MAC=00:01:5c:32:31:8e;CM-QOS=1.1;CM-VER=3.0;
EricBergan

EricBergan

Premium Member

I'm not a cable modem wonk, but looking at it, is the issue something with US-2?

pflog
Bueller? Bueller?
MVM
join:2001-09-01
El Dorado Hills, CA

pflog

MVM

said by EricBergan:

I'm not a cable modem wonk, but looking at it, is the issue something with US-2?

No, you're just bonding 3 channels not all 4. I don't know if we've seen any evidence of someone bonding 4 US channels to date.

Signals and # of codeword errors all look fine at first glance.
EricBergan
Premium Member
join:2002-07-22
Mountain View, CA

EricBergan

Premium Member

Here is the line monitor graph from SFO, CA, USA

»64.81.79.40/r3/cricket/g ··· and=5601

bradyr
YCCD - Network Operations
Premium Member
join:2008-10-27
Sonora, CA

bradyr

Premium Member

that speed test you showed in your original post, was that tested over wired connection or wireless, by chance?
EricBergan
Premium Member
join:2002-07-22
Mountain View, CA

EricBergan

Premium Member

said by bradyr:

that speed test you showed in your original post, was that tested over wired connection or wireless, by chance?

Wired over gigabit connections.

Ultibeam
join:2008-05-27
USA

Ultibeam to EricBergan

Member

to EricBergan
What's your ShaperProbe?
EricBergan
Premium Member
join:2002-07-22
Mountain View, CA

EricBergan

Premium Member

said by Ultibeam:

What's your ShaperProbe?

Hmmm - mystery deepens. ShaperProbe is getting close to 100 Mbps down, but seeing less that 1 Mbps up?

DiffProbe release. January 2012. Build 1008.
Shaper Detection Module.

Connected to server 64.9.225.153.

Estimating capacity:
Upstream: 864 Kbps.
Downstream: 96830 Kbps.

The measurement will take upto 5.5 minutes. Please wait.

Checking for traffic shapers:

Upstream: No shaper detected.
Median received rate: 896 Kbps.

Downstream: No shaper detected.
Median received rate: 95424 Kbps.

For more information, visit: »www.cc.gatech.edu/~parth ··· iffprobe
EricBergan

EricBergan

Premium Member

More investigation. Only one of the two line monitor servers is seeing the packet loss. SFO (64.81.79.40) is still seeing 20-50% packet loss, but ny-monitor.dslreports.com is not seeing any packet loss. Loss started when I initially rebooted the modem yesterday.

Tracert and ping to the 64.81.79.40 server don't show any problems.

I'm getting other sites that seem to have bad connectivity. They have problems with multiple computers/browsers on the network. But respond fine if I use the same device/site via 4G.
EricBergan

EricBergan

Premium Member

OK, solved the problem. Hooked up directly to the modem, and speed went up, and sites that I was having problems with came up. So I did lots of debugging of the router, all with no success. Finally, came across a web posting suggesting forcing a new IP address assignment from Comcast, via MAC clone. Did that, now everything works! Speed has gone up (and now diffprobe is seeing the proper upload speeds), and the sites that were not coming up are now doing fine. I have no idea why this would fix things, but I'm not going to argue with it.