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thapoet

join:2008-07-18

My 8 Mbps Comcast connection is slow

I live outside of Nashville and I recently subscribed to Comcast's 8 Mbps connection but it is so slow. I have a Thomson DHG535 modem (»www.thomson.net/GlobalEnglish/Pr···ult.aspx) and have tested my connection here and at speedtest. I am only getting 3 Mbps down and 1.5 Mbps up. Any ideas as to why it is so slow?



dadkins
Can you do Blu?
Premium,MVM
join:2003-09-26
Hercules, CA
kudos:18

1 edit

1 recommendation

Run this: »/tweaks
... and post the results URL here.
Thanks!

A question I have to ask - where did you get that eMTA?
--
Think outside the Fox... Opera



CleanGene
Premium,MVM
join:2008-04-09
Manassas, VA

1 recommendation

reply to thapoet

CC uses both Arris and RCA/Thomson EMTAs, so I'd imagine he got it from Comcast



tshirt
Premium,MVM
join:2004-07-11
Snohomish, WA
kudos:4
reply to thapoet

as dadkins suggests, we ne mor info/input
»Comcast High Speed Internet FAQ »How To Get Help!
answer those in this thread


thapoet

join:2008-07-18

1 edit

[[ BACKGROUND INFORMATION ]]
1) Your location: City and State.
Nashville, TN

2) A description of the problem.
I am a Comcast 8 Mbps subscriber and it seems extremely slow. I regularly score 3 Mbps at the speed test sites.

The last two files I downloaded averaged 90 KB/sec with a peak download speed of 212 KB/sec.

3) Is the issue intermittent, constant or does it occur at a specific time of day?
Constant

4) Your modem make, model & firmware version.
Make: RCA (Thomson), Model: DHG535, Firmware: ST70.02.08.03

5) Describe any home networking if applicable. (i.e. routers, hubs, adapters, etc.)
Linksys WRT54GL w/ Stock Antennas and Tomato Firmware 1.19

6) List any firewall and/or anti-virus software you have installed. Include what version you have.
McAfee VirusScan Plus with SiteAdvisor 2008 (I've tried both activating and deactivating the firewall)

[[ SPEED TESTS FROM DSLREPORTS ]]
Ft. Worth

Chicago


[[ SPEED TESTS FROM SPEEDTEST.NET ]]
Ft. Worth

Chicago

Lexington, KY

Morristown, TN


[[ TWEAK TEST RESULTS ]]
1. Your Tweakable Settings
Receive Window (RWIN): 17520
Window Scaling: off
Path MTU Discovery: ON
RFC1323 Window Scaling: OFF
RFC1323 Time Stamping: OFF
Selective Acks: ON
MSS requested: 1460
TTL: unknown
TTL remaining: 112
TOS flags: none set

2. Test Download
Actual data bytes sent: 1024001
Actual data packets: 703
Max packet sent (MTU): 1500
Max packet recd (MTU): 1500
Retransmitted packets: 0
sacks you sent: 1
pushed data pkts: 173
data transmit time: 2.905 secs
our max idletime: 247.5 ms
transfer rate: 320470 bytes/sec
transfer rate: 2563 kbits/sec
transfer efficiency: 100%

3. ICMP (ping) check
Target unpingable



jaceg
Keep'In An Eye Out For Ya
Premium
join:2000-08-12
Revere, MA
kudos:1
Reviews:
·Comcast

1 recommendation

reply to thapoet

Go here: »/drtcp

Download DrTCP.

Open DrTCP and select your ethernet adapter from the dropdown list.

Next, change your RWIN to 87600. Tab through the rest if the settings (default) until you get to MTU. Change your MTU to 1500 (if not already)and "Save", Exit.

Restart your computer and run a Tweaks Test and a speed test.

Report back with your results.
--
They may forget what you said but they will never forget how you made them feel.-- Anonymous


thapoet

join:2008-07-18

1 edit

After DrTCP...

[[ SPEED RESULTS FROM DSLREPORTS ]]
Ft. Worth

Chicago


[[ SPEED RESULTS FROM SPEEDTEST.NET ]]
Ft. Worth

Chicago

Lexington, KY

Morristown, TN


[[ RESULTS FROM TWEAK TEST ]]
1. Your Tweakable Settings
Receive Window (RWIN): 87600
Window Scaling: 1
Path MTU Discovery: ON
RFC1323 Window Scaling: ON
RFC1323 Time Stamping: OFF
Selective Acks: ON
MSS requested: 1460
TTL: unknown
TTL remaining: 112
TOS flags: none set

2. Test Download
Actual data bytes sent: 1024001
Actual data packets: 703
Max packet sent (MTU): 1500
Max packet recd (MTU): 1500
Retransmitted packets: 0
sacks you sent: 0
pushed data pkts: 99
data transmit time: 3.049 secs
our max idletime: 405.4 ms
transfer rate: 292830 bytes/sec
transfer rate: 2342 kbits/sec
transfer efficiency: 100%

3. ICMP (ping) check
Target unpingable


thapoet

join:2008-07-18

Could it be as simple as Comcast not giving me what I'm paying for?



CableTool
Poorly Representing MYSELF.
Premium
join:2004-11-12

Constant speed issues such as the one you are describing are rarley an ISP side issue. Generally if you have synch, your speeds are there. Aside from net congestion, there isnt much that will change the speeds.
Bad routers, NICs, USBs, Modems, misconfigurations are generally the culprit.

Its possible you could have the wrong config file.. but no file would correlate to the speeds you are showing.
--
CableTechs.org/"Horrible People with Integrity"


Michael2
Premium,VIP
join:2003-04-01
Owings Mills, MD

1 recommendation

reply to thapoet

said by thapoet:

Could it be as simple as Comcast not giving me what I'm paying for?
thapoet,

Send me an IM with your modem's MAC (it may be designated as the HFC MAC - look at the sticker on the back or bottom of the modem) and I will check the provisioning.

--
Comcast.net Help Forum Administrator.


jaceg
Keep'In An Eye Out For Ya
Premium
join:2000-08-12
Revere, MA
kudos:1
Reviews:
·Comcast
reply to thapoet

Also, remove your Linksys router from the setup.

Connect your computer directly to the modem.

Make sure you power down the modem (unplug if just a modem, press reset button on back if telephony modem).

Then restart your computer.

Check you speed once again.
--
They may forget what you said but they will never forget how you made them feel.-- Anonymous