http://www.dslreports.com/forum/r20646234 en Wed, 11 Nov 2009 10:31:29 EDT Wed, 11 Nov 2009 10:31:29 EDT http://www.dslreports.com/forum/remark,20654344 redxii :
Moderator Action
The post that was here (and all 4 followups to it), has been moved to a new topic .. »[Cable] Comcast Speed Issues, please help]]> http://www.dslreports.com/forum/remark,20654344 Tue, 17 Jun 2008 03:27:58 EDT http://www.dslreports.com/forum/remark,20650786 Irish Shark : ..]]> http://www.dslreports.com/forum/remark,20650786 Mon, 16 Jun 2008 12:44:42 EDT http://www.dslreports.com/forum/remark,20648949 Ikyuao : You're welcome :) and you found a clue :D]]> http://www.dslreports.com/forum/remark,20648949 Mon, 16 Jun 2008 00:25:42 EDT http://www.dslreports.com/forum/remark,20648449 Swine70 : Ok, made some changes.
Thanks Guys!!!

« SpeedGuide.net TCP Analyzer Results »
Tested on: 06.15.2008 22:06
IP address: 98.200.xx.xxx

TCP options string: 020405b4010303040101080a000000000000000001010402
MSS: 1460
MTU: 1500
TCP Window: 1027840 (multiple of MSS)
RWIN Scaling: 4
Unscaled RWIN : 64240
Reccomended RWINs: 64240, 128480, 256960, 513920
BDP limit (200ms): 41114kbps (5139KBytes/s)
BDP limit (500ms): 16445kbps (2056KBytes/s)
MTU Discovery: ON
TTL: 114
Timestamps: ON
SACKs: ON
IP ToS: 00000000 (0)

Results...
Speakeasy results
Download Speed: 23881 kbps (2985.1 KB/sec transfer rate)
Upload Speed: 2358 kbps (294.8 KB/sec transfer rate)

]]> http://www.dslreports.com/forum/remark,20648449 Sun, 15 Jun 2008 22:14:23 EDT http://www.dslreports.com/forum/remark,20648022 Ikyuao : LOL, Welcome. You forget to give a thanks to me :D for helping you. 1MB TCP buffer is good way to go that should get you surfing fast without any problems.
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64K TCP WIN is officially dead for long high latency fat network connection across internet.]]> http://www.dslreports.com/forum/remark,20648022 Sun, 15 Jun 2008 20:37:07 EDT http://www.dslreports.com/forum/remark,20648012 Swine70 : Yea, i believe i might of had an issue somewhere inside the box. it was taking forever just to get to the info in the modem itself.

now i can let the wife use the computer without her cussing me for it being so slow. last night she asked if i had hooked it back up to dialup just to mess with her lol.]]> http://www.dslreports.com/forum/remark,20648012 Sun, 15 Jun 2008 20:34:27 EDT http://www.dslreports.com/forum/remark,20647995 Ikyuao : sure, why not try to do some experimental with 1MB TCP buffer and how you analysis that how works for you :)
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64K TCP WIN is officially dead for long high latency fat network connection across internet.]]> http://www.dslreports.com/forum/remark,20647995 Sun, 15 Jun 2008 20:30:36 EDT http://www.dslreports.com/forum/remark,20647987 Swine70 : Hope ya'll don't mind me posting all the results stuff. it gives me something to look back on in the future...

TCP options string = 020405b40103030401010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.
Default TCP Receive Window (RWIN) = 1027840
RWIN Scaling (RFC1323) = 4 bits (scale factor of 8)
Unscaled TCP Receive Window = 64240

RWIN is a multiple of MSS
Other RWIN values that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)
bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 41114 kbps (5139 KBytes/s) @ 200ms
Your TCP Window limits you to: 16445 kbps (2056 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 114 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)]]> http://www.dslreports.com/forum/remark,20647987 Sun, 15 Jun 2008 20:27:36 EDT http://www.dslreports.com/forum/remark,20647980 Ikyuao : first, speed problems does not affect your network drivers and second, cable speed is not guaranteed.Your TCP 256K window looks good that should be enough for local nation wide internet inside of USA country.
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64K TCP WIN is officially dead for long high latency fat network connection across internet.]]> http://www.dslreports.com/forum/remark,20647980 Sun, 15 Jun 2008 20:26:37 EDT http://www.dslreports.com/forum/remark,20647953 Swine70 : ok i removed all network drivers and rebooted and let everything reinstall itself and it's mostly better now.

]]> http://www.dslreports.com/forum/remark,20647953 Sun, 15 Jun 2008 20:19:28 EDT http://www.dslreports.com/forum/remark,20647835 Swine70 : been changing stuff with dr. tcp if thats what you mean.

TCP receive at 256960
scaling default (switches to yes after reboot)
time stamping Default
selective acks default
Dial up RAS MTU 1500
Path MTU Default
Blackhole Default
max dupe acks blank
ttl blank
MTU 1500]]> http://www.dslreports.com/forum/remark,20647835 Sun, 15 Jun 2008 19:43:59 EDT http://www.dslreports.com/forum/remark,20647814 Ikyuao : Can you tune your TCP in your system before calling tech people to come out to fix a issue on cable wiring?
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64K TCP WIN is officially dead for long high latency fat network connection across internet.]]> http://www.dslreports.com/forum/remark,20647814 Sun, 15 Jun 2008 19:35:43 EDT http://www.dslreports.com/forum/remark,20647808 Swine70 : haven't found any sites that i can't visit. everything is just very slow.]]> http://www.dslreports.com/forum/remark,20647808 Sun, 15 Jun 2008 19:34:07 EDT http://www.dslreports.com/forum/remark,20647801 Ikyuao : Make sure that can you surf a any web sites that you were connected with your cable modem?]]> http://www.dslreports.com/forum/remark,20647801 Sun, 15 Jun 2008 19:31:50 EDT http://www.dslreports.com/forum/remark,20647782 Swine70 : i'll play around with it.
don't know if any of this from modem logs makes since to anyone...

First Time Last Time Counts Level ID Text
Time Not Established Time Not Established 1 Critical (3) 82000200 No Ranging Response received - T3 time-out

Sat Jun 14 19:54:19 2008 Sat Jun 14 19:54:19 2008 1 Critical (3) 82000400 Received Response to Broadcast Maintenance Request, But no Un...

Sat Jun 14 19:23:22 2008
Sat Jun 14 19:23:22 2008 1 Critical (3) 85000100 No UCD's Received - Timeout

Sat Jun 14 19:22:31 2008 Sat Jun 14 19:22:31 2008 1 Critical (3) 82000400 Received Response to Broadcast Maintenance Request, But no Un...]]> http://www.dslreports.com/forum/remark,20647782 Sun, 15 Jun 2008 19:28:20 EDT http://www.dslreports.com/forum/remark,20647756 Ikyuao : Why don't you try some little experimental on TCP? 64K TCP WIN is officially died right now because of high latency when it travels across internet paths if you come from cable that's source of you and your reach to http site at about 50ms RTT that is high latency that you get slow of speed that's why 64K TCP WIN does not good job at keeping bandwidth fully of steam flows at 50ms RTT across of internet path ways.
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64K TCP WIN is not enough for everyone]]> http://www.dslreports.com/forum/remark,20647756 Sun, 15 Jun 2008 19:20:06 EDT http://www.dslreports.com/forum/remark,20647693 Swine70 :
results of line quality test from here.

»/linequality/nil/2396164]]> http://www.dslreports.com/forum/remark,20647693 Sun, 15 Jun 2008 19:01:55 EDT http://www.dslreports.com/forum/remark,20647659 Swine70 : these people at comcast are idiots...

"we'd have to send someone out to do a signal check and a ping test is only used for games"

and i swear that i heard a camel in the background...]]> http://www.dslreports.com/forum/remark,20647659 Sun, 15 Jun 2008 18:53:29 EDT http://www.dslreports.com/forum/remark,20646340 Irish Shark : Your issue is not related to tweaking.

Call Comcast and ask for a signal check and a ping test for packet loss.
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"You can observe a lot by watching". Yogi Berra]]> http://www.dslreports.com/forum/remark,20646340 Sun, 15 Jun 2008 12:35:49 EDT http://www.dslreports.com/forum/remark,20646320 Ikyuao : Your cable modem between and your computer are connected? 256K TCP WIN should be fine but comcast never sell you fastest dedicate. comcast, cox and other cable companies are providing a internet access and speed is not promised.]]> http://www.dslreports.com/forum/remark,20646320 Sun, 15 Jun 2008 12:30:50 EDT http://www.dslreports.com/forum/remark,20646312 Swine70 : Oh. and no network of any sort. just cable modem to this computer.]]> http://www.dslreports.com/forum/remark,20646312 Sun, 15 Jun 2008 12:29:32 EDT http://www.dslreports.com/forum/remark,20646301 Swine70 : ok. i got 1 speed test to kind of work...
screen shot.
»img396.imageshack.us/my.php?imag···tdn0.jpg



Results could not be recorded
latency to server 14ms
download speed 11Kb/s
upload 933 Kb/s

Sprint Fort Worth test location]]> http://www.dslreports.com/forum/remark,20646301 Sun, 15 Jun 2008 12:27:38 EDT http://www.dslreports.com/forum/remark,20646297 Ikyuao : Cable network is just share system. cable will never give you 1ms RTT flat dedicate get you fastest speed, like I never get 1ms RTT on cable share network what I'm on a cable.
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64K TCP WIN is not enough for everyone]]> http://www.dslreports.com/forum/remark,20646297 Sun, 15 Jun 2008 12:26:56 EDT http://www.dslreports.com/forum/remark,20646234 Swine70 : I am on Houston Comcast. my modem is from comcast, has no name on it. i did just replace it about 3 weeks ago.
for the past 2 days My connection has extremly slow and I haven't been able get any speed test to load. it just sits at transfering data, i had this issue once before and used drtcp to change some things and had very good speed for a day. all the setting i had changed in drtcp are the same as i had set them to when it was at it's fastest so now i'm very lost.

SpeedGuide.net TCP/IP Analyzer

TCP properties for IP = 98.200.91.170 (98.200.91.170)
Browser/OS = Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) Gecko/20080404 Firefox/2.0.0.14
Notes: Read the Analyzer FAQ if the above is not your IP address.
TCP options string = 020405b40103030201010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.
Default TCP Receive Window (RWIN) = 256960
RWIN Scaling (RFC1323) = 2 bits (scale factor of 4)
Unscaled TCP Receive Window = 64240

RWIN is a multiple of MSS
Other RWIN values that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4) -- current value
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)
bandwidth * delay product (Note this is not a speed test):

Your TCP Window limits you to: 10278 kbps (1285 KBytes/s) @ 200ms
Your TCP Window limits you to: 4111 kbps (514 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 114 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)

EDITED, ADDED modem info here...

AMBIT Broadband

Cable Modem : DOCSIS 1.0/1.1/2.0 Compliant
MAC Address : 00:1f:3a:2e:d3:e4
Serial Number : 001F3A2E****
Boot Code Version : 2.1.6d
Software Version : 2.93.1008
Hardware Version : 1.20]]> http://www.dslreports.com/forum/remark,20646234 Sun, 15 Jun 2008 12:12:41 EDT