lperdue
join:2008-03-11
Sonoma, CA | reply to drmorley
Re: Comcast is throttling FTP uploads
Thanks drmorley ... it always helps to know I'm not alone! |
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Backy
@comcast.net
| reply to lperdue
Noticed some COMCAST throttling today also....i downloaded a couple of movies via torrent and after download i upload the files to my WEB server via FTP and WOW i noticed decrease in upload speed.
im on a Comcast performance plan 8mb/768
my steady upload speed is used to be 90KBs after powerboost dies out and all. this is tested all the time on the same server, fastest server i could find the rest is just slow. today is diffrent after using utorrent for awhile. i tried to upload to my server via FTP.
AND WOW
MY UPLOAD SPEED DROPS DOWN TO 55-60KB/s. this happens alot of time now and im getting pissed by this throttling.i usually just do a MODEM power cycle before everytime this happens then my speed goes back to optimum speed...but now it happening again and i cant take this anymore. |
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deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE
| Hmm, interesting. I wonder if others are noticing similar results. That seems to imply the sandvine/P2P usage is related. Though resetting the modem doesn't jive with that. Perhaps rebooting the modem has allowed it to sync with better results.
If you just upload a large file without any P2P activity prior, does it still get throttled?
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Hello...is there anybody in there? |
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espaeth
Digital Plumber
Premium,MVM
join:2001-04-21
Minneapolis, MN
 ·voip.ms
·Vitelity VOIP
·Callcentric
·VoiceStick
·ViaTalk
 ·Comcast
 ·Embarq
| reply to lperdue
Cacti graph of Comcast connection (1 minute polling) |
Traffic source: Brooklyn Park, MN Comcast 8/768 residential service
Traffic destination: Coloquest / Gigenet in Chicago. Server port speed 100mbps.
Protocol used: FTP
Traceroute to colo facility:
Client side logs:
Server side logs:
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deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE
| Totally OT here, but you should check out rrdtool 
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Hello...is there anybody in there? |
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espaeth
Digital Plumber
Premium,MVM
join:2001-04-21
Minneapolis, MN | Cacti is just a front-end for RRDtool (the graph I posted is a RRD graph) -- if I were less lazy had more free time I could get the same output by setting up the appropriate graph template to feed the right parameters to RRDTool. |
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deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE
| Ah yeah, I noticed there were more than 2 data plots on it, so that makes sense. I looked at cacti a while back, but decided to learn RRDtool instead.
So you can just tell cacti to use some different parameters for the graphing? Is the syntax a little more intuitive than the RPN and CDEF stuff for rrdtool?
Anyway, sorry to derail the thread.
--
Hello...is there anybody in there? |
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valis
@comcast.net
| reply to lperdue
I can confirm I see the same behaviour, I just assumed it was another side effect of them using powerboost! to oversell their lines.
When I upload work files via ftp, I will get my rated outbound speeds (up to ~120Kb/s) for the first 10-16Mb, at which point I will see the connection speed drop to between ~40-50Kb/s for the duration of the transfer. If there is latency or routing issues at the start limiting my initial speed to say 75Kb/s, then by the time the throttling kicks in I will be down to 30-35Kb/s max. This holds whether I use direct ftp or a vpn connection btw.
I don't think this is in relation to p2p software either, though there's defiantely an effect there as well. I recently used uTorrent to grab a newer copy of 'supergrubdisk' and watched my WAN connection consistantly go stale across the board (ftp/http as well as the torrent connections). Closing utorrent solved the problem within seconds, but I needed supergrub (and gparted after that) to help troubleshoot some issues with one of my local boxes.
Incidentally I pay for the upgraded linespeeds and while my 'boosted' speeds are higher I still see the same throttling that I had before. I would switch but the only other option is Qwest, and I already bailed on them due to similar issues (and lower speeds/higher cost). |
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mardyron
join:2004-02-06
Hydes, MD
| reply to lperdue
quote:
These are hosted servers, with no throttling, giant bandwidth and I'm paying for massive gigabytes of throughputs.
Sorry I didn't read all the replies to confirm if this was covered. But I do have a ?, Did you verify that the hoster doesn't cap upload to the ftp? Many hosting companies cap the upload. You may want to confirm this before going any further, As this is why I canged from several different hosting companies.
Also, what software are you using to upload? Have you gotten faster thru another ftp site @ anytime? Some of the lite software dont really use the broadband speeds. |
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kelso
join:2007-04-06
Ashburn, VA
1 edit | reply to valis
said by valis :
When I upload work files via ftp, I will get my rated outbound speeds (up to ~120Kb/s) for the first 10-16Mb, at which point I will see the connection speed drop to between ~40-50Kb/s for the duration of the transfer. If there is latency or routing issues at the start limiting my initial speed to say 75Kb/s, then by the time the throttling kicks in I will be down to 30-35Kb/s max. This holds whether I use direct ftp or a vpn connection btw.
After reading your post, I thought maybe I didn't try a large enough file.
I tried and had no problems with a big file... (both machines are suse linux).
I used SFTP on port 443 from the office to my home Comcast machine and did a get (transferring a file up to the office).
The file was 162 Meg and transferred at almost my full upload (2M) speed.
Here are the results at various points...
1% 2464KB 242.2KB/s 11:15 ETA
3% 6624KB 282.8KB/s 09:23 ETA
8% 13MB 273.8KB/s 09:16 ETA
10% 17MB 287.0KB/s 08:38 ETA
15% 25MB 284.8KB/s 08:12 ETA
20% 33MB 271.8KB/s 08:05 ETA
25% 41MB 219.5KB/s 09:23 ETA
39% 63MB 190.1KB/s 08:51 ETA
44% 72MB 231.6KB/s 06:40 ETA
50% 81MB 272.6KB/s 05:04 ETA
60% 98MB 212.5KB/s 05:10 ETA
70% 114MB 134.0KB/s 06:11 ETA
79% 128MB 238.6KB/s 02:25 ETA
85% 139MB 261.5KB/s 01:32 ETA
91% 149MB 225.7KB/s 01:01 ETA
100% 162MB 232.2KB/s 11:55
Edit: I wonder if there is a difference if the TCP session is established from inside or outside the Comcast network.
Ie. Connect in and pull (as I did) or connect out and push (as you did). |
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nothing here
@comcast.net | reply to lperdue
I just ftp uploaded a 4.7 GB dvd at 310KB (~2.8mbit) per second, on my comcast home connection. no throttling in sight at any stage. |
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Swarms
@comcast.net
| reply to lperdue
I just want to add my name to the list of people that have noticed throttling over FTP. All uploads start around 120KB/s and then slowly taper off after around 10MB to around 45KB/s for the remainder. I don't use P2P, I know it's not a limitation on the server I'm sending to, and this isn't a fairly new problem. It started around the same time the bittorrent throttling reports came out as far as I can remember. At least there's workarounds for that...
I'm using FlashFXP by the way, if that matters. |
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espaeth
Digital Plumber
Premium,MVM
join:2001-04-21
Minneapolis, MN | 45KB/sec = 360kbps (8 bits per byte)
For those with standard 6/384 service that's about where things should land after your powerboost duration is up. |
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Swarms
@comcast.net
| Sorry, I should have mentioned, but I have the Performance Plus plan, which I believe is 768kbps upload? Which seems right, since for a long time I was getting a consistent 90KB/s. The powerburst also goes to around 190KB/s which is close to the 16mbps offered. |
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Cabal
Premium
join:2007-01-21
Boston, MA
1 edit | reply to nothing here
No problems outside Boston on 8/768 plan. 200 MB file upload:
275 KB/s during Powerboost
90-95 KB/s after Powerboost
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ccoggle
join:2001-08-06
Salt Lake City, UT
| reply to lperdue
So I came to the forum to find out about FTP throttling and found this thread...but my problems are actually with downloading...
I live in SLC and use Comcast at home. I have a box at a business connected via Fiber (Utopia). In the past I never had a problem transferring at outrageous speeds between the box. Lately, via FTP - each thread is getting throttled down to 100-150K. I can run multiple threads and get a full 800kish but - its annoying.
Transfers via HTTP yield full speed + powerboost. At first I thought it was something wrong with IIS - restarted it. Then I downloaded and installed a different FTP server - same problem.
So....I tried using VPN to connect to the machine, then transferred the data over VPN...bam...1500K+ speeds again.
So....any suggestions...or is it just being throttled? |
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jester121
Premium
join:2003-08-09
Lake Zurich, IL
 ·surpasshosting
·ViaTalk
| reply to lperdue
said by lperdue  : Comcast is throttling FTP uploads No, they aren't. Check your terms of service -- Comcast doesn't guarantee access to every nook and cranny on the internet at 6.0M/384K (or whatever speed you have).
If you're convinced they monitor threads and changed your settings once you were on to them, how did they know which account is yours? I bet they had to turn off all their throttling in Sonoma, CA, just in case. You're a hero! 
In other news: Comcast isn't liable for your alleged lost revenue unless it's in your contract (it isn't), any more than the electic company or any other service provider.
Oh, and good luck with small claims court. Step number one for a company being sued is to remove the case to district court -- get your lawyers fired up and ready to bill hours! |
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CraigB
@rr.com
thumbs down from:
Cabal
| My brother's Comcast upload got throttled in the last few months also. We exchange family pictures to each other using FTP. I used to see my brother's Comcast connection upload at near 1mb/sec. It now often uploads at 5kb to 15kb/sec. We can use other protocols to exchange pictures at the full 1mb/sec, its just FTP that is throttled. |
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deblin
Dark Side of the Moon
Premium,MVM
join:2001-09-01
Middletown, DE
| reply to Cabal
said by Cabal :No problems outside Boston on 8/768 plan. 200 MB file upload: 275 KB/s during Powerboost 90-95 KB/s after Powerboost My friend in Oregon had no problem pulling 700KB/s from me and pushing at 120KB/s on his plan. I had him test so I could add to this thread. Seems it's not a system-wide thing, though I doubt they are purposely throttling FTP anyway.
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Hello...is there anybody in there? |
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Bakla
@comcast.net
thumbs down from:
Cabal
| reply to lperdue
Use bit/Utorrent for awhile and shut it down and do FTP uploads,u will notice the throttling...it wont come off for awhile from the torrent usage aftermat hence affecting your FTP uploads.
to all the people who thinks COMCAST doesnt throttle are those people who never use torrent.
it's simple.
u use Torrent u get throttled
u dont use it...u dont. |
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