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Thread: comcast affecting your traffic?

  1. #1
    madbeer's Avatar brewed locally BT Rep: +1
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    We all have heard the allegations, but I want to know if anyone can post hard evidence that comcast is really injecting TCP reset's due to p2p suspicion. At one point I thought I was falling victim to their evil RST's, but it turns out the other clients were just disconnecting and reconnecting to me (oddly -- and as far as I could tell). I live in baltimore, and right now am uploading at my advertised and paid for rate, and have been steadily for 10 hours.

    So do you think comcast is mangling your traffic? if so post some proof.

    I am still not sure about mine, and if I find anything conclusive I will post it here.

  2. BitTorrent   -   #2
    grimms's Avatar Excuse Me? BT Rep: +16BT Rep +16BT Rep +16BT Rep +16
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    Yes they do in fact inject fake RST packets into their bandwidth, which they provide you with when you subscribe to their internet service or bundled services. I use to work for them until recently. Yes they denied the allegations revolving around the use of "Sandvine" software which is used to monitor all bt traffic going through their network. The software was created by the company with the same name "Sandvine". Right now the FCC is investigating Comcast to see if their breaching Net Neutraility agreements and may be imposed with very harsh fines up to $195,000 per Comcast subscriber.
    Last edited by grimms; 01-18-2008 at 02:29 AM.

    Excuse Me?
    Didn't Think So!





  3. BitTorrent   -   #3
    madbeer's Avatar brewed locally BT Rep: +1
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    grimms is it happening to you on your home connection? It doesn't seem they are doing it to me in baltimore, but im not 100% sure ... yet

  4. BitTorrent   -   #4
    Zaxx's Avatar Ol' Skool P2P BT Rep: +3
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    All you could EVER want to know about CC and the forged RSTs...


    http://www.dslreports.com/forum/r183...2P-Connections

    Yes...I'm a CC customer too.
    Lucky for me, the day after the FCC started their investigation...my RST rate went from 80% to almost 0%! Imagine that. I'll spare you a huge rant...

    @madbeer...paste the following in notepad and save it as a .bat file. Once you finish d/ling a file and become a seed is when you'll get hit by sandvine...run this script to check your RST rate...let it run about 15 mins for a decent average.


    @ECHO OFF
    REM
    REM Title: NetStat Check Reset V3
    REM
    REM Description: Extract summary data from Netstat and display percentage of current, average and a histogram of connection resets.
    REM
    REM CURRENT percentages are the difference between the previous (20 seconds ago) and current Netstat results.
    REM AVERAGE percentages are the running total of the current percentages.
    REM HISTOGRAM is a ranking of the number of current percentages that occurred. This shows the distribution of resets from 1-99 percent.
    REM
    REM So while the Average percentage may be 35%, the Histogram may show the majority of Current percentages are in the 20% range
    REM with some spikes in the 40% or 50% range. This would indicate normal reset activity to be in the 20% range and the focus would be
    REM in resolving the spikes.
    REM

    SETLOCAL
    TITLE NetStat Check Reset V3
    CLS
    ECHO NetStat Check Reset Batch V3 [Ctrl-c quit]

    REM Initialize variables
    :init

    REM Histogram values
    SET HST00=0
    SET HST10=0
    SET HST20=0
    SET HST30=0
    SET HST40=0
    SET HST50=0
    SET HST60=0
    SET HST70=0
    SET HST80=0
    SET HST90=0

    REM Histogram print strings
    SET PST00=___
    SET PST10=___
    SET PST20=___
    SET PST30=___
    SET PST40=___
    SET PST50=___
    SET PST60=___
    SET PST70=___
    SET PST80=___
    SET PST90=___

    REM Loop counter for header print
    SET /A TESTCYCLE=-1

    REM run Netstat summary page, find line and save 2nd field value
    FOR /F "usebackq tokens=2 delims==" %%i IN (`netstat -s ^| find "Active Opens"`) DO SET /A PRVACTI=%%i
    FOR /F "usebackq tokens=2 delims==" %%i IN (`netstat -s ^| find "Passive Opens"`) DO SET /A PRVPASS=%%i
    FOR /F "usebackq tokens=2 delims==" %%i IN (`netstat -s ^| find "Failed Connection Attempts"`) DO SET /A PRVFAIL=%%i
    FOR /F "usebackq tokens=2 delims==" %%i IN (`netstat -s ^| find "Reset Connections"`) DO SET /A PRVRESE=%%i

    REM Begin loop section
    :begin

    REM Increment test cycles
    SET /A TESTCYCLE=%TESTCYCLE%+1
    IF %TESTCYCLE% GEQ 10 SET /A TESTCYCLE=0

    REM Ping to nul used as timer
    REM Each ping approximately 1 second delay
    REM Value of 20 used as minimum wait time for connection activity.
    REM
    ping -n 20 localhost >nul

    REM run Netstat summary page, find line and save 2nd field value
    FOR /F "usebackq tokens=2 delims==" %%i IN (`netstat -s ^| find "Active Opens"`) DO SET /A NXTACTI=%%i
    FOR /F "usebackq tokens=2 delims==" %%i IN (`netstat -s ^| find "Passive Opens"`) DO SET /A NXTPASS=%%i
    FOR /F "usebackq tokens=2 delims==" %%i IN (`netstat -s ^| find "Failed Connection Attempts"`) DO SET /A NXTFAIL=%%i
    FOR /F "usebackq tokens=2 delims==" %%i IN (`netstat -s ^| find "Reset Connections"`) DO SET /A NXTRESE=%%i

    REM Subtract Previous from Next to get Current
    SET /A CURACTI=%NXTACTI%-%PRVACTI%
    SET /A CURPASS=%NXTPASS%-%PRVPASS%
    SET /A CURFAIL=%NXTFAIL%-%PRVFAIL%
    SET /A CURRESE=%NXTRESE%-%PRVRESE%

    REM Accumulate the totals for averaging
    SET /A CUMACTI=%CUMACTI%+%CURACTI%
    SET /A CUMPASS=%CUMPASS%+%CURPASS%
    SET /A CUMFAIL=%CUMFAIL%+%CURFAIL%
    SET /A CUMRESE=%CUMRESE%+%CURRESE%

    REM Add Active and Passive connections then subtract Failed connections
    REM Calculate Percentage of Resets
    SET /A CURESTA=(%CURACTI%+%CURPASS%)-%CURFAIL%

    REM Bypass divide by zero errors
    SET /A CURPRCT=0
    IF %CURESTA% NEQ 0 SET /A CURPRCT=(%CURRESE%*100)/%CURESTA%

    REM Accumulate current results for session average
    SET /A CUMESTA=(%CUMACTI%+%CUMPASS%)-%CUMFAIL%

    REM Bypass divide by zero errors
    SET /A CUMPRCT=0
    IF %CUMESTA% NEQ 0 SET /A CUMPRCT=(%CUMRESE%*100)/%CUMESTA%

    REM Load histogram with current percentages in the range of 1-99%
    IF %CURPRCT% LEQ 0 GOTO display

    :break00
    IF %CURPRCT% GEQ 10 GOTO break10
    SET /A HST00=%HST00%+1
    SET PST00=%HST00%
    IF %HST00% LSS 10 SET PST00=_%PST00%
    IF %HST00% LSS 100 SET PST00=_%PST00%
    GOTO display

    :break10
    IF %CURPRCT% GEQ 20 GOTO break20
    SET /A HST10=%HST10%+1
    SET PST10=%HST10%
    IF %HST10% LSS 10 SET PST10=_%PST10%
    IF %HST10% LSS 100 SET PST10=_%PST10%
    GOTO display

    :break20
    IF %CURPRCT% GEQ 30 GOTO break30
    SET /A HST20=%HST20%+1
    SET PST20=%HST20%
    IF %HST20% LSS 10 SET PST20=_%PST20%
    IF %HST20% LSS 100 SET PST20=_%PST20%
    GOTO display

    :break30
    IF %CURPRCT% GEQ 40 GOTO break40
    SET /A HST30=%HST30%+1
    SET PST30=%HST30%
    IF %HST30% LSS 10 SET PST30=_%PST30%
    IF %HST30% LSS 100 SET PST30=_%PST30%
    GOTO display

    :break40
    IF %CURPRCT% GEQ 50 GOTO break50
    SET /A HST40=%HST40%+1
    SET PST40=%HST40%
    IF %HST40% LSS 10 SET PST40=_%PST40%
    IF %HST40% LSS 100 SET PST40=_%PST40%
    GOTO display

    :break50
    IF %CURPRCT% GEQ 60 GOTO break60
    SET /A HST50=%HST50%+1
    SET PST50=%HST50%
    IF %HST50% LSS 10 SET PST50=_%PST50%
    IF %HST50% LSS 100 SET PST50=_%PST50%
    GOTO display

    :break60
    IF %CURPRCT% GEQ 70 GOTO break70
    SET /A HST60=%HST60%+1
    SET PST60=%HST60%
    IF %HST60% LSS 10 SET PST60=_%PST60%
    IF %HST60% LSS 100 SET PST60=_%PST60%
    GOTO display

    :break70
    IF %CURPRCT% GEQ 80 GOTO break80
    SET /A HST70=%HST70%+1
    SET PST70=%HST70%
    IF %HST70% LSS 10 SET PST70=_%PST70%
    IF %HST70% LSS 100 SET PST70=_%PST70%
    GOTO display

    :break80
    IF %CURPRCT% GEQ 90 GOTO break90
    SET /A HST80=%HST80%+1
    SET PST80=%HST80%
    IF %HST80% LSS 10 SET PST80=_%PST80%
    IF %HST80% LSS 100 SET PST80=_%PST80%
    GOTO display

    :break90
    IF %CURPRCT% GEQ 100 GOTO break100
    SET /A HST90=%HST90%+1
    SET PST90=%HST90%
    IF %HST90% LSS 10 SET PST90=_%PST90%
    IF %HST90% LSS 100 SET PST90=_%PST90%
    GOTO display

    :break100

    REM Final formatting and print
    :display

    REM Assign values to print strings
    SET PCUMESTA=%CUMESTA%
    SET PCUMRESE=%CUMRESE%
    SET PCUMPRCT=%CUMPRCT%
    SET PCURESTA=%CURESTA%
    SET PCURRESE=%CURRESE%
    SET PCURPRCT=%CURPRCT%

    REM Skip leading zero for negative numbers
    IF %CUMESTA% LSS 0 GOTO dbreak1
    IF %CUMESTA% LSS 10 SET PCUMESTA=0%CUMESTA%
    :dbreak1

    IF %CUMRESE% LSS 0 GOTO dbreak2
    IF %CUMRESE% LSS 10 SET PCUMRESE=0%CUMRESE%
    :dbreak2

    IF %CURESTA% LSS 0 GOTO dbreak3
    IF %CURESTA% LSS 10 SET PCURESTA=0%CURESTA%
    :dbreak3

    IF %CURRESE% LSS 0 GOTO dbreak4
    IF %CURRESE% LSS 10 SET PCURRESE=0%CURRESE%
    :dbreak4

    REM Print line break and header every 10 cycles
    IF %TESTCYCLE% EQU 0 ECHO .
    IF %TESTCYCLE% EQU 0 ECHO %TIME% - CURRENT AVERAGE I 00%% I 10%% I 20%% I 30%% I 40%% I 50%% I 60%% I 70%% I 80%% I 90%% I

    REM Print Current percentage, Average Percentage and Histogram
    ECHO %TIME% - %PCURPRCT%%% (%PCURRESE%/%PCURESTA%) %PCUMPRCT%%% (%PCUMRESE%/%PCUMESTA%) I %PST00% I %PST10% I %PST20% I %PST30% I %PST40% I %PST50% I %PST60% I %PST70% I %PST80% I %PST90% I

    REM Save values into Previous
    SET /A PRVACTI=%NXTACTI%
    SET /A PRVPASS=%NXTPASS%
    SET /A PRVFAIL=%NXTFAIL%
    SET /A PRVRESE=%NXTRESE%

    REM Loop again
    GOTO begin
    Last edited by Zaxx; 01-18-2008 at 02:37 AM.
    "It's not what ya got, it's what you give."
    Please do not PM me for invites. Thx.


  5. BitTorrent   -   #5
    madbeer's Avatar brewed locally BT Rep: +1
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    Zaxx, I have read that thread.

    I was just hoping to get some testimonials directly from users here as to their experiences recently.

    Glad to hear your RST's are down to 0% though!!! Which method are/were you using to test?

  6. BitTorrent   -   #6
    Zaxx's Avatar Ol' Skool P2P BT Rep: +3
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    See edit above...
    "It's not what ya got, it's what you give."
    Please do not PM me for invites. Thx.


  7. BitTorrent   -   #7
    madbeer's Avatar brewed locally BT Rep: +1
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    I use OSX, and could write some python that monitors the resets (thanks for posting that script though), but how do you differentiate between legitimate resets and injected resets? I guess one shouldn't normally see shitloads of resets, right?

    well based on this wireshark capture filter posted on dslreports:

    (ip.src != your.own.ip.addrss) and (tcp.flags.reset ==1) and (tcp.seq >1) and (tcp.ack >1)and (tcp.dstport == BTlistenPort)

    I can happily say that I am not seeing any RST's!

    WOOOOOO
    Last edited by madbeer; 01-18-2008 at 04:47 AM. Reason: Automerged Doublepost

  8. BitTorrent   -   #8
    grimms's Avatar Excuse Me? BT Rep: +16BT Rep +16BT Rep +16BT Rep +16
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    Yes it did happen to me and i switched providers. There are work arounds but none of them are 100% safe proof. Comcast still monitors it's users and bt traffic. Even if you have forced encryption enabled in bt clients. Zaxx posted a bat.file that could prove real useful. As far as hard evidence?... the FCC will have to ultimately decide that.

    My bandwidth was raped and RST packets altered when i was with Comcast. I'm happy I switched providers. Do miss their on-demand service though. Lucky for me though i don't watch that much tv anymore, if at all.

    Quote Originally Posted by madbeer View Post
    grimms is it happening to you on your home connection? It doesn't seem they are doing it to me in baltimore, but im not 100% sure ... yet
    Once your bandwidth usage reaches a certain threshold (That Comcast pre determines for every subscriber, depending on ISP package), Comcast throttles the bandwidth they provide to you to significantly hinder the bandwidth they give to you to lower cost incurred to them, due to your usage. So they send forged RST to packets through your connection. If it hasn't happened to you yet. evenually it will.
    Last edited by grimms; 01-18-2008 at 07:03 AM. Reason: Automerged Doublepost

    Excuse Me?
    Didn't Think So!





  9. BitTorrent   -   #9
    Zaxx's Avatar Ol' Skool P2P BT Rep: +3
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    Actually sandvine doesn't care which package you subscribe to..the only question is whether or not your node is connected to sandvine. Business accounts however are not hit. Since sandvine does not kick in until you become a seed, getting your files (and getting a warning for using 480GB in 1 month ) is no problem...it's seeding back that is nearly impossible if your under the 'full throttle-back' of sandvine. Some report 20% rst rate some 60%-80%..some get high rst rates during peak hours only, some get hammered 24/7. It varies from area to area and can change whenever...
    "It's not what ya got, it's what you give."
    Please do not PM me for invites. Thx.


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