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Thread: unstable connection. Help if you can

  1. #1
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    Question unstable connection. Help if you can

    Hi!

    I have a problem with my connection (provider).

    I have 2 Mbps connection but it doesn't work correctly.

    My problem:

    I can download with approximately 1 Mbps. I thought that my brandwitdh is lower but i watched it with bandwitdh monitor and noticed my download speed was jumping between 30 kbyte/sec and 220 kbyte/sec. And tha average written by download window is the 1Mbps. (lol Microsoft)

    It is the same if i use speedtests...


    And the most nerve-racking thing that i can't use games (called e.g. PES5 and Diablo2) which uses only 2-300 kbps bandwitdh...

    The bandwitdh problem hase been for 6 months. I told to the provider but never do anyting just "increasing bandwitdh"...
    But i could play with PES correctly until a week ago...

    But last wednesday they exchange my modem (effect of my complaints) and the situation become worse! Now i can't play with PES5 with my friends whom i can play well enough before modem exchangeing with...
    I have pritty much lagg and the game is unenjoyable.

    What could happened?

    I have written some letters to the provider to change back my modem but i would like to do if my computer or settings is too bad to make my modem work correctly... But i don't think so... I need only 300 kbps for the PES and PES is lagging with the new modem...

    And i can download with 1 Mbps but my bandwitdh graph is lol...

    I tried it with windows default and optimized settings (and custom optimized)... Nothing changed in lagg effect, just better download with optimized... (but also jumping)

    Maybe just modem sucks (how could it happened??) or somehow i can help to the computer?


    Thx the Attention!

    Peti

  2. #2
    Elite Member trogers's Avatar
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    When you changed your modem, your MTU may have also changed. Do this test and post your results:

    http://www.speedguide.net/analyzer.php

  3. #3
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    Quote Originally Posted by trogers
    When you changed your modem, your MTU may have also changed. Do this test and post your results:

    http://www.speedguide.net/analyzer.php

    When i changed my modem, i used also the tcp optimizer to optimize my MTU
    (1480) and RWIN (86000)


    With the previous modem the MTU was 1492...

    In that time was also the connection problem...



    After that to my friend's advice i installed the cfos 3.01, and permited for them to optimize my TCP ... And that's the result:


    TCP options string = 020405800103030301010402

    MTU = 1448
    MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. If you are using a router, it could be limiting your MTU regardless of Registry settings.

    MSS = 1408
    MSS is not optimized for broadband. Consider increasing your MTU value.

    Default TCP Receive Window (RWIN) = 123904
    RWIN Scaling (RFC1323) = 3 bits (scale factor of 6)
    Unscaled TCP Receive Window = 15488

    RWIN is a multiple of MSS
    Other RWIN values that might work well with your current MTU/MSS:
    518144 (MSS x 46 * scale factor of 8)
    259072 (MSS x 46 * scale factor of 4)
    129536 (MSS x 46 * scale factor of 2)
    64768 (MSS x 46)

    bandwidth * delay product (Note this is not a speed test):

    Your TCP Window limits you to: 4956.16 kbps (619.52 KBytes/s) @ 200ms
    Your TCP Window limits you to: 1982.464 kbps (247.808 KBytes/s) @ 500ms

    MTU Discovery (RFC1191) = ON

    Time to live left = 58 hops
    TTL value is ok.

    Timestamps (RFC1323) = OFF
    Selective Acknowledgements (RFC2018) = ON

    IP type of service field (RFC1349) = 00000000 (0)



    So i think the CFOS's settings is worse than the TCP optimizer's, isn't it?

    I will set back to the original settings... 1480 and 86000 RWIN...

    86k is a quite good decision to my internet.

    My download speed is 2048kbps on paper, but now... It reach 2Mbps but the jumping is awful...

    And i don't know why.

    I set back and write the correct result

  4. #4
    Elite Member trogers's Avatar
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    Use TCP Optimizer with the following settings:

    General Settings tab:
    Custom settings - check
    Modify All Network Adapters - check
    network adapter selection - your NIC
    MTU 1480
    TTL - 64
    TCP Receive Window -63360
    MTU Discovery - Yes
    Black Hole Detect - No
    Selective Acks - Yes
    Max Duplicate ACKs - 2
    TCP 1323 Options:
    Windows Scaling - uncheck
    Timestamps - uncheck
    Advanced Settings tab:
    Max Connections per Server - 10
    Max Connections per 1.0 Server - 20
    LocalPriority - 5
    Host Priority - 6
    DNSPriority - 7
    NetbtPriority - 8
    Lan Browsing speedup - optimized
    QoS: NonBestEffortLimit - 0
    ToS: DisableUserTOSSetting - 0
    ToS: DefaultTOSValue - 80
    MaxNegativeCacheTtl - 0
    NetFailureCacheTime - 0
    NegativeSOACache Time - 0
    LAN Request Buffer Size - 32768
    Then select "Apply Changes" and reboot to take effect

    If you play online games and need to lower your download speed near to your upload speed, use

    TCP Receive Window -8640 (=MSS x 6)

    and your download speed should be within 500-600 kbps.

  5. #5
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    Hm, thx, i will try it.

    But you know that before modem changing the connection of the online game was very good.

    But the jumping alse appeared... (that is my great problem)

    so you cannot say anything about the download jumping...


    Here is a graph (with Bandidth Monitor Pro):




    And i use CFOS with traffic shaping.

    But i will try it with your settings. PES needs only 3-400 kbps download ...
    But i think it should work with default optimized settings... And the jumpings are grrrr...

    I hope it will be better.. But i asked my provider to give me another modem (or the previous one..)


  6. #6
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    I applied your settings.

    If i use game i will decrease MSS*6 my RWIN if it not good enough.

    Thx!

    I will test it and post again.. in the next 3-4 days .


    Now it is:

    TCP options string = 020405a001010402

    MTU = 1480
    MTU is optimized for Windows XP PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.

    MSS = 1440
    MSS is optimized for Windows XP PPPoE DSL broadband. If not, consider raising your MTU value.

    Default TCP Receive Window (RWIN) = 63360
    RWIN Scaling (RFC1323) = 0 bits
    Unscaled TCP Receive Window = 63360

    RWIN is a multiple of MSS
    Other RWIN values that might work well with your current MTU/MSS:
    506880 (MSS x 44 * scale factor of 8)
    253440 (MSS x 44 * scale factor of 4)
    126720 (MSS x 44 * scale factor of 2)
    63360 (MSS x 44) <-- current value

    bandwidth * delay product (Note this is not a speed test):

    Your TCP Window limits you to: 2534.4 kbps (316.8 KBytes/s) @ 200ms
    Your TCP Window limits you to: 1013.76 kbps (126.72 KBytes/s) @ 500ms

    MTU Discovery (RFC1191) = ON

    Time to live left = 58 hops
    TTL value is ok.

    Timestamps (RFC1323) = OFF
    Selective Acknowledgements (RFC2018) = ON

    IP type of service field (RFC1349) = 01010000 (80)
    Precedence (priority) = 010 (immediate)
    Delay = 1 (low delay)
    Throughput = 0 (normal throughput)
    Reliability = 0 (normal reliability)
    Cost = 0 (normal cost)
    Check bit = 0 (correct, 8th checking bit must be zero)

    DiffServ (RFC 2474) = AF22 010100 (20) - Assured Forwarding class 2, medium drop precedence (RFC 2597).





    1 question:

    Why theese questions are good??


    QoS: NonBestEffortLimit - 0
    ToS: DisableUserTOSSetting - 0
    ToS: DefaultTOSValue - 80


    What is the advantage from zero values?

    thx!

  7. #7
    Elite Member trogers's Avatar
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    Quote Originally Posted by horpeti

    1 question:

    Why theese questions are good??


    QoS: NonBestEffortLimit - 0
    ToS: DisableUserTOSSetting - 0
    ToS: DefaultTOSValue - 80


    What is the advantage from zero values?

    thx!
    The answer is in item 4 of this link (Type/Quality of Service):

    http://www.speedguide.net/tcpoptimizer.php#advanced_qos

  8. #8
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    Yes, i have read about that but didn't want to try it

    Well, what about 136 and 184?

    Is it too much risk?

  9. #9
    Elite Member trogers's Avatar
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    There is no risk involved. You can use TCP Optimizer to experiment with different settings and test performance to find the ones that work best for you.

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