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Thread: Recently upgraded to 8mbps. Suggested tweaks please.

  1. #1
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    Recently upgraded to 8mbps. Suggested tweaks please.

    Hi guys.

    I just recently upgraded to the new Kingston Communications Karoo BB service, 8mbps and am looking into maximizing my speed.

    The only real changes I have made so far is upgrading my Netgear DG834G router to the latest firmware as i'm worried about messing things up.

    Here are my current details.

    TCP options string = 0204058a01010402

    MTU = 1458
    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 = 1418
    Maximum useful data in each packet = 1418, which equals MSS.

    Default TCP Receive Window (RWIN) = 65535
    RWIN Scaling (RFC1323) = 0 bits
    Unscaled TCP Receive Window = 65535

    Note: TCP 1323 Options need to be enabled for RWIN over 2^16 (65535). Windows 9x might also need the MS Vtcp386 fix.
    For optimum performance, consider changing RWIN to a multiple of MSS.
    Other RWIN values that might work well with your current MTU/MSS:
    521824 (MSS x 46 * scale factor of 8)
    260912 (MSS x 46 * scale factor of 4)
    130456 (MSS x 46 * scale factor of 2)
    65228 (MSS x 46)

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

    Your TCP Window limits you to: 2621.4 kbps (327.675 KBytes/s) @ 200ms
    Your TCP Window limits you to: 1048.56 kbps (131.07 KBytes/s) @ 500ms

    MTU Discovery (RFC1191) = ON

    Time to live left = 117 hops
    TTL value is ok.

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

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



    Any help would be great!

    Thanks in advance.

  2. #2
    Elite Member trogers's Avatar
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    What speedtest results are you currently getting when tested at websites in your country?

  3. #3
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    Quote Originally Posted by trogers View Post
    What speedtest results are you currently getting when tested at websites in your country?
    Hi,

    I ran a test:

    Speed
    878.1 kilobits per second

    Communications 878.1 kilobits per second
    Storage 107.2 kilobytes per second
    1MB file download 9.6 seconds
    Subjective rating Good

    Info
    Date & time Tuesday, November 21, 8:52AM*
    Connection type ADSL
    Region United Kingdom
    Data size 1024KB


    I'm getting around 100 KB/sec when i download on average.
    Last edited by teamdoa; 11-21-06 at 07:57 AM.

  4. #4
    Elite Member trogers's Avatar
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    Use these custom settings with TCP Optmizer:

    General Settings tab:
    Custom settings - check
    Modify All Network Adapters - check
    network adapter selection - your NIC
    MTU - 1458
    TTL - 64
    TCP Receive Window - 260912
    MTU Discovery - Yes
    Black Hole Detect - No
    Selective Acks - Yes
    Max Duplicate ACKs - 2
    TCP 1323 Options:
    Windows Scaling - checked
    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 - 136
    MaxNegativeCacheTtl - 0
    NetFailureCacheTime - 0
    NegativeSOACache Time - 0
    LAN Request Buffer Size - 32768
    Then select "Apply Changes" and reboot to take effect

    How much of the 8 mbps you are able to achieve depends much on your distance to the central office of the ISP. See this pic for explanation:


  5. #5
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    Thanks for your help!

    Just out of interest, is the MTU setting correct as I have noticed most people saying it should be set to 1500?

    Mine is PPoA (PPP over ATM) LLC Based.
    Last edited by teamdoa; 11-21-06 at 11:06 AM.

  6. #6
    Elite Member trogers's Avatar
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    Quote Originally Posted by teamdoa View Post
    Just out of interest, is the MTU setting correct as I have noticed most people saying it should be set to 1500?

    Mine is PPoA (PPP over ATM) LLC Based.
    What speed are you getting now?

    You can try to increase your MTU using the following with TCP Optimizer:

    General Settings tab:
    Custom settings - check
    Modify All Network Adapters - check
    network adapter selection - your NIC
    MTU - 1500
    TTL - 64
    TCP Receive Window - leave blank
    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 - 136
    MaxNegativeCacheTtl - 0
    NetFailureCacheTime - 0
    NegativeSOACache Time - 0
    LAN Request Buffer Size - 32768
    Then select "Apply Changes" and reboot to take effect

  7. #7
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    Hi,

    I was getting about the same speed. I will try your new tweak, thanks!

    What would you expect roughly for an 8 Mbps connection?

    I am currently getting about 110 KB/s on downloads.

  8. #8
    Elite Member trogers's Avatar
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    If you are located within 1.5km from your ISP you should be getting about 80% of your subscribed speed at this time (it is now 6pm in the UK) and 90% between 4-6am.

    So 80% of 8 mbps = 6.4mbps or 800 KB/s.

    After you can adjust your MTU to 1500, you will need to adjust your RWIN to 256960.

  9. #9
    Elite Member trogers's Avatar
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    Make sure your modem is placed a few feet away from the router or other electrical devices such as speakers, sub-woofer, cordless phone, etc.

    Tips to optimise wireless connections are available in the Wireless Networking section of our forum.

  10. #10
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    Quote Originally Posted by trogers View Post
    Make sure your modem is placed a few feet away from the router or other electrical devices such as speakers, sub-woofer, cordless phone, etc.

    Tips to optimise wireless connections are available in the Wireless Networking section of our forum.
    Awesome, I seem to be making progress.


    Communications 1.6 megabits per second
    Storage 197.2 kilobytes per second
    1MB file download 5.2 seconds
    Subjective rating Great

    Info
    Date & time Tuesday, November 21, 1:57PM*
    Test type IDT4 Free
    Connection type ADSL
    Region United Kingdom
    Data size 1024KB


    Trouble is, I did have a cordless phone near my router...so Im not sure if just removing that made the difference or the setting changes.

    Thanks for your help again.

  11. #11
    Elite Member trogers's Avatar
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    Here is a tip from the Wireless Networking section:

    http://www.speedguide.net/faq_in_q.p...ory=91&qid=158

    What factors impact WiFi performance ?

    Wireless networks' performance is affected by a variety of factors, such as the distance between nodes, walls/obstacles that obstruct direct line-of-sight, and other wireless traffic in the general area (such as the presence of 802.11b devices in the 802.11g network, or the presence proprietary non-standard WiFi technologies).

    Cordless phones, bluetooth devices, microwaves, and anything that may cause interference in the 2.4GHz frequency range can affect the WLAN performance as well.
    In addition, cordless phone will also impact on your modem. It is a good idea to use a line phone instead and connect the cordless phone in some other room.

  12. #12
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    Thing is, my network, router isnt wireless.

    Anyway, its works now, so thats great.

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