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Thread: Slow ADSL 2+ Need Help Please

  1. #1
    Junior Member
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    Jul 2007
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    Slow ADSL 2+ Need Help Please

    Connected to Optusnet ADSL 2+ (ISP - Australia) earlier this week but have found the download speeds to be extremely slow at all times, especially on international routes, i.e only slightly better than previously connection with 1.5mbps line.

    Information:
    Distance to exchange is 430m, Cable distance 720m/s.
    Speedtest results
    13968kb/s Download, 569kb/s Upload
    Latency 28ms

    Installed Tcp/Ip Optimizer with no real difference.

    SpeedGuide.net TCP Analyzer Results
    Tested on: 07.28.2007 01:19
    IP address: 58.110.xxx.xxx

    TCP options string: 020405ac0103030401010402
    MSS: 1452
    MTU: 1492
    TCP Window: 1028016 (multiple of MSS)
    RWIN Scaling: 4
    Unscaled RWIN : 64251
    Reccomended RWINs: 63888, 127776, 255552, 511104
    BDP limit (200ms): 41121kbps (5140KBytes/s)
    BDP limit (500ms): 16448kbps (2056KBytes/s)
    MTU Discovery: ON
    TTL: 48
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

    Any help will be appreciated. Thank you.

  2. #2
    Elite Member trogers's Avatar
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    Bangkok, Thailand
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    Try the following with TCP Optimizer:

    General Settings tab:
    Custom settings - check
    Modify All Network Adapters - check
    network adapter selection - your NIC
    MTU 1492
    TTL - 64
    TCP Receive Window - 511104
    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 - 1
    Host Priority - 1
    DNSPriority - 1
    NetbtPriority - 1
    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

  3. #3
    Junior Member
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    Thanks for the quick response.

    New settings doesn't appear to have any difference. Could it be due to the ISP?

    New Speedtest Results: 12996kb/s Download, 565kb/s Upload, Latency 28ms

    SpeedGuide.net TCP Analyzer Results
    Tested on: 07.28.2007 02:01
    IP address: 58.110.xxx.xxx

    TCP options string: 020405ac0103030301010402
    MSS: 1452
    MTU: 1492
    TCP Window: 511104 (multiple of MSS)
    RWIN Scaling: 3
    Unscaled RWIN : 63888
    Reccomended RWINs: 63888, 127776, 255552, 511104
    BDP limit (200ms): 20444kbps (2556KBytes/s)
    BDP limit (500ms): 8178kbps (1022KBytes/s)
    MTU Discovery: ON
    TTL: 48
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

  4. #4
    Elite Member trogers's Avatar
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    Location
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    Quote Originally Posted by MrRiku View Post
    Thanks for the quick response.

    New settings doesn't appear to have any difference. Could it be due to the ISP?

    New Speedtest Results: 12996kb/s Download, 565kb/s Upload, Latency 28ms
    The slight fall in speed may be due to traffic condition of the network.

    Check the ADSL status of your router to see what line speed it register. Your tested speed would probably be within 85-90% of that.

  5. #5
    Junior Member
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    Speed Results from Modem:
    19586kb/s Download
    812kb/s Upload

    The above are average figures, but what I don't understand is why the extreme slow download speeds.

    You are probably correct in saying that the reduction in speed is due to heavier traffic.

    Am using the supplied Isp modem Siemens 4200. Do you think a change in modem, perhaps the Belkin N1 Modem/Router, will improve download speeds?

    Is there anything else I should do or can do to improve the situation?

    Thanks again.

  6. #6
    Elite Member trogers's Avatar
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    Quote Originally Posted by MrRiku View Post
    Speed Results from Modem:
    19586kb/s Download
    812kb/s Upload

    The above are average figures, but what I don't understand is why the extreme slow download speeds.

    You are probably correct in saying that the reduction in speed is due to heavier traffic.

    Am using the supplied Isp modem Siemens 4200. Do you think a change in modem, perhaps the Belkin N1 Modem/Router, will improve download speeds?

    Is there anything else I should do or can do to improve the situation?

    Thanks again.
    What kind of firewall, antivirus or security suite are you using? Some are known to cause slowdowns.

    Do a tracert to www.yahoo.com and post.

    To do a tracert, click 'Start' and then 'Run'. Type "cmd" into the box and click 'ok'.

    A DOS black screen will appear. Type after the C:\>

    tracert www.yahoo.com

    and press enter key

    When test is completed, move mouse cursor to the DOS black screen, click right and choose 'select all'.

    Move mouse cursor to the Quick Reply box of this forum, click right and 'paste'.

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