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Thread: Slow DSL Download speed (fine upload speed)

  1. #1
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    Slow DSL Download speed (fine upload speed)

    Were paying for an upto 16Mb connection (full 16Mb isn't available yet, we should be getting around 2Mb though).

    The router/modem says:

    DownStream Connection Speed 1952 kbps
    UpStream Connection Speed 448 kbps

    ...which sounds about right! However, on speedtest.net (or any other speed test site) or downloading from a fast FTP, the rated speed is around:

    Download Speed 180Kbps
    Upload Speed 300Kbps

    The upload speed seems about right, but the download speed is clearly wrong, especially since we were getting around 200KBps a few months ago.

    The results are the same on all computers on the network (Windows XP, Vista, Linux and Mac) and are the same when the device is connected directly to the modem. Tried moving the modem away from electrical sources too with no luck.

    Any ideas? My only thought at the moment is a dodgey modem

  2. #2
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    Update:

    I connected the modem to the socket behind the faceplate on the master phone socket. Sync'd up at 4000Mbps, however still getting < 256Kbps on downloads

  3. #3
    Elite Member trogers's Avatar
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    Post a TCP Analyzer report.
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

  4. #4
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    SpeedGuide.net TCP Analyzer Results
    Tested on: 12.17.2008 11:29
    IP address: 212.32.xx.xxx

    TCP options string: 020405ac0103030201010402
    MSS: 1452
    MTU: 1492
    TCP Window: 66792 (multiple of MSS)
    RWIN Scaling: 2 bits (2^2=4)
    Unscaled RWIN : 16698
    Recommended RWINs: 63888, 127776, 255552, 511104, 1022208
    BDP limit (200ms): 2672kbps (334KBytes/s)
    BDP limit (500ms): 1069kbps (134KBytes/s)
    MTU Discovery: ON
    TTL: 114
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

  5. #5
    Elite Member trogers's Avatar
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    Quote Originally Posted by mojo8472 View Post
    SpeedGuide.net TCP Analyzer Results
    Tested on: 12.17.2008 11:29
    IP address: 212.32.xx.xxx

    TCP options string: 020405ac0103030201010402
    MSS: 1452
    MTU: 1492
    TCP Window: 66792 (multiple of MSS)
    RWIN Scaling: 2 bits (2^2=4)
    Unscaled RWIN : 16698
    Recommended RWINs: 63888, 127776, 255552, 511104, 1022208
    BDP limit (200ms): 2672kbps (334KBytes/s)
    BDP limit (500ms): 1069kbps (134KBytes/s)
    MTU Discovery: ON
    TTL: 114
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)
    You are using Vista which is autotuning.

    Check signal quality. Do a tracert to www.yahoo.com and post.
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

  6. #6
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    Tracing route to www.yahoo-ht3.akadns.net [87.248.113.14]
    over a maximum of 30 hops:

    1 1 ms 1 ms 1 ms DD-WRT [192.168.1.2]
    2 2 ms 2 ms 1 ms 192.168.0.1
    3 35 ms 34 ms 34 ms lon-gs2dgw.spn.kcom.com [217.154.130.40]
    4 131 ms 210 ms 208 ms ge-4-1.lon-th1br.spn.kcom.com [217.154.71.2]
    5 43 ms 39 ms 38 ms ge-3-3-0.pat1.tc2.yahoo.com [195.66.226.129]
    6 47 ms 50 ms 51 ms so-0-1-0.msr2.ird.yahoo.com [217.146.181.223]
    7 47 ms 49 ms 46 ms ge-1-8.bas-b1.ird.yahoo.com [87.248.101.245]
    8 47 ms 51 ms 49 ms f1.us.www.vip.ird.yahoo.com [87.248.113.14]

    Trace complete.

  7. #7
    Elite Member trogers's Avatar
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    Quote Originally Posted by mojo8472 View Post
    Tracing route to www.yahoo-ht3.akadns.net [87.248.113.14]
    over a maximum of 30 hops:

    1 1 ms 1 ms 1 ms DD-WRT [192.168.1.2]
    2 2 ms 2 ms 1 ms 192.168.0.1
    Your have connected your router to a modem that already has a built-in router, resulting in a double NAT connection.

    You need to set your modem into bridge mode to turn off its router.
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

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