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Thread: Another new lappy

  1. #1
    Junior Member
    Join Date
    Oct 2001

    Another new lappy TCP Analyzer Results
    Tested on: 01.31.2007 10:50
    IP address:

    TCP options string: 020405b401010402
    MSS: 1460
    MTU: 1500
    TCP Window: 17520 (multiple of MSS)
    RWIN Scaling: 0
    Unscaled RWIN : 17520
    Reccomended RWINs: 64240, 128480, 256960, 513920
    BDP limit (200ms): 701kbps (88KBytes/s)
    BDP limit (500ms): 280kbps (35KBytes/s)
    MTU Discovery: ON
    TTL: 115
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)
    It has a intel coreduo 1.8/1 gig ram/Intel(R) PRO/Wireless 3945ABG Network Connection [NoDB]/Mobile Intel(R) 945GM Express/win xp pro sp2/linksys wrt54g wireless router

    compared to the suggested RWINs,17520 seems a bit small.

    our connection is supposed to be a 384dn/128 up. Charter pipeline.

    Thanks once again for your help.


  2. #2
    Elite Member trogers's Avatar
    Join Date
    Jan 2005
    Bangkok, Thailand
    Use the BDP formula to check for an appropriate RWIN:

    RWIN = Bandwidth x Max. Latency divided by 8 = 384 x 170 / 8 = 8160

    Normal Latency for users in the US is 90-130ms.

    So max latency = ave latency x 1.5 = 110 x 1.5 = 170ms

    The recommended RWIN values in TCP Analyzer are for 3 mbps bandwidth or more when max latency is 170ms.

    What speed are you getting? You can try lowering your RWIN to 8760 (MSS x 6) and see if that will help your speed.

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