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Thread: Don't understand Analyser results

  1. #1
    Junior Member
    Join Date
    Oct 2005

    Question Don't understand Analyser results

    Hi all,

    I was hoping someone could help me.

    I am running Windows XP Home Edition SP2, IE6 SP2.

    I am using a Billion 7402VL Modem/Router with the latest firmware (5.04c.dg1).

    I am connected to Exetel DSL 512/128 (Sydney, Australia) which I understand uses PPPoE.

    I downloaded SG TCP_Optimiser 2.0.2 and ran it, selecting the "Optimum Settings" radio button, and with the "Modify All Network Adapters" and PPPoE check-boxes selected.

    I then checked the MTU setting using the Router's management software: Config -> WAN -> ipwan-> edit, and found that the MTU was set to 1492 as the SG TCP_Optimiser says it should be.

    Why then do I get the following results when I run the SG TCP/IP Analyser?

    TCP options string = 020405840103030001010402
    MTU = 1452
    MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput.
    MSS = 1412
    MSS is not fully optimized for broadband (although it might work well for slower connections). Consider increasing your MTU value.

    Default Receive Window (RWIN) = 58220
    RWIN Scaling (RFC1323) = 0 bits
    Unscaled Receive Window = 58220

    For optimum performance, consider changing RWIN to a multiple of MSS.
    Other values for RWIN that might work well with your current MTU/MSS:
    519616 (MSS x 46 * scale factor of 8)
    259808 (MSS x 46 * scale factor of 4)
    129904 (MSS x 46 * scale factor of 2)
    64952 (MSS x 46)
    bandwidth * delay product (Note this is not a speed test):

    Your RcvWindow limits you to: 2328.8 kbps (291.1 KBytes/s) @ 200ms
    Your RcvWindow limits you to: 931.52 kbps (116.44 KBytes/s) @ 500ms
    MTU Discovery (RFC1191) = OFF
    Time to live left = 55 hops

    TTL value is ok.
    Timestamps (RFC1323) = OFF
    Selective Acknowledgements (RFC2018) = ON
    IP type of service field (RFC1349) = 00000000 (0)

    Have I missed doing something with my tweaking? Is there something else I should be doing? Is something going wrong with the Analyser? Does any of this really affect the performance anyway?

    Many thanks to anyone who can offer help.

  2. #2
    Second Most EVIL YARDofSTUF's Avatar
    Join Date
    Nov 2000
    The MTU in your modem's router config could be set lower, I'd look there.

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