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Is RWIN something to screw with ???

Discussion in 'Hardware' started by bxmag, Nov 19, 2001.

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  1. bxmag

    bxmag Thread Starter

    Joined:
    Aug 19, 2001
    Messages:
    76
    SpeedGuide.net TCP/IP Analyzer
    TCP properties for IP = 24.188.97.141 ()
    Note: Read the FAQ if the above is not your IP address.
    Browser/OS = Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; Win 9x 4.90)

    TCP options string = 020405b401010402

    MTU = 1500
    MTU is fully optimized for broadband.

    MSS = 1460
    Maximum useful data in each packet = 1460, which is equal to MSS.

    Default Receive Window (RWIN) = 17520
    RWIN Scaling (RFC1323) = 0 bits
    Unscaled Receive Window = 17520
    RWIN is a multiple of MSS
    Other values for RWIN that might work well with your current MTU/MSS:
    513920 (MSS x 44 * scale factor of 8)
    256960 (MSS x 44 * scale factor of 4)
    128480 (MSS x 44 * scale factor of 2)
    64240 (MSS x 44)

    bandwidth * delay product:
    Your RcvWindow limits you to: 700.8 kbps (87.6 KBytes/s) @ 200ms
    Your RcvWindow limits you to: 280.32 kbps (35.04 KBytes/s) @ 500ms
    Consider increasing your RWIN value to optimize TCP/IP for broadband.

    MTU Discovery (RFC1191) = ON

    Time to live left = 116 hops
    TTL value is ok.

    Timestamps (RFC1323) = OFF

    Selective Acknowledgements (RFC2018) = ON

    IP type of service field (RFC1349)= 00000000


    I have tested my connection speeds on two different sites and both recommend adjusting RWIN, Is this worth the troble or leave it alone ??


    thanks
    Danny
     
  2. brianF

    brianF

    Joined:
    Dec 2, 1999
    Messages:
    12,041
    I use there patches to update the registry settings for cable modem. Always increased performance as far as I have seen.
    Yes increasing rwin will speed things up

    TCP options string = 020405b40103030201010402

    MTU = 1500
    MTU is fully optimized for broadband.

    MSS = 1460
    Maximum useful data in each packet = 1460, which is equal to MSS.

    Default Receive Window (RWIN) = 256960
    RWIN Scaling (RFC1323) = 2 bits
    Unscaled Receive Window = 64240
    RWIN is a multiple of MSS
    Other values for RWIN that might work well with your current MTU/MSS:
    513920 (MSS x 44 * scale factor of 8)
    128480 (MSS x 44 * scale factor of 2)
    64240 (MSS x 44)

    bandwidth * delay product:
    Your RcvWindow limits you to: 10278.4 kbps (1284.8 KBytes/s) @ 200ms
    Your RcvWindow limits you to: 4111.36 kbps (513.92 KBytes/s) @ 500ms

    MTU Discovery (RFC1191) = ON

    Time to live left = 53 hops
    TTL value is ok.

    Timestamps (RFC1323) = OFF

    Selective Acknowledgements (RFC2018) = ON

    IP type of service field (RFC1349)= 00000000
     
  3. Davey7549

    Davey7549

    Joined:
    Feb 28, 2001
    Messages:
    11,584
    Brian
    Just tagging along and decided to do the tweaks since I have cable. When I went to set maxmtu=1500 this is what I found in the registry. Its not there should I be looking elsewhere?
    Dave
     

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  4. brianF

    brianF

    Joined:
    Dec 2, 1999
    Messages:
    12,041
    No, just download and run the mtupatch for your os from the speedguide patch page. It will install the key
    First time I did it I did it manually, big pain, now I just run the patches, works for me and everyone else I know that has used them.
     
  5. Davey7549

    Davey7549

    Joined:
    Feb 28, 2001
    Messages:
    11,584
    Thanks Brian Saved allot of key strokes to add new keys.
    All the settings were changed except MTU even though the key is set to 1500. That I believe is because I am hiding behind a Router. We will see what difference there is.
    Thanks again guys!
    Dave
     
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