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Thread: TTL vs RWIN

  1. #1

    TTL vs RWIN

    Here the choose

    Smaller RWIN with Bigger TTL Hops or

    Bigger RWIN with Smaller TTL Hops ?

    pino

  2. #2
    Senior Member earthmofo's Avatar
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    It doesn't matter.

    TTL or Time To Live is the number of hops (servers) a packet can travel to it's destination before it's dropped.

    RWIN determines how much data the receiving computer can get and is not dependent on TTL.
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  3. #3
    How the relation for speed ?

    Because from TCP Op or DRTCP said you must set RWIN and TTL for optimized but we can't get really according to environment ?

    pino

  4. #4
    Dr Tweak mnosteele52's Avatar
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    TTL is pretty much irrelevant to speed, RWIN has the most effect on speed and is based on your caps and possible latency.

  5. #5
    So for experiment we must set TTL to deffault (e.g 64 for Win98) and we only change RWIN ?

    pino

  6. #6
    Dr Tweak mnosteele52's Avatar
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    You got it, RWIN has the most effect on your speed.

  7. #7
    I'll try !

    tnx , pino

  8. #8
    TCP/IP Dude rmrucker's Avatar
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    You don't want TTL too low with a large RWIN -- there will be a critical point if your RWIN greatly exceeds your bandwidth.

    Think about it. If you have a HUGE RWIN and small bandwidth, the packets will have left the server and will be sitting in limbo for a long time waiting to get through the narrow pipe. If they sit in limbo too long, TTL will be exceeded.

  9. #9
    Idolized Industry Killer §I€MFKR™'s Avatar
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    Originally posted by rmrucker
    You don't want TTL too low with a large RWIN -- there will be a critical point if your RWIN greatly exceeds your bandwidth.

    Think about it. If you have a HUGE RWIN and small bandwidth, the packets will have left the server and will be sitting in limbo for a long time waiting to get through the narrow pipe. If they sit in limbo too long, TTL will be exceeded.
    OK, What would be a good setting for a large RWIN like 3584000?
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