P flag

Discussion in 'Cisco' started by vertigo, Jun 28, 2006.

  1. vertigo

    vertigo Guest

    Hello

    What is P (Push) flag in TCP used in real life ?
    Could cisco block such packets somehow ?

    Thanx
    Michal
     
    vertigo, Jun 28, 2006
    #1
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  2. vertigo

    Guest

    , Jun 30, 2006
    #2
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  3. vertigo

    SAto Guest

    vertigo skrev:
    > Hello
    >
    > What is P (Push) flag in TCP used in real life ?
    > Could cisco block such packets somehow ?


    Normally a TCP host is allowed to buffer data.
    The TCP push flag forces it to hand the data over to upper level
    applications right away insted of buffering it. (it is still allowed to
    delay acknowledgements though.)

    This is from the RFC:
    ---
    A sending TCP is allowed to collect data from the sending user and to
    send that data in segments at its own convenience, until the push
    function is signaled, then it must send all unsent data. When a
    receiving TCP sees the PUSH flag, it must not wait for more data from
    the sending TCP before passing the data to the receiving process.
    ---

    Citrix and RDP for example use this to update the client.

    -SAto
     
    SAto, Jun 30, 2006
    #3
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