Re: Difference between Urgent and Push bit

>However the urgent flag is probably used when you want to convey
this message to the application.

"TCP/IP Illustrated, Volume 1" (Stevens) offers examples of Urgent
mode in Chapters 26 & 27 (and it's discussed in general terms in
Chapter 20). Fair warning: this is an obviously somewhat dated text
(copyright 1994) and the examples are very, very dry. Here's a quote
from Ch 20:

"What is urgent mode used for? The two most commonly used
applications are Telnet and Rlogin, when the interactive user types
the interrupt key, and we show examples of this use of urgent mode in
Chapter 26. Another is FTP, when the interactive user aborts a file
transfer, and we show an example of this in Chapter 27."

And an interesting quote from the same chapter relative to the Push
flag:

"Berkley-derived implementations ignore a received PUSH flag because
they normally never delay the delivery of received data to the
application."

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On Jan 30, 2011, at 7:52 , VIJAY SHEKHAR wrote:

> Well Push flag is used to let receiving OSI stack know that the data
> can now be pushed to the application it need not wait for more
> segments.
> However the urgent flag is probably used when you want to convey
> this message to the application. The application should support this
> if I am not mistaken.
>
> -Vijay Shekhar
> CCIE#17589/CISSP#65114/RHCE
> http://au.linkedin.com/in/vshekhar
>
>
> Quoting HEMANTH RAJ <hemanthrj_at_gmail.com>:
>
>> What is the difference between urgent and Push bit in TCP Header
>>
>> --
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>> Cisco Systems Inc.
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Received on Sun Jan 30 2011 - 20:25:36 ART