[En-Nut-Discussion] Latest fix in tcpsm.c and tcpout.c

[Alain M.]

I am very glad it is so :) but then "something" has been wrong in some 
of our discussions...

If timeous are limited, then is it normal to have timeouts in excess of 65s?

Alain

Henrik Maier escreveu:
> It probably would have been a good idea to look at the code first. Nut/OS'
> TCP stack implements all of these features. Timeout times are limited and
> even so the max. Number of retransmission attempts.
> 
> Henrik
> http://www.proconx.com
> 
>> -----Original Message-----
>> From: en-nut-discussion-bounces at egnite.de [mailto:en-nut-discussion-
>> bounces at egnite.de] On Behalf Of Bob Shaver
>> Sent: Tuesday, 15 April 2008 4:13 AM
>> To: 'en-nut-discussion at egnite.de'
>> Subject: Re: [En-Nut-Discussion] Latest fix in tcpsm.c and tcpout.c
>> Disclaimer: I have not looked at the Nut/OS code to see if it implements
>> any of
>> the following.  It appears from the previous discussions that it does not.
>> My
>> apologies if I am wrong.
>>
>> One thing that I think people are missing - the TCP specification calls
> for
>> a
>> maximum number of retries (and "suggests" selecting a maximum retransmit
>> timer
>> value).  If the re-transmit backoff time ever reaches this upper timeout
>> limit
>> (chosen by the system designer), the timeout value "saturates" and never
>> grows
>> any larger.  If the system hits the maximum number of retries, then the
>> connection **should** be closed under the assumption that the other end is
>> "gone".
>>
>> Continuing to retransmit over the course of several hours (much less
>> several
>> DAYS) without aborting the connection and attempting a new one is not what
>> TCP
>> was designed to do.  Instead, retry some limited number of times the close
>> the
>> connection.  Open a new connection and try again.  It this new connection
>> hits
>> the max # of retries (even during the SYN/SYNACK phase), abort it, then
>> open
>> yet another new connection.
>>
>> Bob.
>>
>>
>>
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