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RE: [lwip-users] Maximum retransmission value

From: PELISSIER Christophe
Subject: RE: [lwip-users] Maximum retransmission value
Date: Mon, 27 Jul 2009 15:30:50 +0200

Ok Simon,

I was only thinking of a solution that did not require me to redesign the 
application that I inherited.


-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of address@hidden
Sent: Friday, July 24, 2009 5:08 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Maximum retransmission value

Changing these defines is generally not a good idea, unless you have detailed 
knowledge of what they do in the tcp stack. You might risk unstable connections 
on networks which are not 100% safe against packet loss, and you also might 
risk interoperability with other network stacks/devices.

In general, it is better to design your communication protocol in a way to 
detect a timeout instead of changing the timeout at TCP level, where you change 
it for all connections - although you might only need the timeout for a 
dedicated control connection (or something like that).


PELISSIER Christophe wrote:
> Hi,
> I want to speed up the connection error detection of my application.
> Is decreasing the TCP_MAXRTX and TCP_SYNMAXRTX value a good way to be 
> aware rapidely that a connection has been lost.
> Is there any risk to decrease TCP_MAXRTX from 12 (default value in my
> lwipopts.h) to 6 and TCP_SYNMAXRTX from 6 to 3?
> What can be the side effect that i must take care of?
> Thanks for your support.
> Regards,
> Christophe
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