Re: [lwip-users] Maximum retransmission value

[address@hidden]

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).

Simon


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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