Re: [lwip-users] Randomized initial local port in tcp_connect()

[Jan Menzel]

Hi Gus!
        You also need to define LWIP_RAND to a rand()-like function which will
be called to get the next random number. This number is used to initial
the local port. Only if both (LWIP_RAND and
LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS) are defined, UDP (udp.c line 98) and
TCP (tcp.c line 144) use random local ports.

        Jan

On 07.08.2017 3:19, gussabina wrote:
> Hello:
> 
> I noticed the tcp_connect() function always use the same local (ephemeral)
> port, rather than choosing a random port from a range of available ports.
> This causes problem connecting to the same server as they might think it's
> part of the previous connection if not closed properly.
> 
> I already set the #define LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS 1, but I notice
> same behavior.
> 
> Am I missing something?
> 
> Thanks
> Gus
> 
> 
> 
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