Re: [lwip-users] UDP bind error due to address and port reuse

[Michael Steinberg]

Am 03.12.2016 um 17:37 schrieb Surya Chaitanya:
> Hi,
>
> The scenario is something like this. I have created an array of say, 5 UDP 
> PCB's.
> I'd like to bind all these 5 UDP PCB's to the same local IP address and port 
> number
> combination. Isn't this posible? Like you said, if we cannot bind an IP:Port 
> more
> than one time, what is the purpose of SO_REUSE and SOF_REUSEADDR flags? Aren't 
> they
> for reusing a particular port:IP combination for several PCBs at the same time?
> Thank you.
>
> Regards,
> Surya

Hello Surya,

Have a look at this nice explanation

http://stackoverflow.com/questions/14388706/socket-options-so-reuseaddr-and-so-reuseport-how-do-they-differ-do-they-mean-t

which shows in detail why those options are not meant to do what you 
seem to be thinking (are you expecting some kind of load balancing?) on 
standard bsd socket behaviour. I cannot tell if the intended behaviour 
is different on lwip though.

Michael