Re: [lwip-users] Changing listen port number on the fly

[Enrico Murador - Research & Development - CET]

Dear Kieran,
Thank you for your reply.

> Can I use SO_REUSEADDR on listening PCBs without compromising
> reliability, or it is "safer" to wait?
I think you'll be fine setting SO_REUSEADDR.


I've seen that SO_REUSEADDR flag is inerithed from listen pcb to 
connection pcb;
Do you think it should be better to clear the flag on connected pcbs 
(for example, in the accept callback)?

If I understand well, with SO_REUSEADDR flag set on the pcb passed to 
tcp_bind(),
the routine does allow binding if the address is already in use on:
- any listen/connection pcb having the REUSEADDR flag set,
- any listen/connection pcb in TIME-WAIT state (regardless of having the 
REUSEADDR flag set or not).
Am I right?

Thank you very much!
Enrico