Hi all,
I'm writing a TCP/UDP server that should allow the user to change the
TCP/UDP listening port number,
but I'm not sure what is the best way to do this. I think I have to
close the listening pcb bound to the "old" port number, create a new
listen PCB
and bind the "new" port number to it... But what I have to do with the
already active TCP connections?
And if the user "plays around" with port numbers, I think I have to deal
with ERR_USE failures on bind() call
due to listening connections in TIME_WAIT state (for example, if the
port number is changed from 1024 to 1025 and then
re-changed to 1024 without leaving the TIME_WAIT period to elapse).
Can I use SO_REUSEADDR on listening PCBs without compromising
reliability, or it is "safer" to wait?
I was thinking if there is a way to change the port that is already
bound to a listening TCP pcb, or bound to an UDP pcb,
without closing the pcb and creating a new one, and if this could
"override" the previous problem.
Thank you very much
Enrico
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