[lwip-devel] [bug #19162] lwip_sendto: possible to corrupt remote addr/port connection state

[Bryan Schwichtenberg]

Follow-up Comment #11, bug #19162 (project lwip):

Hello,
 I was also thinking that adding a new api message could be a good solution.
In reference as to why an ICMP destination unreachable is sent I think I have
the answer.  When the TFTP client requests a file from the server it connects
on a well known port (69). The file transfer actually happens on a ephemeral
port (usually in 32000 to 33000 ish range). When the failure occurs the pcb
hasn't closed it connection to port 69 yet when the first data packet from
the file transfer is sent on the ephemeral port. This results in lwIP
notifying the server that the destination is unreachable (I assume because it
thinks its connection is currently in use).

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