It shouldn't
Check your code against the docs or the wiki
http://lwip.wikia.com/wiki/Raw/UDP
My code is something like:
mypcb = udp_new() != NULL
DEST_IP(&ipaddr);
// for SPECIFIC other end IP address
udp_connect(mypcb, &ipaddr, DEST_PORT) == ERR_OK
// otherwise, to connect to anyone
udp_bind(mypcb, IP_ADDR_ANY, LOCAL_PORT) == ERR_OK
udp_recv(mypcb, myrecv, NULL);
Perhaps you are not using IP_ADDR_ANY ?
To send:
// for SPECIFIC other end IP address, set in udp_connect()
udp_send(pcb, p);
// otherwise, you have to know the other end somehow (e.g.: from the
callback parameters)
udp_sendto(pcb, p, &addr, port);
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