Increase UDP sending size over 64k bytes and get error -113,sending buffer not enough

Question

Dear all,
I have a case that I must send a data over 64k bytes in a socket with UDP . I got a error-113 shows "A message sent on a datagram socket was larger than the internal message buffer or some other network limit, or the buffer used to receive a datagram was smaller than the datagram itself.".I searched for this issue and got the closest answer as below:
http://digital.ni.com/public.nsf/allkb/D5AC7E8AE545322D8625730100604F2D?OpenDocument
It said I have to change buffer size with Wsock.dll. I used the same mathod to increaes the send buffer to 131072 bytes by choice optionname to so_sndbuf (x1001) and give it value with 131072 and it worked fine without error. However I still got an error 113 while sending data with " UDP Write.vi ". It seems UDP write.vi reset the buffer size? Are there any other things cause the error?
I attached example code. In UDP Sender.vi you can see I change send buffer size to 131072 and send date included a 65536 bytes data.There is also a UDP receiver.vi and there is some missing VI which you can get from the LINK. But it's not necessary.
Attachments:
UDP Sender.vi ‏14 KB
UDP Receiver.vi ‏16 KB
UDP_set_send_buffer.vi ‏16 KB

Answer 1

The header for a UDP packet includes a 16 bit field that defines the size of the UDP message (HEADER AND DATA)
16 bits limits you to a total size of 65635 bytes, minus the header sizes; a minimum of 20 bytes are required to define an IP packet and 8 bytes for UDP leaving an effective data payload of 65507
 bytes.
LabVIEW is not the issue...
http://en.wikipedia.org/wiki/User_Datagram_Protocol#Packet_structure
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