The network protocol stack problem,
We found a problem. After our network has been running for a long time, large data packets will be received abnormally. 
The length of the data packet is 8KB. At the same time, when we ping the device, the specified data packet size is 10240
 bytes, which is also a ping failure, but we put the ping data packet If the size is set to be less than or equal to 
1500, it can be pinged normally. The version we use is QNX 6.5.0 BSP for TI BeagleBone.

Receiving more than 1KB bytes, calling the recvfrom function, no return, but receiving less than 1KB bytes, the return 
is normal.