Effect of ARP package on FTP dump under vxworks-6.6 system

1、 Application scenarios ： In normal communication , plug-in unit （192.168.10.10） With external devices （192.168.10.20） Conduct UDP signal communication , When copying files on plug-ins , You need to disconnect the plug-in from the network cable of the external device , Link the plug-in to PC On board (192.168.10.30), Use FTP Dump files in the device
2、 Abnormal phenomenon ： When using FTP Perform a large number of file dump operations （retr） when , There will be network abnormal problems from time to time , The error log is generally caused by the inability to allocate effective network resources , Then the network task of the system hangs .
3、 Troubleshoot problems ：1） The first doubt is ,FTP Every operation of the dump function has malloc and free operation , Is it caused by memory block misalignment , Changing to static memory allocation does not solve this problem ;
2） Compared with , There was a failure loading the application , Just run BSP The program will not fail , The suspicion is caused by the application using the network ;
4、 Solution ： stay PC Machine to plug-in FTP When copying files , Add plug-in end-to-end communication IP Address （ This example is 192.168.10.20）, Prevent plug-ins from constantly sending ARP package , Problem solved
5、 speculation ：VxWorks In the network protocol stack , The number of Ethernet packets in the network memory pool is fixed , When the plug-in sends out UDP Packet time , Because the corresponding IP Address , So send out ARP package , here UDP The package was not sent , It will also occupy a piece of network memory resources , When a large number of messages are sent , a large number of UDP The packet is full of network memory pool resources , Cause network communication failure .（ The above is personal speculation , Which Daniel knows the specific reason , Please give me more advice ）