Do not ping

Help me! I am developing DS80C400 in C,now I have happened a strange question,I
use the ping function in C lib to test the network,I config the network parameters
of the target board:
IP : 192 168 0 9
Subnet: 255 255 255 0
Prefix: 16
Gate  : 192 168 0 1
when I ping the address 192.168.0.9 and 127.0.0.1,the return value of the ping
function is 13,but when I ping the other address,the return value of the ping
function are all 0.and when I ping any address, the parameter of the ping:
responseare all 0(it is the initialization value by me).please tell me why this
happened and how to settle it?
thanks.

unsigned int  ping(struct sockaddr* address, unsigned int address_length, unsigned
int time_to_live, unsigned char* response);





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