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【问题】
该IP是可以被ping通的，但是在ping过程中收到无效包，程序并没有再继续等待ping echo，而是继续发送ping req，导致后面回来的ping echo没有被标记为ok
root@localhost:/share/wenqikai# ./ping 5.5.12.101
64 bytes from 5.5.12.101: icmp_seq=1 ttl=64 time=0.5 ms
recv invalid icmp packet!
recv invalid icmp packet!
recv invalid icmp packet!
--- 5.5.12.101 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 1002 ms（--> 收到4个包， 没有丢失，实际上把无效包也统计在内了）
rtt min/avg/max = 0.460/0.460/0.460 ms
ping 4 count, 1 ok.（--> 这里显示只有1个有效包）
【解决方案】
收到无效包时，继续接收ping echo。如1s内未接收不到有效ping echo包，再发送下一个ping req