Reply from 192.168.2.1: Destination host unreachable.
Reply from 192.168.2.1: Destination host unreachable.意思是从192.168.2.1返回的icmp信息为，目标主机为不可达Reply from 192.168.2.1: bytes=32 time=31ms TTL=255意思是从192.168.2.1返回的icmp信息为，icmp数据包为32字节，延时21ms，time to live值为255
