在linux服务器上ping某个主机时，出现(DUP!)，一般是什么原因？
[dev@www_php_11_25_39 ~]$ ping smtp.qq.com
PING mail.qq.com (12.13.14.15) 56(84) bytes of data.
64 bytes from localhost (12.13.14.15): icmp_seq=1 ttl=127 time=0.241 ms
64 bytes from localhost (12.13.14.15): icmp_seq=1 ttl=127 time=0.264 ms (DUP!)
64 bytes from localhost (12.13.14.15): icmp_seq=2 ttl=127 time=0.225 ms
64 bytes from localhost (12.13.14.15): icmp_seq=2 ttl=127 time=0.269 ms (DUP!)
64 bytes from localhost (12.13.14.15): icmp_seq=3 ttl=127 time=0.245 ms
64 bytes from localhost (12.13.14.15): icmp_seq=3 ttl=127 time=0.250 ms (DUP!)
64 bytes from localhost (12.13.14.15): icmp_seq=4 ttl=127 time=0.236 ms
64 bytes from localhost (12.13.14.15): icmp_seq=4 ttl=127 time=0.271 ms (DUP!)
64 bytes from localhost (12.13.14.15): icmp_seq=5 ttl=127 time=0.447 ms
64 bytes from localhost (12.13.14.15): icmp_seq=5 ttl=127 time=0.454 ms (DUP!)
64 bytes from localhost (12.13.14.15): icmp_seq=6 ttl=127 time=0.245 ms
64 bytes from localhost (12.13.14.15): icmp_seq=6 ttl=127 time=0.274 ms (DUP!)
^C
--- mail.qq.com ping statistics ---
6 packets transmitted, 6 received, +6 duplicates, 0% packet loss, time 5241ms
rtt min/avg/max/mdev = 0.225/0.285/0.454/0.075 ms
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zkbhj - 凯冰科技站长
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在ping对方ip时，可能有一条以上的路径到达对方，因此会造成这种现象。解决方法是修改笔记本的ip地址，使之和他们不再一个网段，问题迎刃而解。