$ ping mirrors.ustc.edu.cn
PING mirrors.USTC.edu.cn (202.141.160.110) 56(84) bytes of data.
$ tracepath 202.141.160.110
1?: [LOCALHOST] pmtu 1500
1: gateway 0.631ms
1: gateway 0.647ms
2: 172.24.127.1 0.342ms
3: 172.21.255.49 0.719ms
4: 172.21.255.1 1.255ms
5: no reply
6: no reply
7: 122.90.18.25 5.091ms
8: 122.90.9.245 1.945ms
9: 122.90.9.1 2.308ms
10: 61.237.127.185 16.771ms
11: 61.237.0.182 22.089ms
12: no reply
13: 202.97.37.41 22.675ms asymm 14
14: 202.97.44.173 20.568ms asymm 13
15: no reply
16: no reply
17: 61.190.194.54 28.921ms asymm 16
18: 10.12.2.54 38.596ms asymm 17
19: no reply
20: no reply
21: no reply
22: no reply
23: no reply
24: no reply
25: no reply
26: no reply
27: no reply
28: no reply
29: no reply
30: no reply
Too many hops: pmtu 1500
Resume: pmtu 1500
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