请教一个 traceroute 的输出..

[mantianyu]

请问下, 什么情况下, traceroute 会有如下的输出呢?
我个人理解是第 7 行已经断了, 已经不能到达了, 可为啥第 8 行又可以到达了呢....

请教大神...

1 192.168.1.1 (192.168.1.1) 2.977 ms 3.552 ms 3.658 ms 4.283 ms 8.704 ms
2 112.226.152.1 (112.226.152.1) 65.111 ms 67.796 ms 70.308 ms 72.731 ms 77.151 ms
3 119.167.90.213 (119.167.90.213) 79.116 ms 81.965 ms 85.760 ms 86.204 ms 90.073 ms
4 119.167.86.61 (119.167.86.61) 187.686 ms 169.285 ms 161.300 ms 169.068 ms 169.266 ms
5 219.158.99.149 (219.158.99.149) 157.197 ms 160.143 ms 160.922 ms 163.319 ms 167.146 ms
6 219.158.96.118 (219.158.96.118) 167.942 ms 170.784 ms 174.785 ms 175.064 ms 177.545 ms
7 * * * * *
8 202.97.50.217 (202.97.50.217) 179.399 ms 183.033 ms 181.515 ms 180.178 ms 184.291 ms
9 202.97.39.14 (202.97.39.14) 200.550 ms 194.202 ms 195.965 ms 197.487 ms 205.912 ms
10 60.235.16.2 (60.235.16.2) 205.959 ms 206.074 ms 206.137 ms 218.850 ms 218.956 ms
11 222.173.66.38 (222.173.66.38) 299.918 ms 300.028 ms 302.057 ms 307.543 ms 308.248 ms
12 * * * * *
13 * * * * *
14 * * * * *
15 * * * * *
16 * * * * *
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25 * * * * *
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27 * * * * *
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30 * * * * *

[lehui99]

第7跳的路由器把icmp output给禁掉了呗，所以你收不到它的icmp回复。但它没禁掉icmp forward，所以可以把第8跳的icmp forward给第6跳，最终发回给你。

[mantianyu]

@lehui99 多谢, 我刚查了下看到网上说很多原因会导致这个情况, 乱七八糟的我也没看懂, 兄台说的是一种情况

[lightforce]

222.173.66.38
Announced By
Origin AS Announcement Description
AS4134 222.173.0.0/16 CHINANET SHANDONG PROVINCE NETWORK