奇怪的PING返回值

xf645 · 发表于 2008-8-22 13:59:32

昨天想分析一下路径MTU,其中找了一个非洲的IP,ping是出现以下情况
C:\Documents and Settings\Administrator>ping 168.172.128.94

Pinging 168.172.128.94 with 32 bytes of data:

Reply from 155.232.144.107: TTL expired in transit.
Reply from 155.232.144.107: TTL expired in transit.
Reply from 155.232.144.107: TTL expired in transit.
Reply from 155.232.144.107: TTL expired in transit.

Ping statistics for 168.172.128.94:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
回去TTL值太小,觉得非常奇怪,后又加上参数-i,继续PING,
C:\Documents and Settings\Administrator>ping 168.172.128.94 -i 100

Pinging 168.172.128.94 with 32 bytes of data:

Reply from 155.232.144.107: TTL expired in transit.
Reply from 155.232.144.107: TTL expired in transit.
Reply from 155.232.144.107: TTL expired in transit.
Reply from 155.232.144.107: TTL expired in transit.

Ping statistics for 168.172.128.94:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
请问一下各位大虾,是什么原因啊??这是我抓的包

xf645 · 发表于 2008-8-22 14:02:56

根据报文中分析,好像经过某一路由的时候,将发的报文中的TTL值改成1了

zhousf · 发表于 2008-8-22 16:14:04

对方回路造成TTL值耗尽。

xf645 · 发表于 2008-8-22 17:01:29

哈哈,真是言简意赅啊

Nelson · 发表于 2008-8-22 17:03:08

就是很简单的由于太远了而TTL死掉。

通过ping -i 255。得出来的结果就不再是TTL expire而是超时了
通过tracert命令。可以看到中间经历了多少次路由转发也就是多少跳。这中间并没有看到环路现象。

单纯的由于TTL耗尽。

xf645 · 发表于 2008-8-22 17:11:07

C:\Documents and Settings\Administrator>tracert 168.172.128.94

Tracing route to 168.172.128.94 over a maximum of 30 hops

  1    8 ms 10 ms    7 ms  211.147.26.185
  2    8 ms    8 ms    8 ms  10.255.52.121
  3    8 ms    7 ms    7 ms  210.75.97.193
  4 10 ms    8 ms    8 ms  210.75.96.57
  5    *       8 ms    8 ms  202.99.1.149
  6 11 ms 11 ms 10 ms  221.239.18.133
  7    *    11 ms 10 ms  221.239.7.53
  8 12 ms 11 ms 11 ms  221.238.222.185
  9 18 ms 15 ms 14 ms  202.97.34.5
10 14 ms 14 ms 16 ms  202.97.53.42
11 14 ms 14 ms 15 ms  202.97.53.126
12 229 ms 228 ms 229 ms  202.97.52.98
13    *    228 ms 229 ms  ldn-b2-link.telia.net [213.248.98.201]
14 229 ms 229 ms 229 ms  ldn-tch-i2-link.telia.net [80.91.250.214]
15 229 ms 229 ms 229 ms  ldn-tch-i1-link.telia.net [80.91.250.217]
16 229 ms 229 ms 229 ms  tenet-ic-124981-ldn-tch-i1.c.telia.net [213.248.
79.194]
17 379 ms 390 ms 383 ms  unknown.uni.net.za [196.32.209.26]
18 379 ms 379 ms 381 ms  mastiff-camembert.uni.net.za [155.232.145.229]
19 532 ms 545 ms 547 ms  c00056.uni.net.za [155.232.144.110]
20    *    610 ms 601 ms  unknown.uni.net.za [155.232.144.107]
21 738 ms 694 ms 645 ms  c00056.uni.net.za [155.232.144.110]
22 635 ms 443 ms 432 ms  unknown.uni.net.za [155.232.144.107]
23 455 ms 501 ms 888 ms  c00056.uni.net.za [155.232.144.110]
24 767 ms 941 ms 750 ms  unknown.uni.net.za [155.232.144.107]
25 462 ms 892 ms 584 ms  c00056.uni.net.za [155.232.144.110]
26 823 ms 705 ms 567 ms  unknown.uni.net.za [155.232.144.107]
27 727 ms    *    1158 ms  c00056.uni.net.za [155.232.144.110]
28 562 ms    *    772 ms  unknown.uni.net.za [155.232.144.107]
29 789 ms 969 ms    *    c00056.uni.net.za [155.232.144.110]
30 923 ms 892 ms 481 ms  unknown.uni.net.za [155.232.144.107]

Trace complete.

我想这应该算是环路吧,另外我设成255超样出现同样的报错,觉得不可能是TTL耗尽了,网络不应该有这么大,

Nelson · 发表于 2008-8-22 17:17:53

楼上的兄弟很有耐心。等到了10以后
看来的确是在155.232.144.110和107之间loop了。

wwwang · 发表于 2008-8-23 11:07:35

6楼的说的对，应该是环路了。以前也遇到过协议转换器的线插反了或是光纤断了也会这样。

奇怪的PING返回值

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6楼的说的对