Ping 出现： TTL expired in transit.
Ping 出现： TTL expired in transit.
１、我先PING了一下IP地址，结果发现：
C:\Documents and Settings\xm_dengwh>ping 218.xxx.xxx.xxx (这里是我们的IP地址)
Pinging 218.xx.xx.xx with 32 bytes of data:
Reply from 218.85.151.173: TTL expired in transit.
Reply from 218.85.151.173: TTL expired in transit.
Reply from 218.85.151.173: TTL expired in transit.
Reply from 218.85.151.173: TTL expired in transit.
需要注意的是: 我的IP地址:218.xxx.xxx.xxx和218.85.151.173不同.
不是正常的TTL返回时间，从提示来看应该是TTL耗尽了，为什么ＴＴＬ会耗尽呢？难道是路由器配置错误，形成环路了使数据包不停的在两个路由器之间传送，使ＴＴＬ耗尽？为了证实我的猜想,我觉定使用tracert看一下所经过的路由器情况.
C:\Documents and Settings\xm_dengwh>tracert 218.85.xx.xx
Tracing route to mx2.bestcheer.com [218.85.xxx.xxx]
over a maximum of 30 hops:
1 10 ms 1 ms 1 ms 59.xx.xx.xx
2 1 ms 2 ms 1 ms 61.154.238.102
3 * * * Request timed out.
4 1 ms 3 ms 1 ms 218.85.151.173
5 * * * Request timed out.
6 2 ms 2 ms 1 ms 218.85.151.173
7 * * * Request timed out.
8 2 ms 2 ms 2 ms 218.85.151.173
9 * * * Request timed out.
10 * 2 ms 2 ms 218.85.151.173
11 * * * Request timed out.
12 3 ms 3 ms 3 ms 218.85.151.173
从结果来看,应该是第3hop转数据包到第4hop(218.85.151.173)上,然后又转第3hop上,因此数据在第3路由器与第4个路由器之间造成循环使数据不停的两个路由器之间转发.
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