遭遇Reply from : TTL expired in transit.
2020-02-09 23:51:13
供稿：網(wǎng)友
TTL expired in transit 告急
今天一大早就碰到怪事哦。對(duì)方無(wú)法遠(yuǎn)程連接本地主機(jī)，雙方均為ADSL接入INTERNET,網(wǎng)絡(luò)狀態(tài)一切正常。使用PING命令測(cè)試，測(cè)試結(jié)果如下：
C:/ ping 58.33.46.92
Pinging [58.33.46.92] with 32 bytes of data:
Reply from 61.152.81.25: TTL expired in transit.
Ping statistics for 58.33.46.92:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
返加代表TTL expired in transit 代表TTL（生命周期）在傳輸過(guò)程中過(guò)期，什么意思呢？我來(lái)解釋一下！
導(dǎo)致這個(gè)問(wèn)題出現(xiàn)的原因有兩個(gè)：
1）TTL值太小！TTL值小于你和對(duì)方主機(jī)之間經(jīng)過(guò)的路由器數(shù)目。
2）路由器數(shù)量太多，經(jīng)過(guò)路由器的數(shù)量大于TTL值！
接下來(lái)要找出問(wèn)題所在就要用 TRACERT命令查看所經(jīng)過(guò)的路由，測(cè)試結(jié)果如下：
C:/ >tracert -d 58.33.46.92
Tracing route to [58.33.46.92]
over a maximum of 30 hops:
1 6 ms 5 ms 5 ms 192.168.0.1
2 10 ms 6 ms 5 ms 192.168.0.251
3 245 ms 131 ms 146 ms 61.129.99.217
4 18 ms 19 ms 20 ms 202.101.63.13
5 20 ms 16 ms 18 ms 61.152.81.14
6 22 ms 17 ms 19 ms 61.152.81.5
7 16 ms 14 ms 20 ms 61.152.81.6
8 21 ms 15 ms 19 ms 61.152.81.25
9 20 ms 16 ms 18 ms 61.152.81.26
10 20 ms 19 ms 15 ms 61.152.81.5
11 15 ms 14 ms 19 ms 61.152.81.6
12 20 ms 19 ms 15 ms 61.152.81.25
13 17 ms 19 ms 19 ms 61.152.81.26
14 17 ms 19 ms 15 ms 61.152.81.5
15 18 ms 18 ms 20 ms 61.152.81.6
16 17 ms 18 ms 15 ms 61.152.81.25
17 17 ms 19 ms 19 ms 61.152.81.26
18 16 ms 19 ms 14 ms 61.152.81.5
19 16 ms 19 ms 14 ms 61.152.81.6
20 17 ms 19 ms 14 ms 61.152.81.25
21 16 ms 20 ms 19 ms 61.152.81.26
22 16 ms 19 ms 20 ms 61.152.81.5
23 16 ms 20 ms 19 ms 61.152.81.6
24 17 ms 19 ms 19 ms 61.152.81.25
25 17 ms 18 ms 20 ms 61.152.81.26
26 17 ms 20 ms 19 ms 61.152.81.5
27 18 ms 17 ms 24 ms 61.152.81.6
28 18 ms 20 ms 19 ms 61.152.81.25
29 19 ms 19 ms 20 ms 61.152.81.26
30 19 ms 20 ms 18 ms 61.152.81.5
Trace complete.
通過(guò)監(jiān)測(cè)，可以清楚的發(fā)現(xiàn)，路由產(chǎn)生環(huán)路，在61.152.81.5，61.152.81.6，61.152.81.25，61.152.81.26，這四個(gè)路由之間轉(zhuǎn)不出來(lái)了。所以造成TTL expired in transit。由于從192.168.0.1（網(wǎng)關(guān)）出去，到192.168.0.251（本地路由），再到61.129.99.217（專(zhuān)線關(guān)網(wǎng)），最后出去202.101.63.13-》61.152.81.14（電信路由）一切都比較正常，說(shuō)明問(wèn)題不是出在本地，所以應(yīng)該是電信的問(wèn)題。
打電話給電信報(bào)修了一下，業(yè)務(wù)人員還不知道是怎么回事說(shuō)了一大堆，他也不是很明白，只好說(shuō)是叫一個(gè)技術(shù)再打電話過(guò)來(lái)，過(guò)了一會(huì)兒電信的技術(shù)人員打電話來(lái)問(wèn)情況，專(zhuān)業(yè)人員到底不一樣，一說(shuō)就知道是什么問(wèn)題了，我把IP報(bào)給他，再把在哪幾個(gè)路由產(chǎn)生環(huán)路也報(bào)了一下，他就去檢查了，一會(huì)兒?jiǎn)栴}就得到解決，再用PING測(cè)試一下看看：
C:/ >ping yurenliang.vicp.net
Pinging yurenliang.vicp.net [58.33.46.92] with 32 bytes of data:
Reply from 58.33.46.92: bytes=32 time=37ms TTL=246
Reply from 58.33.46.92: bytes=32 time=40ms TTL=246
Ping statistics for 58.33.46.92:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 35ms, Maximum = 40ms, Average = 37ms
問(wèn)題是得到了解決，但問(wèn)題出在什么地方呢？事后電信的技術(shù)人員又打電話過(guò)來(lái)解釋了一下。問(wèn)題原來(lái)是這個(gè)樣子的。由于58開(kāi)頭的這批新IP地址沒(méi)有得到優(yōu)化，所以可能經(jīng)過(guò)的路由數(shù)會(huì)非常多，有時(shí)還可能會(huì)去國(guó)外兜一圈再回來(lái)。（暈哦。這是引用電信技術(shù)的原話）
現(xiàn)在解決這個(gè)問(wèn)題的辦法有兩個(gè)：
1. 當(dāng)發(fā)現(xiàn)IP為58開(kāi)頭時(shí)，重新?lián)芴?hào)，最好能撥到61開(kāi)頭的，這樣一定不會(huì)有問(wèn)題。
2. 像電信申請(qǐng)，更換一個(gè)端口。
