如何处理能 ping 通但端口不通时端口可用性探测(2)-木庄网络博客

示例1

C:\&gt;tracetcp www.aliyun.com:135
Tracing route to 115.239.210.27 on port 135
Over a maximum of 30 hops.
1       3 ms    3 ms    3 ms    30.9.176.1
2       4 ms    3 ms    3 ms    10.64.200.33
3       3 ms    3 ms    3 ms    10.64.1.1
4       *       *       *       Request timed out.
5       *       *       *       Request timed out.
6       *       *       *       Request timed out.
7       *       *       *       Request timed out.
8       *       *       *       Request timed out.
9       *       *       *       Request timed out.
10      *       *       *       Request timed out.
11      *       *       *       Request timed out.
12      *       *       *       Request timed out.
13      *       *       *       Request timed out.
14      *       *       *       Request timed out.
15      *       *       *       Request timed out.
16      *       *       *       Request timed out.
17      *       *       *       Request timed out.
18      *       *       *       Request timed out.
19      *       *       *       Request timed out.
20      *       *       *       Request timed out.
21      *       *       *       Request timed out.
22      *       *       *       Request timed out.
23      *       *       *       Request timed out.
24      *       *       *       Request timed out.
25      *       *       *       Request timed out.
26      *       *       *       Request timed out.
27      *       *       *       Request timed out.
28      *       *       *       Request timed out.
29      *       *       *       Request timed out.
30      *       *       *       Request timed out.
Trace Complete.

上述探测数据中，目标端口在第 3 跳之后就没有数据返回。说明相应端口在该节点被阻断。

示例结论：因为该节点为内网 IP，可能是本地网络相关安全策略所致，您需要联系本地网络管理人员做进一步排查分析。

示例2

[root@mycentos ~]# traceroute -T -p 135 www.baidu.com
traceroute to www.baidu.com (111.13.100.92), 30 hops max, 60 byte packets
 1  * * *
 2  192.168.17.20 (192.168.17.20)  4.115 ms  4.397 ms  4.679 ms
 3  111.1.20.41 (111.1.20.41)  901.921 ms  902.762 ms  902.338 ms
 4  111.1.34.197 (111.1.34.197)  2.187 ms  1.392 ms  2.266 ms
 5  * * *
 6  221.183.19.169 (221.183.19.169)  1.688 ms  1.465 ms  1.475 ms
 7  221.183.11.105 (221.183.11.105)  27.729 ms  27.708 ms  27.636 ms
 8  * * *
 9  * * *
10  111.13.98.249 (111.13.98.249)  28.922 ms 111.13.98.253 (111.13.98.253)  29.030 ms  28.916 ms
11  111.13.108.22 (111.13.108.22)  29.169 ms  28.893 ms 111.13.108.33 (111.13.108.33)  30.986 ms
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *