Cross-Carrier Access

Problem description

The customer used Probe, the provincial capital of the country, to access the URL monitored by the customer. It was found that cross-provincial access data was accessed from Shenyang Mobile to Nanning Mobile. Why does this phenomenon occur?

Problem analysis

Troubleshooting ideas
Instant Testing recurrence

Use the problematic Probe ID to do the tasks corresponding to the customer, and the problem is found in the recurrence.

Use the problematic Probe ID to access other data and find that it crosses provinces.

Use the problematic Probe ID to do forward tests multiple times and find that the real DNS used is Nanning Mobile’s DNS.
Data troubleshooting

During the background viewing time period, the Probe in question is a member of Tingyun Probe

Guess and doubt

They are the same member and have a large number of clicks. After checking in the background, Probe from all over the country uses the same gateway for export. It is suspected that a VPN is used.

Solution

Currently, there is no solution to monitor it in advance, and we can only disable this type Probe when discovered.

Skill expansion

(1) Meaning
You can check the real DNS used by Probe at that time. Do it a few times and get the most common DNS.
(2) Method
forward test

Use the monitoring Probe that needs to be detected to perform Instant Testing. The monitoring target is
aaaaa.DNS.networkbench.cn

Open the browser and access the URL ()
HTTP://dev.networkbench.com:8080/DNS.jsp?a=aaaaa

View the content of the page, and the display is the actual DNS query.

Note: 1. The value of a is a random string, just ensure that it does not repeat within a short period of time.
2. The key value of a in the monitoring target must correspond to

Problem description#

Problem analysis#

Guess and doubt#

Solution#

Skill expansion#

Problem description

Problem analysis

Guess and doubt

Solution

Skill expansion