News

Fan feedback: How to diagnose a company's overall Internet anomaly? Keep up with the pace, classic TCP flow analysis case!

For this kind of network-wide lag problem, the common reasons that can be thought of may include: DNS server abnormality or slow response,

31 2025-05

What is VLAN? How to use VLAN to improve network security and efficiency?

Simply put, VLAN is like using an "invisible wall" to separate devices in different departments in the same building. They can only communicate within their own VLAN

31 2025-05

Transport layer TCP three-way handshake and four-way wave: Do you really understand it?

If three handshakes are the "beginning of love", then four waves are the "whole process of breaking up" - rational and restrained, ensuring that the other party is ready

30 2025-05

Detailed explanation of Layer 2/Layer 3/Large Layer 2 networks: basic concepts, related technologies, and the relationship between the three

This issue shares with you basic network troubleshooting knowledge, including the basic concepts of Layer 2/Layer 3/Large Layer 2 networks, related technologies, and the relationship between the three.

30 2025-05

NAT technology revealed: Do you really understand static NAT, dynamic NAT and PAT?

Static NAT, dynamic NAT and PAT (Port Address Translation) are the three major mechanisms of NAT, showing unique advantages in different scenarios.

29 2025-05

OSPF configuration guide: from basic principles to practical exercises

Compared with RIP (Routing Information Protocol), OSPF has faster convergence speed, higher scalability and more accurate routing calculation capabilities.

29 2025-05

Actual combat case: AC cannot detect AP. Can’t it solve such a basic problem?

A coal group uses Cisco three-layer switches as the core and aggregation. The wireless network uses TP's AC+AP to connect to the core switch. As a result, the AC cannot detect the AP. What should I do?

28 2025-05

90% of people have fallen into this network failure trap. Have you fallen into this trap?

Why can't I access the Internet even though my device is connected to Wi-Fi? Why does it take so long to open a web page even though the Internet speed should be fast?

28 2025-05

How do police find your door through an IP address? I was in a cold sweat after reading this!

Today, we are going to discuss this amazing technology - it can accurately locate IP addresses, which makes many people who attempt to engage in illegal activities on the Internet feel terrified.

27 2025-05

In small and medium-sized scenarios such as homes and restaurants, how can we troubleshoot

During network use, the entire network may be disconnected and unable to access the Internet. Please refer to the following for possible reasons and detailed troubleshooting methods.