Test and development of the network chapter-problem location

In our testing work, we often encounter problems that a certain product website or service cannot be connected. With the help of the previous network-related knowledge, you can conduct preliminary troubleshooting from the following perspectives.

1. Ping the domain name of the website to confirm whether it is a DNS resolution problem;
2. When accessing intranet services through a domain name, first confirm whether the hosts file is configured with domain name mapping;
3. Ping the website IP address to check the network connectivity of the target server;
4. Telnet IP+port to confirm whether the remote service is reachable;
5. Conditionally go to the server to execute telnet to distinguish whether the service is not started or is blocked by fire protection;
6. ping 114.114.114.114 to detect whether you can access the Internet public network;
7. ifconfig check whether the computer IP, default gateway, DHCP, DNS are correct;
8. Ping the default gateway to detect the connectivity of the internal network access point;
9. Tracert checks the routing situation. When multiple networks are connected or a VPN is used, it can be judged whether the request has passed through the correct gateway/route.

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