First review the ping
1. The meaning of PING:
PING is the abbreviation of Packet Internet Groper, which is "packet Internet detector".
2. Function:
Send ICMP (Internet Control Message Protocol) echo request to the target device via and wait for the reply , to test whether the target device is reachable and the round-trip delay time.
3. How to use:
Enter the ping command in a command prompt or terminal window, followed by the IP address or domain name of the target device. For example: ping 192.168.0.1 or ping www.example.com.
4. Working principle:
The ping command first builds an ICMP echo request packet and sends it to the target device. When the target device receives the request, it will send an ICMP echo reply packet as a response.
5. Test results:
- If the target device is working properly and the network connection is normal, you will receive a reply from the target device showing the round-trip time (RTT) and the status of each data packet sent and received.
- If the target device is unreachable or there is a problem with the connection, you will receive a timeout or error message indicating that communication with the target device cannot be achieved.
6. Purpose:
- Check whether the network connection is normal to determine whether the target device can be reached and respond.
- Test and monitor network latency to understand packet round-trip times.
- Assist in troubleshooting network problems such as packet loss, high latency, or connectivity issues.
Possible reasons for ping failure and basic solutions
1. Network connection problem:
- Check whether the network connection between the two computers is normal. Make sure either the network cable or Wi-Fi connection is properly connected to the network interface and there are no physical faults.
- Make sure that both computers have obtained valid IP addresses and can be used for network communication.
2. IP address problem:
- Confirm whether the IP addresses of the two computers are within the same subnet range. For example, if one computer's IP address is 192.168.0.100 and another computer's IP address is 192.168.1.100, they may be on different subnets and unable to communicate directly.
- Check whether the IP addresses of the two computers conflict. Make sure the IP addresses of the two computers are unique and non-duplicate.
3. Firewall or security policy issues:
- Check the firewall settings on both computers. Firewalls may block ping requests. You can try turning off the firewall or allowing ping requests through the firewall.
- Make sure there are no other security policies on the corporate network or router that are blocking ping requests. Contact your company's network administrator to learn about network security policies and make appropriate configuration changes as needed.
4. DNS resolution problem:
- Try pinging another computer using the IP address instead of the hostname (domain name). This will bypass DNS resolution and ensure that the IP address is used for pinging directly.
5. Router or network device configuration issues:
- Verify that routers or other network devices on the corporate network are configured correctly. Check the network device's routing table, ACL, NAT, etc. settings to make sure they are not blocking ping request traffic.
- If you have multiple network switches, make sure the links between them are connected properly and there are no issues with the ports.