Shulou(Shulou.com)06/02 Report--

Today, I will talk to you about why ping does not access the ip address of the CVM. Many people may not know much about it. In order to make you understand better, the editor has summarized the following for you. I hope you can get something according to this article.

The failure to reach the ip address of the CVM ping may be caused by incorrect configuration of the target server, incorrect domain name resolution, link failure, and so on.

Under the premise of ensuring that the local network is normal (you can normally ping to other websites), you can conduct the following troubleshooting.

Confirm whether there is a public network IP

CVM instances must have a public network IP to access each other with other computers on the Internet. The instance does not have a public network IP, and the private network IP cannot be connected directly with the outside ping. If there is no public network IP, you can bind an elastic public network IP.

Security group setting confirmation

A security group is a virtual firewall that can control inbound and outbound traffic of associated CVM instances. Rules for security groups can specify protocols, ports, policies, and so on. Since ping uses the ICMP protocol, it is important to pay attention to whether the security group associated with the instance allows ICMP.

System setup check

Whether the Linux system allows ping or not is decided by both the kernel and firewall settings, either of which will result in the ping package "Request timeout". Use iptables-L to view the firewall rules of the current server, and check the corresponding ICMP rules to see if they are prohibited.

Domain name filing and resolution

If it is possible to ping the public network IP, but the domain name ping is not available, the domain name may not be licensed or the domain name resolution may be a problem. If you want to build a website, it is recommended to apply for the website record first, and then check the details of domain name resolution to see if it has been correctly configured.

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