What is the common error message for ping commands?

Good evening, my friends!

Today we are going to talk about ping command common error messages , and what network problems these error messages usually mean .

When checking network failures on a daily basis, pingIt is one of our most used and fastest testing tools.

Although the command is simple, the returned information hides a wealth of valuable clues。Master these common error prompts to help us quickly locate the problem .

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Let's take a look at some common ping return errors and what they represent!

01 Request timed out

This is the most common error message and means that the target device did not respond to the ICMP Echo request. Common causes include:

· The target device is shut down or not accessible

· Firewall or ACL prevents ICMP communication

· There is a packet loss or link outage problem in the network

02 Destination Host Unreachable

Often it is a message returned by a local device or intermediate router that a path to the target host cannot be found at all. The possible reasons are:

· Local routing table configuration error

· Default gateway settings error

· Physical link failure （e.g. loose network cable）

03 General Failure

This is a general error, indicating that there was a local problem sending the ICMP request, such as:

· The network interface is not enabled

· Local TCP / IP stack exception

· The firewall software intercepted the ping.

04 TTL Expired in Transit

When a packet is forwarded more times in the network than itsTTL （Survival time） value, this error occurs。Common causes include:

· A network loop has appeared.

· Router configuration error caused dead cycle forwarding

05 Unknown Host

If you ping a domain name instead of an IP address and return this error, the domain name cannot be resolved locally. Frequently asked questions include:

· DNS server unreachable or misconfigured

· Domain name spelling error

Troubleshooting ideas for ping error messages : When you encounter a ping error , don 't panic . You can troubleshoot according to the following ideas :

Flowchart : Basic steps to troubleshoot ping issues flow chart

· Confirm the IP configuration of this machine first （ IP address , subnet mask , default gateway ） .

· Check whether the physical connection is normal （ e.g. network cable , Wi-Fi connection ）

· Test whether the ping native 127.0.0.1 is normal

· Test ping local gateway to confirm local network connectivity

· Test ping external network IP to confirm whether you can access the public network

· Test ping domains to confirm that DNS is working properly

Frequently Asked Questions What is the ICMP protocol ？

ICMP （ Internet Control Message Protocol ） is a protocol for transferring control messages between network devices . For example , the ping command is based on ICMP .

What if the ping doesn't work, but you can access the web page?

Some firewalls specifically prohibit ICMP ping for security purposes, but allow HTTP / HTTPS access, which is normal

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Ping 's TTL value why is different ？

The default TTL value is different for different systems, such as 128 for Windows and 64 for Linux. You can also predict how many devices pass through the path by looking at the TTL changes.

We shared this today. Goodbye next time!

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