PING (does not equal internet connectivity)

ping 1.1.1.1 (cloudflare’s dns) –> Should return something like

Reply from 1.1.1.1: bytes=32 time=34ms TTL=55

ping 8.8.8.8 (google’s dns)



Telnet (over port 80 = equals internet connectivity) or CURL over http




telnet yahoo.ca 80  -->> Should return 'Connected'
curl http://www.google.com --> Should return the html content


telnet checkip.dyndns.org 80 –> Should return ‘connected’


Additionally, type 


GET / HTTP/1.1HOST: checkip.dyndns.org --> Should return the html content shown below


HTTP/1.1 200 OK
Content-Type: text/html
Server: DynDNS-CheckIP/1.0
Connection: close
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 106

<html><head><title>Current IP Check</title></head><body>Current IP Address: X.X.X.X</body></html>


Port 443 Test


wget –no-check-certificate https://


curl -c https://  (-c to ignore expired ssl certificate warnings)


Install Ping (uses ICMP) and Traceroute (uses UDP or ICMP) on Ubuntu


sudo apt install iputils-ping

which ping


/usr/bin/ping
$ ping -c 1 linuxconfig.org


sudo apt-get install traceroute


$ traceroute linuxconfig.org


$ traceroute -I ICMP example.com








Anuj holds professional certifications in Google Cloud, AWS as well as certifications in Docker and App Performance Tools such as New Relic. He specializes in Cloud Security, Data Encryption and Container Technologies.


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Anuj Varma – who has written  posts on Anuj Varma, Hands-On Technology Architect, Clean Air Activist.




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