Here’s how to find if clients are connected to Apache or Nginx service.
netstat -tn src: 80 netstat -tn src: 443 |
Internet Test
My internet has been flaky lately. I wrote a script that logs my internet connection.
I’m running it in cron every minute.
#!/bin/bash log='/home/ulysses/Code/spectrum.log' if nc -zw1 google.com 443; then echo 'Spectrum is up' $(date) >> $log else echo 'Spectrum is down' $(date) >> $log fi |
To view, just cat the log.
cat spectrum.log Spectrum is up Fri Jun 26 15:14:01 EDT 2020 Spectrum is up Fri Jun 26 15:15:01 EDT 2020 Spectrum is up Fri Jun 26 15:16:01 EDT 2020 Spectrum is up Fri Jun 26 15:17:01 EDT 2020 Spectrum is up Fri Jun 26 15:18:01 EDT 2020 |
So, I now have a record when it was up or down.
Testing a Network Port Connection
You can test a network port connection using the “nc” command on Linux and “telnet” on Windows.
Format:
$ nc -zv domain.com port
C:\> telnet domain.com port
$ nc -zv domain.com 80 Connection to domain.com 80 port [tcp/http] succeeded! |
C:\> telnet -zv domain.com 80 Connecting To domain.com...Could not open connection to the host, on port 80: Connect failed |
For Telnet, if a connection is successful, it returns no message.