[CentOS] Network Diagnostics

Tue Jan 7 13:21:36 UTC 2020
Chris Olson <chris_e_olson at yahoo.com>

In our smallest office, we have a Dell CentOS 7 system, a
Windows system and an HP 8610 printer, all hard-wire Ethernet
connected with a Linksys router. The router provides Internet
connection. All of the network-connected systems get their
IP address from the router at power up.

Successful network connection of the printer at power up
has recently started taking much longer than usual.  The
display on the front of the printer indicates that it is
initially attempting wireless connection even though this
feature is turned off.  Ethernet connection is eventually
achieved and the printer functions normally on the network
but just for a few minutes.

After about five minutes, the printer drops its Ethernet
connection and appears to be attempting wireless connection
once again.  During this period, network connectivity is
disrupted for the other systems on the network. They are
not able to communicate with each other or access the
Internet through the router.  Turning off the printer
restores network connection for the other systems.

One of our personnel at another office suggested using
Wireshark to check out the network when the printer is
having difficulty.  Wireshark was apparently not on this
system so we installed it using yum install.  The tail
end of the apparently successful installation process
is shown below.  Unfortunately, we cannot seem to find
Wireshark on the system.

Is it possible that Wireshark was not actually installed
or do we just not know how to locate and use it?

Is this printer networking issue a known problem and is
Wireshark the right tool to diagnose the problem?


  wireshark.x86_64 0:1.10.14-16.el7                                                             

Dependency Installed:
  libsmi.x86_64 0:0.4.8-13.el7                                                                  

[user at computer ~]$
[user at computer ~]$ which wireshark
/usr/bin/which: no wireshark in (/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/home/user/.local/bin:/home/user/bin)
[user at computer ~]$ 

Recent successful installations:

[user at computer ~]$ 
[user at computer ~]$ which mplayer
[user at computer ~]$ which ffmpeg
[user at computer ~]$