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? Thanks. Installed: wireshark.x86_64 0:1.10.14-16.el7 Dependency Installed: libsmi.x86_64 0:0.4.8-13.el7 Complete! [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 /usr/bin/mplayer [user at computer ~]$ which ffmpeg /usr/bin/ffmpeg [user at computer ~]$