Re: [CentOS] Network Diagnostics
On Tue, 7 Jan 2020 at 08:22, Chris Olson via CentOS wrote: > > 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 > The wireshark package by itself only comes with the text tools: tshark and similar. The wireshark-gnome comes with the wireshark video item [smooge@xanadu Packages]$ rpm -qlp wireshark-1.10.14-16.el7.x86_64.rpm | grep bin /usr/sbin/capinfos /usr/sbin/dftest /usr/sbin/dumpcap /usr/sbin/editcap /usr/sbin/mergecap /usr/sbin/randpkt /usr/sbin/rawshark /usr/sbin/reordercap /usr/sbin/text2pcap /usr/sbin/tshark /usr/share/wireshark/radius/dictionary.bintec [smooge@xanadu Packages]$ rpm -qlp wireshark-gnome-1.10.14-16.el7.x86_64.rpm | grep bin /usr/sbin/wireshark I will say from the problems in the start of this email that I am not sure wireshark is going to help show what is wrong. I am expecting that the printer's network card is broken in some way and is spewing hardware errors to the network. The linksys switch is a 'dumb' switch and will go into a hardware reset mode to try and clear it up. I would try the following: 1. Hardware reset the printer to factory settings and see if it comes back sane after reset up. If it does not then the problem is a hardware issue with the printer and either buy a new one or get it fixed. 2. If the hardware reset works, then I would run whatever Windows software configures and updates the printer BIOS and drivers to the newest from HP. Printers are now a vector for cyber-crime infection and the problems you are describing are also what one sees in a system which was sort of taken over. > Dependency Installed: > libsmi.x86_64 0:0.4.8-13.el7 > > Complete! > [user@computer ~]$ > [user@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@computer ~]$ > > > Recent successful installations: > > > [user@computer ~]$ > [user@computer ~]$ which mplayer > /usr/bin/mplayer > [user@computer ~]$ which ffmpeg > /usr/bin/ffmpeg > [user@computer ~]$ > > > ___ > CentOS mailing list > CentOS@centos.org > https://lists.centos.org/mailman/listinfo/centos -- Stephen J Smoogen. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Network Diagnostics
On Tue, 2020-01-07 at 13:21 +, Chris Olson via CentOS wrote: > > 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@computer ~]$ > [user@computer ~]$ which wireshark > /usr/bin/which: no wireshark in > (/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:/home/u > ser/.local/bin:/home/user/bin) > [user@computer ~]$ > the package wireshark does not contain the 'wireshark' binary, you should use 'tshark' on the commandline. The 'wireshark' binary is in the wireshark-gnome package and requires a graphical interface. tshark takes most of the same parameters as wireshark (if not all) Regards, Michel -- De informatie opgenomen in dit bericht kan vertrouwelijk zijn en is uitsluitend bestemd voor de geadresseerde. Indien u dit bericht onterecht ontvangt, wordt u verzocht de inhoud niet te gebruiken en de afzender direct te informeren door het bericht te retourneren. Het Universitair Medisch Centrum Utrecht is een publiekrechtelijke rechtspersoon in de zin van de W.H.W. (Wet Hoger Onderwijs en Wetenschappelijk Onderzoek) en staat geregistreerd bij de Kamer van Koophandel voor Midden-Nederland onder nr. 30244197. Denk s.v.p aan het milieu voor u deze e-mail afdrukt. -- This message may contain confidential information and is intended exclusively for the addressee. If you receive this message unintentionally, please do not use the contents but notify the sender immediately by return e-mail. University Medical Center Utrecht is a legal person by public law and is registered at the Chamber of Commerce for Midden-Nederland under no. 30244197. Please consider the environment before printing this e-mail. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
[CentOS] Network Diagnostics
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@computer ~]$ [user@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@computer ~]$ Recent successful installations: [user@computer ~]$ [user@computer ~]$ which mplayer /usr/bin/mplayer [user@computer ~]$ which ffmpeg /usr/bin/ffmpeg [user@computer ~]$ ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
