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    Bad Pings from Windows, Good from Linux

    Scheduled Pinned Locked Moved IT Discussion
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    • scottalanmillerS
      scottalanmiller @Dashrender
      last edited by

      @Dashrender said in Bad Pings from Windows, Good from Linux:

      The windows desktops have the same issue as the VM's do?

      Yeah

      1 Reply Last reply Reply Quote 0
      • scottalanmillerS
        scottalanmiller @DustinB3403
        last edited by

        @DustinB3403 said in Bad Pings from Windows, Good from Linux:

        The speed of the vnics wouldn't be a factor in packets being dropped.

        @scottalanmiller do the windows vms have updated drivers installed?

        I believe you said that the linux and windows systems are using the same vnic device type, correct?

        Totally up to date across the board, yeah. Same NIC and VNIC, yes.

        1 Reply Last reply Reply Quote 0
        • scottalanmillerS
          scottalanmiller @notverypunny
          last edited by

          @notverypunny said in Bad Pings from Windows, Good from Linux:

          Subnet masks set properly across the board?

          Definitely (it's just /24 so easy to get right.)

          1 Reply Last reply Reply Quote 0
          • scottalanmillerS
            scottalanmiller @notverypunny
            last edited by

            @notverypunny said in Bad Pings from Windows, Good from Linux:

            Multiple IP addresses set on the adapters on the windows hosts?

            Nope, looked for that on both sides.

            1 Reply Last reply Reply Quote 0
            • scottalanmillerS
              scottalanmiller @notverypunny
              last edited by

              @notverypunny said in Bad Pings from Windows, Good from Linux:

              Ping by hostname vs ping by ip?

              Only testing IP. Don't believe any DNS entry even exists for the machines in question.

              J 1 Reply Last reply Reply Quote 0
              • J
                JasGot @scottalanmiller
                last edited by

                @scottalanmiller Corrupt Arp Table (cache)?

                notverypunnyN 1 Reply Last reply Reply Quote 0
                • IRJI
                  IRJ @Dashrender
                  last edited by

                  @Dashrender said in Bad Pings from Windows, Good from Linux:

                  is there there a speed difference at which Linux pings vs Windows?

                  https://feelingsec.wordpress.com/2018/01/04/fingerprinting-with-ping/

                  1 Reply Last reply Reply Quote 0
                  • IRJI
                    IRJ @Dashrender
                    last edited by

                    @Dashrender said in Bad Pings from Windows, Good from Linux:

                    is there there a speed difference at which Linux pings vs Windows?

                    Not sure why @DustinB3403 downvoted this, but you are correct.

                    1 Reply Last reply Reply Quote 0
                    • IRJI
                      IRJ @scottalanmiller
                      last edited by

                      @scottalanmiller said in Bad Pings from Windows, Good from Linux:

                      Weird networking issue. We have some Windows machines (mostly server VMs, but desktops too) and some Linux servers on a network with some print servers (old IOGear stuff.) The Linux machines can ping the print servers no problem, 100% success. Linux can ping Windows and vice versa. No network problems at all, until the Windows machines try to ping the print servers. Then there is 15-40% packet loss. We have no idea what could be wrong.

                      There are only two switches and we can't find any correlation there. Nothing is on wifi. Nothing crosses a router boundary.

                      Same physical adapter with Linux vs. Windows VMs the Linux can ping reliably and the Windows cannot!

                      Not many companies even use ping anymore. I'm sure you are testing this because of network performance issues not just solely based on ping.

                      What's the performance issue specifically?

                      scottalanmillerS 1 Reply Last reply Reply Quote 0
                      • notverypunnyN
                        notverypunny @JasGot
                        last edited by

                        @JasGot said in Bad Pings from Windows, Good from Linux:

                        @scottalanmiller Corrupt Arp Table (cache)?

                        In the same vein as this: could there be duplicate MAC addresses in play? Cloned VMs? P2V? Restored / Replicated VMs.... Or someone just trying to get around MAC security somewhere?

                        I assume that physical cables and connections have been checked / swapped / ruled out?

                        scottalanmillerS 2 Replies Last reply Reply Quote 0
                        • scottalanmillerS
                          scottalanmiller @IRJ
                          last edited by

                          @IRJ said in Bad Pings from Windows, Good from Linux:

                          @scottalanmiller said in Bad Pings from Windows, Good from Linux:

                          Weird networking issue. We have some Windows machines (mostly server VMs, but desktops too) and some Linux servers on a network with some print servers (old IOGear stuff.) The Linux machines can ping the print servers no problem, 100% success. Linux can ping Windows and vice versa. No network problems at all, until the Windows machines try to ping the print servers. Then there is 15-40% packet loss. We have no idea what could be wrong.

                          There are only two switches and we can't find any correlation there. Nothing is on wifi. Nothing crosses a router boundary.

                          Same physical adapter with Linux vs. Windows VMs the Linux can ping reliably and the Windows cannot!

                          Not many companies even use ping anymore. I'm sure you are testing this because of network performance issues not just solely based on ping.

                          What's the performance issue specifically?

                          Who doesn't use ping? That's weird. Hard to get more basic than that for layer 2 testing.

                          Yes, the print servers routinely fail from Windows.

                          1 Reply Last reply Reply Quote 0
                          • scottalanmillerS
                            scottalanmiller @notverypunny
                            last edited by

                            @notverypunny said in Bad Pings from Windows, Good from Linux:

                            I assume that physical cables and connections have been checked / swapped / ruled out?

                            Same ones as the pings that work. So physically connections are ruled out.

                            EddieJenningsE DashrenderD 2 Replies Last reply Reply Quote 0
                            • scottalanmillerS
                              scottalanmiller @notverypunny
                              last edited by

                              @notverypunny said in Bad Pings from Windows, Good from Linux:

                              Cloned VMs? P2V? Restored / Replicated VMs

                              I believe that this is the case, but the old ones are definitely powered down.

                              notverypunnyN 1 Reply Last reply Reply Quote 0
                              • EddieJenningsE
                                EddieJennings @scottalanmiller
                                last edited by

                                @scottalanmiller said in Bad Pings from Windows, Good from Linux:

                                @notverypunny said in Bad Pings from Windows, Good from Linux:

                                I assume that physical cables and connections have been checked / swapped / ruled out?

                                Same ones as the pings that work. So physically connections are ruled out.

                                I’m curious. Is there a physical Cisco switch in play?

                                scottalanmillerS 1 Reply Last reply Reply Quote 1
                                • scottalanmillerS
                                  scottalanmiller @EddieJennings
                                  last edited by

                                  @EddieJennings said in Bad Pings from Windows, Good from Linux:

                                  @scottalanmiller said in Bad Pings from Windows, Good from Linux:

                                  @notverypunny said in Bad Pings from Windows, Good from Linux:

                                  I assume that physical cables and connections have been checked / swapped / ruled out?

                                  Same ones as the pings that work. So physically connections are ruled out.

                                  I’m curious. Is there a physical Cisco switch in play?

                                  Nope, checked for any rogue devices. Didn't find any.

                                  1 Reply Last reply Reply Quote 0
                                  • notverypunnyN
                                    notverypunny @scottalanmiller
                                    last edited by

                                    @scottalanmiller said in Bad Pings from Windows, Good from Linux:

                                    @notverypunny said in Bad Pings from Windows, Good from Linux:

                                    Cloned VMs? P2V? Restored / Replicated VMs

                                    I believe that this is the case, but the old ones are definitely powered down.

                                    Hmmmm.... if they're powered down and not unplugged with WoL enabled?

                                    DashrenderD 1 Reply Last reply Reply Quote 0
                                    • DashrenderD
                                      Dashrender @scottalanmiller
                                      last edited by

                                      @scottalanmiller said in Bad Pings from Windows, Good from Linux:

                                      @notverypunny said in Bad Pings from Windows, Good from Linux:

                                      I assume that physical cables and connections have been checked / swapped / ruled out?

                                      Same ones as the pings that work. So physically connections are ruled out.

                                      Actually - I wouldn't be so quick there.

                                      I had a situation 20 years ago where a Windows server would print OK to a printer, but as AS/400 refused to.

                                      Turned out the cable on the printer was less than good. Windows could handle the latency of the traffic to the printer, the AS/400 could not.

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                                      • DashrenderD
                                        Dashrender @notverypunny
                                        last edited by

                                        @notverypunny said in Bad Pings from Windows, Good from Linux:

                                        @scottalanmiller said in Bad Pings from Windows, Good from Linux:

                                        @notverypunny said in Bad Pings from Windows, Good from Linux:

                                        Cloned VMs? P2V? Restored / Replicated VMs

                                        I believe that this is the case, but the old ones are definitely powered down.

                                        Hmmmm.... if they're powered down and not unplugged with WoL enabled?

                                        How does that work for VMs?

                                        And this wouldn't explain the PCs having the same issue.

                                        notverypunnyN 1 Reply Last reply Reply Quote 0
                                        • DashrenderD
                                          Dashrender
                                          last edited by

                                          Do the Windows PCs print direct or through a Windows print server?

                                          scottalanmillerS 1 Reply Last reply Reply Quote 0
                                          • scottalanmillerS
                                            scottalanmiller @Dashrender
                                            last edited by

                                            @Dashrender said in Bad Pings from Windows, Good from Linux:

                                            Do the Windows PCs print direct or through a Windows print server?

                                            Neither. IOGear

                                            DashrenderD 1 Reply Last reply Reply Quote 0
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