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    Host crash brings down network

    Scheduled Pinned Locked Moved Compute
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    • S Offline
      Strijd
      last edited by

      I have been using XCP-NG for a home lab and experimenting with different server software and have gotten by with very little trouble, but now I have an issue and I don't even know where to start trying to resolve it.

      My host is an older computer I built in 2015, after building a new PC I put xcp-ng on it to play around.

      i7-4790k
      16gb ram
      nvme drive and a few ssds
      an old amd tahiti 7970 that is not being passed through to anything, yet

      it is connected to a switch that has my other computer attached, which goes to another switch, which leads to the router and ends at the modem.

      I have found that occasionally while trying to start a newly made windows 10 vm that I was going to pass the gpu through to, starting windows 10 will break everything.

      I found that the order things seem to happen is :

      I start VM
      VM looks like it is going to boot, but then the console view in xoa stops working
      xoa disconnects
      ~15 seconds later all network activity on any device connected by ethernet stops working. But wifi still works.

      All network activity over ethernet will stay down until I hold the power button down on my host to kill it and bring it back up.

      When this has happened I am unable to ssh anything or use xoa for anything.

      Any suggestions on how to figure out what is happening?

      S 1 Reply Last reply Reply Quote 0
      • S Offline
        Strijd @Strijd
        last edited by

        A few more details,

        This happens about 50% of the time while trying to start the windows 10 vm.

        It is only this VM, and I have tried deleting it and making another windows 10 with the same result.

        the ethernet network comes up immediately after killing the host. by running a continuous ping I can restore the network after a single missed packet if I am quick enough.

        there are about 5 pcs plugged in to ethernet that this effects

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        • DanpD Offline
          Danp Pro Support Team
          last edited by

          I would start by checking the logs -- https://xcp-ng.org/docs/troubleshooting.html

          How is networking configured on the problematic VM (ie: static IP vs DHCP). From you description, it sounds like you may have an IP address conflict.

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          • S Offline
            Strijd @Danp
            last edited by

            @danp The vm is set to dhcp with the virtual nic pulling an IP from a pfsense vm I am running on the same host.

            I do have a mac reservation set for the host, xoa, and pfsense

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            • S Offline
              Strijd
              last edited by

              After removing the GPU I am unable to replicate the issue.

              I have put the GPU back in and still cannot get the issue to happen again.

              Issue must have been some hardware related issue, but I'm still at a loss as to how things happened the way they did.

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