Never mind, I have found the reason. When libvirtd started, it will create
bridge virbr0 and then write 1 to /proc/sys/net/ipv4/ip_forward (0 in default).
Set ip_forward from 0 to 1 will cause ixgbe driver reset NIC, so the network
broke for a while.
> -----Original Messages-----
> From: "Genghuang Wang" <wangtianjiao.wang959@xxxxxxxxx>
> Sent Time: 2018-02-24 14:34:16 (Saturday)
> To: "CentOS mailing list" <centos@xxxxxxxxxx>
> Cc:
> Subject: Re: Network broke for a while when libvirtd start
>
> Hello
>
> > When start service libvirtd by
> >
> > service libvirtd start
> >
>
> > OS: CentOS 6.5
> > libvirt: libvirt-daemon-1.2.5-1.mira1.x86_64
>
> https://www.redhat.com/mailman/listinfo/libvirt-users
> is the official mailing list for the libvirt daemon, maybe you can ask
> in there and get better support.
>
> > Does anyone know the reason?
>
> This mailing list is for the general usage of the CentOS system, I am
> afraid that not many experts about libvert could be found here.
>
> If you ask in the most appropriate mailing list, you may get the
> quickest and the most helpful assistance.
> _______________________________________________
> CentOS mailing list
> CentOS@xxxxxxxxxx
> https://lists.centos.org/mailman/listinfo/centos
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