<html><body><div>Hi Daniel,</div><div> </div><div># ls /usr/share/libvirt/ cpu_map.xml libvirtLogo.png schemas No "network" folder found # locate default.xml /etc/libvirt/storage/default.xml /etc/libvirt/storage/autostart/default.xml /home/satimis/.config/libvirt/storage/default.xml /home/satimis/.config/libvirt/storage/autostart/default.xml /usr/share/gutenprint/5.2/xml/escp2/inputslots/default.xml</div><div> </div><div> </div><div>Besides # ls /etc/libvirt/qemu/networks/ autostart NAT.xml # ls /etc/libvirt/qemu/networks/autostart/ NAT.xml There are 2 NAT.xml file of same content # cat /etc/libvirt/qemu/networks/NAT.xml  <network> <name>NAT</name> <uuid>2b550fe1-cff0-476e-aabe-f8a239231315</uuid> <bridge name='virbr0' stp='on' delay='0'/> <mac address='52:54:00:a6:37:e4'/> <domain name='NAT'/> <ip address='192.168.100.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.100.128' end='192.168.100.254'/> </dhcp> </ip> </network></div><div> # cat /etc/libvirt/qemu/networks/autostart/NAT.xml  <network> <name>NAT</name> <uuid>2b550fe1-cff0-476e-aabe-f8a239231315</uuid> <bridge name='virbr0' stp='on' delay='0'/> <mac address='52:54:00:a6:37:e4'/> <domain name='NAT'/> <ip address='192.168.100.1' netmask='255.255.255.0'> <dhcp> <range start='192.168.100.128' end='192.168.100.254'/> </dhcp> </ip> </network> Regards SL </div><div> </div><div> </div> <blockquote id="replyBlockquote" webmail="1" style="border-left: 2px solid blue; margin-left: 8px; padding-left: 8px; font-size:10pt; color:black; font-family:verdana;"> <div id="wmQuoteWrapper"> -------- Original Message -------- Subject: Re: [libvirt] networking problem From: "Daniel P. Berrange" <<a href="mailto:berrange@redhat.com">berrange@redhat.com</a>> Date: Thu, November 02, 2017 9:31 am To: Stefan Hajnoczi <<a href="mailto:stefanha@gmail.com">stefanha@gmail.com</a>> Cc: <a href="mailto:msliu@reynoldstocks.com">msliu@reynoldstocks.com</a>, <a href="mailto:libvir-list@redhat.com">libvir-list@redhat.com</a>, <a href="mailto:kvm@vger.kernel.org">kvm@vger.kernel.org</a> On Thu, Nov 02, 2017 at 09:24:22AM +0000, Stefan Hajnoczi wrote: > On Sun, Oct 29, 2017 at 04:07:09AM -0700, <a href="mailto:msliu@reynoldstocks.com">msliu@reynoldstocks.com</a> wrote: > > I have performed following steps: > > > > $ virsh net-destroy default > > $ virsh net-undefine default > > > > Now I couldn't start guest with following warning popup: > > Error starting domain: Network not found: no network with matching name > > 'default' > > > > Please advise how to re-create 'default' instead of reinstalling all > > guests. > > This is a libvirt question. I have CCed the libvirt mailing list so you > can continue discussion there. > > On Red Hat-based distros try reinstalling the > libvirt-daemon-config-network package. On Debian-based distros try > reinstalling the libvirt-daemon-system package. This should restore the > /etc/libvirt/qemu/networks/default.xml file that you are missing. No need to re-install those RPMs - Libvirt leaves a copy of the stock XML file at /usr/share/libvirt/networks/default.xml. So just run virsh define /usr/share/libvirt/networks/default.xml virsh start default Regards, Daniel -- |: <a href="https://berrange.com">https://berrange.com</a> -o- <a href="https://www.flickr.com/photos/dberrange">https://www.flickr.com/photos/dberrange</a> :| |: <a href="https://libvirt.org">https://libvirt.org</a> -o- <a href="https://fstop138.berrange.com">https://fstop138.berrange.com</a> :| |: <a href="https://entangle-photo.org">https://entangle-photo.org</a> -o- <a href="https://www.instagram.com/dberrange">https://www.instagram.com/dberrange</a> :| </div> </blockquote></body></html>