On 07/10/2012 09:55 PM, taget(a)linux.vnet.ibm.com wrote: Nothing is missing. what does virsh net-list, virsh net-dumpxml default and virsh dumpxml <your guest> say? please make sure your guest is using 'default' network. In addition, please show your libvirt, kvm and dnsmasq verstion, thanks.

On 07/10/2012 09:55 AM, taget(a)linux.vnet.ibm.com wrote: There's nothing wrong with the dnsmasq commandline. Before anything else, try restarting libvirtd. This will reload the iptables rules that libvirtd installs to (among other things) allow incoming dhcp requests from guests to the host. Some other program messing with the iptables rules is the most common cause of this problem. For a couple other possibilities, you can look at the following entry in the libvirt troubleshooting guide: http://wiki.libvirt.org/page/PXE_boot_%28or_dhcp%29_on_guest_failed (If you find a root cause different from the 3 listed there, please edit the page to add your findings). For future reference, here's the toplevel of the troubleshooting guide: http://wiki.libvirt.org/page/Troubleshooting