Re: [libvirt-users] libvirt and NAT on a system that already has a DHCP server

On 2/1/2018 9:28 AM, Laine Stump wrote: > On 02/01/2018 09:22 AM, Daniel P. Berrangé wrote: >> On Thu, Feb 01, 2018 at 09:19:11AM -0500, Laine Stump wrote: >>> On 01/30/2018 07:37 PM, john(a)bluemarble.net wrote: >>>> I'm trying to use virt-manager and qemu/kvm on Arch Linux. The box I'm >>>> using is also the router for my house. It runs a kea DHCP server. >>>> When I >>>> try to start the default NAT network, it can't start dnsmasq >>>> because that >>>> port is already bound. Is there a way to have it not bind on this >>>> interface? I see there is an except-on statement in the >>>> dnsmasq.conf, but >>>> I can't add lines to that directly, and I didn't see any way to add >>>> special options using virsh net-edit default. >>> >>> The dnsmasq processes run by libvirt to serve dhcp for the virtual >>> networks already does this - they listen *only* on the bridge created >>> for their particular network, nothing else. Your problem is that your >>> host system's dhcp server has been configured to automatically >>> listen on >>> all interfaces. >>> >>> So it's not the configuration of the libvirt network that needs to >>> change, it's the configuration of the host system's dhcp server. It >>> needs to be told that it shouldn't automatically listen on all new >>> interfaces, but to just listen on certain specific interfaces. >> >> Checkout this >> >> https://wiki.libvirt.org/page/Libvirtd_and_dnsmasq > > > Useful for dnsmasq, but he says his host is using "kea dhcp server", > which appears to be some off-shoot of ISC dhcpd, so the config would be > different. > Thanks. I asked on the kea list and they say they don't have a method to do this. Something about raw packets. I may try to switch to dnsmasq for my DHCP server on the machine. For now, I'm back to VirtualBox.