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According to the dnsmasq manpage, the netmask for IPv4 address ranges will be auto-deteremined from the interface dnsmasq is listening on, but it can't do this for IPv6 for some reason - it instead assumes a network prefix of 64 for all IPv6 address ranges. If this is incorrect, dnsmasq will refuse to give out an address to clients, instead logging this message: dnsmasq-dhcp[2380]: no address range available for DHCPv6 request via virbr0 The solution is for libvirt to add ",$prefix" to all IPv6 dhcp-range arguments when building the dnsmasq.conf file. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1033739
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>