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dnsmasq documentation says that the *IPv4* prefix/network address/broadcast address sent to dhcp clients will be automatically determined by dnsmasq by looking at the interface it's listening on, so the original libvirt code did not add a netmask to the dnsmasq commandline (or later, the dnsmasq conf file). For *IPv6* however, dnsmasq apparently cannot automatically determine the prefix (functionally the same as a netmask), and it must be explicitly provided in the conf file (as a part of the dhcp-range option). So many years after IPv4 DHCP support had been added, when IPv6 dhcp support was added the prefix was included at the end of the dhcp-range setting, but only for IPv6. A user had reported a bug on a host where one of the interfaces was a superset of the libvirt network where dhcp is needed (e.g., the host's ethernet is 10.0.0.20/8, and the libvirt network is 10.10.0.1/24). For some reason dnsmasq was supplying the netmask for the /8 network to clients requesting an address on the /24 interface. This seems like a bug in dnsmasq, but even if/when it gets fixed there, it looks like there is no harm in just always adding the netmask to all IPv4 dhcp-range options similar to how prefix is added to all IPv6 dhcp-range options. Signed-off-by: Laine Stump <laine@laine.org> Reviewed-by: John Ferlan <jferlan@redhat.com>
20 lines
666 B
Plaintext
20 lines
666 B
Plaintext
##WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
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##OVERWRITTEN AND LOST. Changes to this configuration should be made using:
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## virsh net-edit default
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## or other application using the libvirt API.
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##
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## dnsmasq conf file created by libvirt
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strict-order
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except-interface=lo
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bind-dynamic
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interface=virbr0
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dhcp-range=192.168.122.2,192.168.122.254,255.255.255.0
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dhcp-no-override
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dhcp-authoritative
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dhcp-lease-max=253
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dhcp-hostsfile=/var/lib/libvirt/dnsmasq/default.hostsfile
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addn-hosts=/var/lib/libvirt/dnsmasq/default.addnhosts
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dhcp-option=option:mtu,7000
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dhcp-range=2001:db8:ac10:fe01::1,ra-only
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dhcp-range=2001:db8:ac10:fd01::1,ra-only
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