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https://bugzilla.redhat.com/show_bug.cgi?id=1075520 Apart from generic checks, we need to constrain netmask/prefix length a bit. Thing is, with current implementation QEMU needs to be able to 'assign' some IP addresses to the virtual network. For instance, the default gateway is at x.x.x.2, dns is at x.x.x.3, the default DHCP range is x.x.x.15-x.x.x.30. Since we don't expose these settings yet, it's safer to require shorter prefix to have room for the defaults. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: laine@laine.org