[libvirt] Proposed: replace radvd with dnsmasq for Router Advertizing

Gene Czarcinski gene at czarc.net
Fri Nov 2 16:39:06 UTC 2012

On 11/02/2012 11:58 AM, Jiri Denemark wrote:
> On Fri, Nov 02, 2012 at 08:25:42 -0400, Gene Czarcinski wrote:
>> I have been doing some testing and dnsmasq is capable of handling the
>> service currently provided by radvd.  To implement this in dnsmasq
>> requires the following:
>> if an IPv6 dhcp-range is specified, then add:
>>         enable-ra
>> if no IPv6 dhcp-range is specified, then add:
>>         dhsp-range=<IPv6-subnet>,ra-only
>> Tested.  The second one will work with basic dnsmasq-2.6.3.  The first
>> one and dhcp-range itself only works with dnsmasq-2.64 (when released)
>> or dnsmasq-2.63+patches.
>> Since dnsmasq-2.48 does not support IPv6 dhcp but does handle IPv6 for
>> dns and CentOS 6 does include radvd, I also propose that a libvirtd.conf
>> option be added.  If the option is not present or set off, then radvd is
>> used.  If the option is set on, then dnsmasq is used.
> I think this should rather be handled by configure script (perhaps with an
> additional option if needed). Otherwise, I agree with the plan.
I can do that but then the individual backporting to (for example) 
CentOS 6 with dnsmasq-2.48 would have to do nothing if DHCPv6 is not 
wanted and, if DHCPv6 is wanted, to simply install dnsmasq-2.63+ and 
change a libvirtd.conf parameter.

If the default is to use dnsmasq, then there are going to be mistakes 
made.  If the default is to use radvd, then many systems will not change.


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