[Dnsmasq-discuss] dnsmasq 2.62-3 as DHCPv6-Server and RA-Server: Bug sending router's link-local instead of global address as gateway and DNS-server?

Martin Babutzka martin.babutzka at online.de
Tue Jan 21 13:02:58 GMT 2014

Thanks for the replies! I hesitantly updated to dnsmasq-2.68 since I first
wanted to stick to the version provided with Debian wheezy. The quiet-options
really reduce the amount of syslog messages except for: "dnsmasq-dhcp[23663]: no
address range available for DHCPv6 request via eth5"

Concerning the link-local addresses it actually looks like this is the default
when advertising gateways in local networks. Unfortunately other software to
proxy/relay dhcpv6 and ra can not handle it properly. It is basically possible
to also advertise the routers global address (see here:
http://www.macfreek.nl/memory/Non-Local_IPv6_Router_Advertisement and the RFC
here: http://tools.ietf.org/html/rfc6275#section-7.2 ). Is this option also
available in dnsmasq? In radvd it is called "AdvRouterAddr on;".

Many regards,

> Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk> hat am 21. Januar 2014
> um 12:16 geschrieben:
>  On 21/01/2014 10:40, Martin Babutzka wrote:
>      > >      Hello,
> > 
> >      We are using this great piece of software so far as DNS cacher but want
> > to implement it also as IPv6 server by now. DHCPv4 is handled by another
> > software at the moment (isc-dhcp-server) but we think the dnsmasq 2.62-3 is
> > quite suitable for our need of an DHCPv6- and RA-server.
> > 
> >      I activated the features in dnsmasq.conf which I think should set-up a
> > working DHCPv6/RA-Server (see compressed config file below). From then on
> > the server distributed ipv6-addresses from the correct range. Unfortunately
> > some error occured: As wanted it also distributed Gateway and DNS-server but
> > it used the LINK-LOCAL v6 address of the corresponding interface instead of
> > the Global configured address (2010:7d0:904:1202::1). Is this a bug or
> > misconfiguration?
> > 
> >      Another independent question: With this configuration dnsmasq starts to
> > be pretty noisy in the syslog. Is there any option to reduce the verbosity
> > once the system works?
> > 
> > 
> >  > v2.68 includes 'quiet-dhcp, quiet-dhcp6 & quiet-ra' options which
> >  > significantly help the syslog noise.
>  I think it's correct behaviour to advertise the link-local address.
>  Hope that helps.
>  Kevin

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