[Dnsmasq-discuss] dbus, --address

[Simon Kelley]

SamLT wrote:
> 
> Hello,
> 
> background: I started to play with IPv6. I'm used to dnsmasq providing
> me a nice local hostnames resolution (hostnames sent via the DHCP
> transaction). well, I'd like something similar with IPv6.
> I'me currently ready about mDNS, DNS-SD &Cie, but my first idea was to
> use a hook script for each DHCP transactions which will add or delete AAAA
> records to dnsmasq depending on the MAC address.
> 
> 
> When I look on the DBUS&dnsmasq page[1], I see that there is no
> --address support and I was wondering whether or not this could be
> usefull to have this?
> 
> 
> I mean, not for my initial idea, I know it's a bad idea for several
> reasons:
>    -> there is the privacy extension which means the IPv6 address won't
>    be using the mac address
>    -> AAAA record for PC not having IPv6 connectivity might cause some
>    problems
>    -> IPv6 only hosts will still be missing their AAAA records...
> 
> 
> Anyway, as I regularly blacklist new domains, I thought this might be a
> nice addition? I know restarting dnsmasq should not be a problem, but
> may be that's something quick to add? I just don't know?
> 
> to be honnest, I don't much about DBUS either, but writing a small
> script to add or remove --address directive would be a good opportunity
> to learn about it.
> 
> 
> What do you think?

For playing, write a script which maintains the addresses in an
/etc/hosts formant file, tell dnsmasq to use that file with
--addn-hosts, and send SIGHUP to get the file to be re-read. That way
you don't need any changes to the dnsmasq code. As a long term solution,
 I thing your list of problems is valid and means it's probably not a
good idea, but I'm not an IPv6 expert, like most people currently.
> 
> 
> I know Simon is now "seriously thinking" about adding DHCPv6 support to
> dnsmasq. So I may add one question about it:
> 
> Is the DHCPv6 server able to advertise new settings? Or do the clients
> have to wait for their lease to expire (or half that time IIRC) to
> negociate new parameters?

DHCPv6 adds a RECONFIGURE packet which the server can send to the client
 at any time to tell it to get new parameters. I'd expect to support
that eventually, but it's not high priority for implementation.


Cheers,

Simon.


> 
> 
> Thank you all!
> 
> 
> 
> [1] http://www.thekelleys.org.uk/dnsmasq/docs/DBus-interface
> 
> 
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