Re: dhcp6 and fqdn support (for dns)

[Gene Czarcinski <gene czarc net>]

On 09/17/2012 02:24 PM, Gene Czarcinski wrote:
> On 09/17/2012 12:05 PM, Jiri Popelka wrote:
> > On 09/16/2012 09:55 PM, Gene Czarcinski wrote:
> > > BTW, from the info in the dhcp-options man-page, I believe that 
> > > NetworkManager should be doing "send fqdn.fqdn" instead of "send 
> > > host-name" for IPv4.  This should be with a plain name ... not a 
> > > qualified name.  See the man-page.
> > The story behind this is
> > https://bugzilla.redhat.com/show_bug.cgi?id=694758#c20 (NetworkManager)
> > https://bugzilla.redhat.com/show_bug.cgi?id=697877 (initscripts)
> >
> > > OK, bug or feature?
> >
> > Well, me and the original reporter of those bugs had suggested to 
> > "send fqdn.fqdn" when $(hostname) was FQDN and "send host-name" 
> > otherwise, but Bill Nottingham (initscripts) decided to always "send 
> > host-name". So I thought it would be better for NM to stay consistent 
> > with initscripts.
> > Read those BZs and if you think the behavior is wrong you could try 
> > to re-open them.
> I have not gone back to look into the history of what should or should 
> not be sent.  I only looked at what is said in the current (Fedora 
> 17,  dhcp-common-4.2.4-9.P1.fc17) dhcp-options man page.
> ------------
> option fqdn.fqdn text;
>
>  Specifies  the  domain name that the client wishes to use.   This can 
> be a fully-qualified domain name, or a single label.   If there is no 
> trailing  ´.´  character  in the name, it is not fully-qualified, and 
> the server will generally update that name in some  locally-defined 
> domain.
> -----------
>
> It also says that "options fqdn.hostname" and "option fqdn.domainname" 
> should never be set.
>
> When I got things to work, there was a lot of options in the lease 
> file in addition to fqdn.  I am not sure exactly what needs to be 
> specified except that for IPv6 if I specify "-F <homtname>" on the 
> dhclient command line, things work.  For IPv7 "-H <homename>" seems to 
> work.
>
> Regardless, as things now work I do not get dynamic dns update for 
> IPv6 (works fine for IPv4).  This has been with dnsmasq as the dns and 
> dhcp server.  I am not setting up testing on qemu/kvm/libvirt with a 
> guest running named and dhcpd instead of dnsmasq.  My expectation is 
> that it will not do dynamic dns either.
>
> My reason for pushing this is that while using radvd to help with IPv6 
> address assignment works for a client-only situation, it soon falls 
> apart when I have a bunch of systems referring to each other. For IPv4 
> using addresses only is painful, for IPv6 it is impractical.
>
> I believe that such situations will needs either a IPv6 dhcpd with 
> DDNS to named or a dnsmasq.  I do not know, there might be other 
> packages out there but these seem to be common.
https://bugzilla.gnome.org/show_bug.cgi?id=684242

Gene