Re: Grrrr ... dhcpd6

[Dan Williams <dcbw redhat com>]

On Fri, 2012-09-28 at 06:54 -0400, Gene Czarcinski wrote:
> On 09/27/2012 04:22 PM, Gene Czarcinski wrote:
> > OK, anyone have any experience sending commands, requests etc. via 
> > dhclient?
> >
> > I have my patch fixed up so that it works from a conf file rather than 
> > "-F" on the commandline since that is a "Red Hat ism".
> >
> > I am asking for some stuff and I get little back from dhcpd6 [that is 
> > using radvd, named, dhcpd, and dhcpd6 to provide services].  On the 
> > other hand, I get pretty much what I asked for from dnsmasq [radvd and 
> > dnsmasq provide the services].  In fact, I based what I put in by what 
> > dnsmasq was delivering without bein asked.
> >
> > Anyway, here is nm-dhclient6-eth0.conf
> > ----------------
> > # Created by NetworkManager
> >
> > send fqdn.fqdn "f17user28";
> > send fqdn.encoded on;
> > send fqdn.no-client-update on;
> > send fqdn.server-update on;
> > also request fqdn.fqdn;
> > also request fqdn.hostname;
> > also request fqdn.domainname;
> > also require dhcp6.name-servers;
> > also request dhcp6.fqdn;
> > also request dhcp6.hostname;
> > also request dhcp6.domainname;
> > also request dhcp6.domain-search;
> > also request dhcp6.client-id;
> > also request dhcp6.server-id;
> > -------------------
> >
> > And here is dhclient6-<asdad>-eth0.lease
> > ---------------------
> > lease6 {
> >   interface "eth0";
> >   ia-na 00:e6:01:85 {
> >     starts 1348776391;
> >     renew 0;
> >     rebind 0;
> >     iaaddr fd00:dead:beef:28::2fe {
> >       starts 1348776391;
> >       preferred-life 7200;
> >       max-life 21600;
> >     }
> >   }
> >   option dhcp6.client-id 0:1:0:1:17:f7:6e:46:52:54:0:e6:1:85;
> >   option dhcp6.server-id 0:1:0:1:17:f7:6d:f9:52:54:0:15:48:2;
> >   option dhcp6.name-servers fd00:dead:beef:28::91;
> >   option dhcp6.domain-search "vtest.";
> > }
> > -----------------
> >
> > Any insight would be appreciated.  The patch is "almost there" but I 
> > would really like to understand this.
> >
> > BTW, on the client side stuff is working in that I get dhcpd6 
> > addresses and dns update with a RA route.  This is both for 
> > radvd/dnsmasq and radvd/named/dhcpd/dhcpd6 configurations.  Yup, that 
> > auto stuff really works nicely.
> A little more information.  I re-ran my test but this time I had 
> wireshark running on the server.
> 
> The requests for fqdn.fqdn, fqdn.hostname, fqdn.domainname, dhcp6.fqdn, 
> dhcp6.hostname, and dhcp6.domainname were not sent from the dhclient to 
> the server.  Whether dhcpd6 could/would supply the info is not known 
> since dhclient never asked.  At this point I am going to just drop those 
> requests. The dynamic dns update is done and the address is supplied.  I 
> do not feel up to digging into dhclient code to see what is screwed up 
> there.
> 
> At least stuff works.

Ok, so at least the client is sending the DDNS stuff to the server.  At
this point we'll take what we can get :)

Dan