Re: Grrrr ... dhcpd6

[Gene Czarcinski <gene czarc net>]

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.

Gene