Instructing dhclient to set hostname of client

[Doug Barton]

Joe Holden wrote:
> Brooks Davis wrote:
>> On Tue, Oct 24, 2006 at 09:16:07AM +0200, Harti Brandt wrote:
>>> On Mon, 23 Oct 2006, Joe Holden wrote:
>>>
>>> JH>Andrey V. Elsukov wrote:
>>> JH>> Doug Barton wrote:
>>> JH>>> If you're talking about a laptop where you're not sure what the DHCP
>>> JH>>> server is going to send you, then I have this in /etc/rc.local:
>>> JH>> 
>>> JH>> Hi, Doug.
>>> JH>> 
>>> JH>> What you think about adding a new feature to dhclient - Alternate IP
>>> JH>> Configuration. This configuration can be specified in dhclient.conf
>>> JH>> and take effect when a DHCP server not respond. MS Windows have a
>>> JH>> similar feature.
>>> JH>> 
>>> JH>Really I was hoping dhclient would have this sort of functionality where
>>> JH>it would resolve the ip given and set that as hostname, as as far as im
>>> JH>aware, isc-dhcpd will not send hostnames?
>>>
>>> Sure it does. On my machines I set hostname to "" in rc.conf and let 
>>> dhclient set it. Works fine.
>> Once upon a time I implemented some code to add a default_hostname
>> variable to rc.conf which was then used by the startup scripts and
>> dhclient-script to allow the local network to override the name if
>> desired while insuring that the system had a name at all times (required
>> for laptop use).  I'd take patches to do this.
>>
>> -- Brooks
>>
>> P.S. hacking this into rc.local won't work longterm because addresses
>> will be assigned in a totally different context.

I wasn't suggesting it as a long term fix, I was just trying to answer 
the OP's question. :)

> I wrote an rc.d script called updatehost that does this, its called
> after other net scripts, and basically gets the ip from $interface (set
> by updatehost_flags="blah0" in rc.conf, and resolves that, seems to
> work, a dirty hack but it does the trick.

My only concern with that as a longer term solution would be not 
interfering with a hostname set by dhclient if one exists. I'd have to 
think more about the different possible combinations here ...

Doug

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