Re: DHCP client ID not sent

[Neal Becker <ndbecker2 gmail com>]

On Saturday 13 February 2010, Nathaniel McCallum wrote:
> On 02/13/2010 11:29 AM, Neal Becker wrote:
> > Dan Williams wrote:
> >> On Fri, 2010-02-12 at 15:14 -0500, Nathaniel McCallum wrote:
> >>> On 02/12/2010 03:05 PM, Dan Williams wrote:
> >>>> On Wed, 2010-02-10 at 14:44 -0500, Nathaniel McCallum wrote:
> >>>>> In the connection editor, under IPv4 Settings I can specify a "DCHP
> >>>>> client ID."  I assumed that this ID would be sent to the DHCP server.
> >>>>> Except it isn't.  Is this a bug or a feature?
> >>>>>
> >>>>> NetworkManager-0.7.997-2.git20091214.fc12.x86_64
> >>>>
> >>>> What you get in /var/run/nm-dhclient-ethX.conf during the DHCP
> >>>> request? That's where whatever is in the dhclient field should end up.
> >>>
> >>> It's there:
> >>> send dhcp-client-identifier "myDHCPId"; # added by NetworkManager
> >>>
> >>> The dhcp server is dnsmasq, and sets up dns entries for the dhcp client
> >>> id.  It works for all my windows and mac systems.  But none of my Linux
> >>> systems work (all NM).  My router (which runs dnsmasq) also shows a
> >>> list of dhcp clients and their ids.  Again, win/mac work but NM
> >>> doesn't.
> >>>
> >>> What else should I check?
> >>
> >> Wireshark, to ensure that the client ID gets sent out on the wire.  If
> >> it's in the config file, then that's where NM's sphere of influence
> >> stops (besides ensuring that NM gives the client the right config file,
> >> but that's easy enough to check for in /var/log/messages since NM prints
> >> out the command-line it's running dhclient with).
> >>
> >> Next, wireshark on the server to ensure that the DHCP request comes
> >> through correctly with the client ID.  If it does, then dnsmasq is doing
> >> something badly...
> >>
> >> Dan
> >
> > Did you want DHCP_CLIENT_ID, or maybe you wanted
> > DHCP_HOSTNAME?  The latter is what I need (and nm doesn't seem to
> > support)
> 
> I want whichever one will make dnsmasq do the right thing and assign a
> dns entry for the device.
> 
> Nathaniel
> 

I'm using fedora f12, and on that platform, you can't set DHCP_HOSTNAME 
through nm.  I edit /etc/sysconfig/network-scripts/ifcfg-eth0 and add:
DHCP_HOSTNAME=myhostname

I edit it carefully, to preserve the hard links.  I use emacs and set backup-
by-copying-when-linked to t (IIRC).