[CentOS] DHCP_HOSTNAME in ifcfg-eth0

Tue Nov 29 16:04:42 UTC 2011
Scot P. Floess <sfloess at nc.rr.com>

Sounds to me like you want to set up DDNS internally?  I do that for my 
home network - but you need to have both DHCP and DNS working 
together...meaning DHCP needs to be able to update the DNS server with the 
names of the DHCP clients.  I've got a Linksys router and have never 
gotten that to work with it (I haven't tried), but I have a CentOS box 
acting as both my DNS server and DHCP server.  I also spin up VMs that use 
DHCP...my kickstart file actually write the DHCP client name into 
ifcfg-eth0, so when the DHCP clients start up I can refer to them by 

On Tue, 29 Nov 2011, Timothy Madden wrote:

> On 29.11.2011 15:57, Timothy Madden wrote:
>> Hello
>> Is there a way for the dhcp client to send the current host name of the
>> machine when requesting a lease ?
>> Currently I have to include a line like
>> 	DHCP_HOSTNAME=appserver2
>> in my /etc/sysconfig/network-scripts/ifcfg-eth0, but I would like to
>> tell the dhcp client to just 'also send the hostname' and then the
>> client to get the current hostname itself, instead of having the name
>> hard-coded in the ifcfg-eth0 file.
>> I am trying to get my router to know the names of all my CentOS
>> machines, as currently I can access none of my CentOS machines by their
>> node name (I get 'unknown host' upon name lookup) and maybe it will help
>> if the router knows all the computer names.
> Sorry for the wrong wording: what I want is the DHCP client to send the
> hostname when a lease is requested, but I do not want to give dhclient
> any explicit hostname to be sent.
> I want dhclient to read the hostname from `hostname` or from
> /etc/sysconfig/network or any other way, and use that name to send the
> hostname to DHCP server.
> Thank you,
> Timothy Madden
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Scot P. Floess             RHCT  (Certificate Number 605010084735240)
Chief Architect FlossWare  http://sourceforge.net/projects/flossware