Using the private DHCP 224 to 254 for DHClient

Debanjan Biswas (debiswas) debiswas at
Fri Dec 17 12:41:46 UTC 2010

Thanks for the info Glenn. I tried using the Request option in the
dhclient.conf file. But, was of not much help.

Below is the example of the file

Interface eth0 {
	request subnet-mask, broadcast-address, log-server, time-offset,
routers, domain-name, domain-name-servers;
	script "/sbin/dhclient-script";

More importantly in the DHCP server I have added a proprietary option
224 (which is reserved for private use). Now, I want the DHClient to add
this 224 option in the DHCP Discovery request? I could not get it done.

Could you please inform me how to resolve this issue.

Thanking you in advance.


-----Original Message-----
From: at
[ at] On Behalf
Of Glenn Satchell
Sent: Friday, December 17, 2010 6:02 PM
To: Users of ISC DHCP
Subject: Re: Using the private DHCP 224 to 254 for DHClient

On 12/17/10 22:02, Debanjan Biswas (debiswas) wrote:
> Hi Everyone,
> How do I make sure that Dhclient include the private dhcp options 224
> the DHCP server in the DHCP discovery request?
> I am using DHClient version 3.0.5.
> Thanking you in advance.
> Regards
> Debanjan

Have a look at the dhclient.conf man page. You probably want "also 
request" or "send".

"also request" asks the server to send back the named options in the 
response. For example domain-name-servers.

"send" is used to send an option to the server, such as the hostname.

The dhcp-options man page lists all the standard options. See the 
section "DEFINING NEW OPTIONS" for the syntax to define the options you 
are interested in. You need to specify the type so that dhclient can 
decode them appropriately (eg whether they are a text string, integer, 
IP address, etc. You need matching option definitions on the dhcp


dhcp-users mailing list
dhcp-users at

More information about the dhcp-users mailing list