Can't send DHCP options

Glenn Satchell Glenn.Satchell at
Mon Feb 25 11:24:44 UTC 2008

Hi James

/etc/dhclient.conf is the default in the isc distributed source code.
Many distros choose to modify this to comply with file naming policies.
I'll bet 3.0.4 came with your distro, and 4.1.0a1 was built by yourself

man dhclient.conf will have all the right paths in it, as the install
process modifies the man pages.


>From: "James" <jmsliang at>
>To: <dhcp-users at>
>Subject: RE: Can't send DHCP options
>Date: Mon, 25 Feb 2008 11:07:42 +0800
>Thank you.
>I used ISC DHCP Client 3.0.4 version. Now I use ISC DHCP Client 4.1.0a1
>I meet a problem that I add options in /etc/dhcp3/dhclient.conf. After
>executing 'dhclient eth0', I find that options I add can't work. Finally, I
>	In Client 4.1.0a1 version, the default path of dhclient.conf is
>	But in ISC DHCP Client 3.0.4 , the default path of dhclient.conf is
>/etc/dhcp3/dhclient.conf. That is different between 4.1.0a1 and 3.0.4.
>So I copy /etc/dhcp3/dhclient.conf to /etc/dhclient.conf, and add options
>into it, the options I add really work.
>But I still meet a problem without solving.
>I modify the content of 'etc/dhcp3/dhclient-enter-hooks.d/debug' :
>	# To enable this script set the following variable to "yes".
>	RUN = "yes"
>And I change the access permissions of 'debug' file to '755' (chmod 755
>I copy this file to /etc/dhclient-enter-hooks directory. After executing
>'dhclient eth0', I don't find the file 'dhclient-script.debug' in 'tmp'
>I don't know what the problem is. What shall I do?
>Thakn you.
>-----Original Message-----
>From: dhcp-users-bounce at [mailto:dhcp-users-bounce at] On Behalf
>Of Simon Hobson
>Sent: Friday, February 22, 2008 5:46 PM
>To: dhcp-users at
>Subject: RE: Can't send DHCP options
>James wrote:
>>I delete the dhclient.conf in /etc/dhcp3/ directory, and I find the 
>>dhclient still CAN work.
>>Why? If I don't provide the dhclient.conf file, how does dhclient 
>>know what to do?
>You do not have to configure anything at all for a basic DHCP client 
>to be able to function - that is the whole point of DHCP. In the 
>absence of a config that says otherwise, the client will simply get 
>and process a default set of options - eg it will ask for basic 
>network parameters (address, mask, gateway, DNS servers) and 
>configure the network and resolver accordingly.

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