where does latest dhcp options store?

Edward DeLargy eddelargy at gmail.com
Mon Mar 19 19:15:38 UTC 2012

        The dhclient file name can depend on many variables. The most
important is the DHCP version and operating system. The eth is showing that
is the port the lease is binding to. It is supposed to help admins trouble
shoot. There could be something in the DHCP server sending out serial
numbers if you have anything else in the lease file other than port name or
it could be something about the OS ( I am not sure). The file is not named
dhclient leases due to it being specifically assign to a port. If your
using Network Manager or Yast it would have the dhclient name, but it you
assign with the dhclient ethX command it will have the port name.

Hope that helped.
Ed DeLargy

On Mon, Mar 19, 2012 at 1:03 PM, Chengyu Fan <chengy.fan at gmail.com> wrote:

> Hi~
> Thanks for the help.
> I did as what you told me. When I restart the network service, I find the
> new lease file appeared in the folder is dhclient-xxx...xxx-eth0.lease, I
> don't know what the "xxx" means. (the xxx is a string contains digit, char
> and -). Also I am wondering why the file name is not dhclient.leases.
> Another question is that the file in '/var/lib/dhcp' seems not the result
> of the config file '/etc/dhcp/dhclient.conf', because I added one private
> option in the config file, but it does not show in the leases file. If I
> designated in the command line, the result leases file contains the private
> option information.
> By the way, I downloaded the DHCP source code and installed it.
> On Mon, Mar 19, 2012 at 7:40 AM, Edward DeLargy <eddelargy at gmail.com>wrote:
>> Morning,
>>             Hope this helps:
>>              The dhclient lease information should only be stored in the
>> var/lib/dhclient folder. You should rm -rf * inside that folder to totally
>> clear old info. Also, depending on your dhcp config you may find traces
>> inside the network-scripts for the particular interface. A service network
>> restart should clear anything out after you remove all old files. Those are
>> the only two places I can think of that cache dhclient lease information.
>> If you don't remove the old options eventually the old address could pop
>> back in due to the TTL set in your primary dhcp.conf file.
>> Ed
>> On Sat, Mar 17, 2012 at 12:09 AM, Chengyu Fan <chengy.fan at gmail.com>wrote:
>>> Hi~
>>> Does anyone know that where does the latest dhcp options store?
>>> I released the old lease using "dhclient -r", and then request a new
>>> lease (I add a new option in the config file) using "dhclient ". The option
>>> I mentioned is a private option numbered 246. According to the packets I
>>> captured, the request and response is all OK, but I don't know where does
>>> the dhclient store this option.
>>> I searched the file /var/lib/dhcp/dhclient.leases, but it is not there...
>>> --
>>> Regards,
>>> Chengyu Fan
>>> _______________________________________________
>>> dhcp-users mailing list
>>> dhcp-users at lists.isc.org
>>> https://lists.isc.org/mailman/listinfo/dhcp-users
>> _______________________________________________
>> dhcp-users mailing list
>> dhcp-users at lists.isc.org
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> --
> Regards,
> Chengyu Fan
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
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