dhcp log message

Glenn Satchell Glenn.Satchell at uniq.com.au
Wed Aug 5 23:21:18 UTC 2009

Hi Mike

Looks like this is something that doesn't come up in other
configurations often, so you need to help by giving more information.

I found this mention in dhcp-eval man page:

       In any context where the client  whose  request  is  being
       processed  has  been  assigned  an  IP  address, this data
       expression returns that IP address.  In any context  where
       the  client  whose request is being processed has not been
       assigned an ip address, if this data expression  is  found
       in executable statements executed on that client's behalf,
       a log message indicating "there  is  no  lease  associated
       with this client" is syslogged to the debug level (this is
       considered dhcpd.conf debugging information).

If you refer to the leased-address statement, eg when processing a
DHCPDISCOVER, then there is no IP address assigned. The usual way
around this is to wrap the statement using leased-address within
something that ensures there will be a valid IP at that time.

if option dhcp-message-type = 3 {
	blah blah leased-address blah

All the dhcp Options are described in the dhcp-options man page.

As for why it's appearring, there was a change somewhere where the
default syslog facility cvhanged, now perhaps it matches an existing
debug statement in your syslog.conf? For what it's worth even 3.0.5 is
considered pretty old now, and you should think about moving to 3.1.x
or 4.1.x.


>Date: Wed, 5 Aug 2009 13:28:16 -0400 (Eastern Daylight Time)
>From: Mike Diggins <mike.diggins at mcmaster.ca>
>Sorry to be a pest, but does anyone know what is generating this message 
>in my DHCP logs? I found one reference that said it was a debug message, 
>but it doesn't make it clear to what client it's referring to. If it is a 
>normal DEBUG message, I'm not sure why it's appearing now, and not with my 
>previous version of DHCPD.
>On Fri, 31 Jul 2009, Mike Diggins wrote:
>> I rebuilt one of my DHCP servers earlier this week. Once completed I copied 
>> the dhcpd.leases file over to it, so that it could carry on. The new server 
>> has a different IP address than the original. I'm using the ISC DHCP server 
>> that comes with RHEL, and it got a slight upgrade to V3.0.5-RedHat. I believe 
>> it was 3.0.1 before. I have noticed several of these messages in my log file. 
>> It doesn't appear to be causing any trouble - dhcp seems to work, but what 
>> does it mean?
>> dhcpd: data: "leased-address" configuration directive: there is no lease 
>> associated with this client.
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