addding "CID" and leased address to logging

Glenn Satchell glenn.satchell at
Fri Aug 24 11:15:20 UTC 2012

man dhcp-eval:

     log (priority, data-expr)

       Logging statements may be used to send information to  the
       standard  logging  channels.  A logging statement includes
       an optional priority (fatal, error, info, or debug), and a
       data expression.

       Logging statements take  only  a  single  data  expression
       argument,  so  if you want to output multiple data values,
       you will need to use the concat  operator  to  concatenate

You need to ensure that anything concatenated is not a null string,
otherwise the whole concatenated string is null.

The logging destination is done through the log-facility command (see
dhcpd.conf(5) and subsequently syslog.conf.


On Fri, August 24, 2012 6:35 pm, raz khan wrote:
> Many thanks Niall.I will try the suggested method. However I would like to
> find out if there is any documentation about using "info concat(.." in the
> dhcpd.conf file? I have checked various resources, but nothing mentioned.
> Can anyone point me to the right source?
> ThanksRK
>> Subject: Re: addding "CID" and leased address to logging
>> From: Niall.oReilly at
>> Date: Wed, 22 Aug 2012 17:41:49 +0100
>> To: dhcp-users at
>> On 22 Aug 2012, at 17:31, raz khan wrote:
>> > This information is passed on to the lease file but not to the default
>> log file.
>> The kind of thing you seem to need is discussed in the archives.  Try
>> Niall O'Reilly
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>> dhcp-users at
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