Build a custom log entry on a DHCPACK CentOS 6.
Mark Haney
mark.haney at neonova.net
Tue May 30 16:40:58 UTC 2017
Well, I think I've found the issue, and it's not with dhcpd. We
originally had the log-facility option set to local7. I'm thinking that
this, coupled with the fact that the custom log we're creating caused it
to log twice. Once I removed the local7 logging most of that stopped.
Now it only logs on a DHCPACK for most leases. Turns out, we have a few
of our customers with multiple routes to devices and that certain leases
are being handled by two routers. So, we'll get an ACK going out from
the dhcp server to two different IPs. So, it's not actually duplicate
logging, just logging the same data from two different router IPs.
So, everything looks good now. Thanks for the help.
On 05/30/2017 12:05 PM, Bob Harold wrote:
>
> On Tue, May 30, 2017 at 8:02 AM, Mark Haney <mark.haney at neonova.net
> <mailto:mark.haney at neonova.net>> wrote:
>
> Well, it sort of works that way. The issue now is it is logging
> it twice. Which doesn't make sense to me in any way. I only
> posted half the 'if' statement, but logically the else shouldn't
> matter. Why is /on commit/ logging 2 (and sometimes 3) entries
> for one DHCPACK?
>
> That is really strange. I am not seeing that behavior on my server.
>
> --
> Bob Harold
>
> On 05/26/2017 03:23 PM, Bob Harold wrote:
>>
>> On Fri, May 26, 2017 at 3:08 PM, Mark Haney
>> <mark.haney at neonova.net <mailto:mark.haney at neonova.net>> wrote:
>>
>> Okay, let me see if I get this straight, I should wrap the
>> entire if statement inside an 'on commit {}' block?
>>
>>
>> Yes
>>
>> on commit {
>> if exists agent.circuit-id
>> {
>> log (info, concat( "DHCPUSER:,", concat (suffix (concat ("0",
>> binary-to-ascii (16, 8, "", substring( hardware, 1, 1))),2), ":",
>> suffix (concat ("0", binary-to-ascii (16, 8, "",substring(
>> hardware, 2, 1))),2), ":", suffix (concat ("0",
>> binary-to-ascii(16, 8, "", substring( hardware, 3, 1))),2), ":",
>> suffix (concat ("0", binary-to-ascii (16, 8, "", substring(
>> hardware, 4, 1))),2),":", suffix (concat ("0", binary-to-ascii
>> (16, 8, "", substring( hardware, 5, 1))),2), ":", suffix (concat
>> ("0", binary-to-ascii (16, 8, "", substring( hardware, 6,
>> 1))),2)), ",IP:,", binary-to-ascii (10, 8, ".", leased-address),
>> ",CID:,", option agent.circuit-id));
>> }
>> }
>>
>> --
>> Bob Harold
>>
>> On Fri, May 26, 2017 at 2:56 PM, Bob Harold
>> <rharolde at umich.edu <mailto:rharolde at umich.edu>> wrote:
>>
>>
>> On Fri, May 26, 2017 at 11:38 AM, Mark Haney
>> <mark.haney at neonova.net <mailto:mark.haney at neonova.net>>
>> wrote:
>>
>> We've got a custom log entry created that's based on
>> whether the agent.circuit-id exists. The problem is
>> that the circuit-id gets included in DHCPDISCOVER and
>> DHCPOFFER, so we're getting duplicate custom messages
>> logged.
>>
>> What we want to do it create this custom log file,
>> with the circuit-id only on the DHCPACK. The log
>> creation params are below. We use this so that
>> customers can get a web interface view of the current
>> leases.
>>
>> Is there a way to do this with the latest CentOS 6
>> dhcpd package?
>>
>> ----
>> if exists agent.circuit-id
>> {
>> log (info, concat( "DHCPUSER:,", concat
>> (suffix (concat ("0", binary-to-ascii (16, 8, "",
>> substring( hardware, 1, 1))),2), ":", suffix (concat
>> ("0", binary-to-ascii (16, 8, "",substring( hardware,
>> 2, 1))),2), ":", suffix (concat ("0",
>> binary-to-ascii(16, 8, "", substring( hardware, 3,
>> 1))),2), ":", suffix (concat ("0", binary-to-ascii
>> (16, 8, "", substring( hardware, 4, 1))),2),":",
>> suffix (concat ("0", binary-to-ascii (16, 8, "",
>> substring( hardware, 5, 1))),2), ":", suffix (concat
>> ("0", binary-to-ascii (16, 8, "", substring(
>> hardware, 6, 1))),2)), ",IP:,", binary-to-ascii (10,
>> 8, ".", leased-address), ",CID:,", option
>> agent.circuit-id));
>> }
>>
>>
>> --
>> photo
>> Mark Haney
>> Network Engineer at NeoNova
>>
>> 919-460-3330 <tel:%28919%29%20460-3330> (opt 1) •
>> mark.haney at neonova.net <http://matt@neonova.net/>
>> www.neonova.net <https://neonova.net/>
>> <https://www.facebook.com/NeoNovaNNS/>
>> <https://twitter.com/NeoNova_NNS>
>> <http://www.linkedin.com/company/neonova-network-services>
>>
>>
>>
>>
>> Try wrapping that with:
>> on commit {
>> ...
>> }
>>
>> Then it should only happen once, when the lease is granted.
>>
>> --
>> Bob Harold
>>
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>>
>>
>>
>>
>> --
>> photo
>> Mark Haney
>> Network Engineer at NeoNova
>>
>> 919-460-3330 <tel:%28919%29%20460-3330> (opt 1) •
>> mark.haney at neonova.net <mailto:mark.haney at neonova.net>
>> www.neonova.net <https://neonova.net/>
>> <https://www.facebook.com/NeoNovaNNS/>
>> <https://twitter.com/NeoNova_NNS>
>> <http://www.linkedin.com/company/neonova-network-services>
>>
>>
>
>
>
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