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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)); }
-- | Mark Haney Network Engineer at NeoNova |
| <a href="tel:(919)%20460-3330" value="+19194603330" style="color:rgb(17,85,204)" target="_blank">919-460-3330 (opt 1) • mark.haney@... www.neonova.net |
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Well, I'm getting closer, though now the log is entered twice in syslog. Which, I'm not at all certain as to why that would be. This has cut way down on these entries being created, but can still screw up the reporting for the customer's web reporting tool. I'm still unsure why the ACK message type is being ignored.
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On Tue, May 30, 2017 at 12:05:53PM -0400, Bob Harold wrote:
> On Tue, May 30, 2017 at 8:02 AM, Mark Haney < [hidden email]> 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.
How many relay agents do you have?
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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:
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