Graphing DHCP pools

Thu Dec 21 20:36:57 UTC 2017

Yes x2. I have the appropriate line in /etc/snmp/snmpd.conf:

pass_persist .1.3.6.1.4.1.21695.1.2 /home/nagios/dhcpd-snmp
/home/nagios/dhcpd-snmp.conf

And I am able to poll other OID's remotely.

root 02:29:38 0 jobs ~ > snmpwalk -v2c -On <host> -c public
.1.3.6.1.2.1.1.1.0 = STRING: Linux <host> 2.6.32-696.13.2.el6.x86_64 #1 SMP
Fri Sep 22 12:32:14 EDT 2017 x86_64
.1.3.6.1.2.1.1.2.0 = OID: .1.3.6.1.4.1.8072.3.2.10
.1.3.6.1.2.1.1.3.0 = Timeticks: (123002397) 14 days, 5:40:23.97
.1.3.6.1.2.1.1.4.0 = STRING: Root <root at localhost> (configure
/etc/snmp/snmp.local.conf)
.1.3.6.1.2.1.1.5.0 = STRING: localhost
.1.3.6.1.2.1.1.6.0 = STRING: Unknown (edit /etc/snmp/snmpd.conf)
.1.3.6.1.2.1.1.8.0 = Timeticks: (2) 0:00:00.02
.1.3.6.1.2.1.1.9.1.2.1 = OID: .1.3.6.1.6.3.11.2.3.1.1
.1.3.6.1.2.1.1.9.1.2.2 = OID: .1.3.6.1.6.3.15.2.1.1
.1.3.6.1.2.1.1.9.1.2.3 = OID: .1.3.6.1.6.3.10.3.1.1
.1.3.6.1.2.1.1.9.1.2.4 = OID: .1.3.6.1.6.3.1
.1.3.6.1.2.1.1.9.1.2.5 = OID: .1.3.6.1.2.1.49
.1.3.6.1.2.1.1.9.1.2.6 = OID: .1.3.6.1.2.1.4
.1.3.6.1.2.1.1.9.1.2.7 = OID: .1.3.6.1.2.1.50
.1.3.6.1.2.1.1.9.1.2.8 = OID: .1.3.6.1.6.3.16.2.2.1
.1.3.6.1.2.1.1.9.1.3.1 = STRING: The MIB for Message Processing and
Dispatching.
.1.3.6.1.2.1.1.9.1.3.2 = STRING: The MIB for Message Processing and
Dispatching.
.1.3.6.1.2.1.1.9.1.3.3 = STRING: The SNMP Management Architecture MIB.
.1.3.6.1.2.1.1.9.1.3.4 = STRING: The MIB module for SNMPv2 entities
.1.3.6.1.2.1.1.9.1.3.5 = STRING: The MIB module for managing TCP
implementations
.1.3.6.1.2.1.1.9.1.3.6 = STRING: The MIB module for managing IP and ICMP
implementations
.1.3.6.1.2.1.1.9.1.3.7 = STRING: The MIB module for managing UDP
implementations
.1.3.6.1.2.1.1.9.1.3.8 = STRING: View-based Access Control Model for SNMP.
.1.3.6.1.2.1.1.9.1.4.1 = Timeticks: (2) 0:00:00.02
.1.3.6.1.2.1.1.9.1.4.2 = Timeticks: (2) 0:00:00.02
.1.3.6.1.2.1.1.9.1.4.3 = Timeticks: (2) 0:00:00.02
.1.3.6.1.2.1.1.9.1.4.4 = Timeticks: (2) 0:00:00.02
.1.3.6.1.2.1.1.9.1.4.5 = Timeticks: (2) 0:00:00.02
.1.3.6.1.2.1.1.9.1.4.6 = Timeticks: (2) 0:00:00.02
.1.3.6.1.2.1.1.9.1.4.7 = Timeticks: (2) 0:00:00.02
.1.3.6.1.2.1.1.9.1.4.8 = Timeticks: (2) 0:00:00.02
.1.3.6.1.2.1.25.1.1.0 = Timeticks: (574473501) 66 days, 11:45:35.01
.1.3.6.1.2.1.25.1.1.0 = No more variables left in this MIB View (It is past
the end of the MIB tree)

root 02:31:25 0 jobs ~ > snmpget -v2c -On -c public <host>
.1.3.6.1.2.1.1.5.0
.1.3.6.1.2.1.1.5.0 = STRING: localhost

When I try to poll the OID listed in snmpd.conf from the "pass_persists"
line, it fails.

root 02:33:53 0 jobs ~ > snmpget -v2c -On -c public <host>
.1.3.6.1.4.1.21695.1.2
.1.3.6.1.4.1.21695.1.2 = No Such Object available on this agent at this OID

What am I missing?

On Thu, Dec 21, 2017 at 1:06 PM, David Ramage <dramage at lsnetworks.net>
wrote:

> That dhcpd-snmp.conf looks good to me, so I’m afraid I have to ask you a
> couple of other questions.
>
>
>
> Are you able to poll any OIDs from your server at all?
>
>
>
> If you are, do you have the pass-through MIB extension in your sntmpd.conf?
>
>
>
>
>
>
>
> *From:* dhcp-users [mailto:dhcp-users-bounces at lists.isc.org] *On Behalf
> Of *project722
> *Sent:* Thursday, December 21, 2017 10:51 AM
> *To:* Users of ISC DHCP <dhcp-users at lists.isc.org>
> *Subject:* Re: Graphing DHCP pools
>
>
>
> @David Rampage - I am still wrestling with that error when poling
> externally. Here is my dhcpd-snmp.conf file structure, as you requested.
>
>
>
> # Configuration file for dhcpd-snmp
>
>
>
> # Path to the dhcpd.leases file.
>
> #
>
> # leases: /var/lib/dhcp3/dhcpd.leases
>
>
>
> leases: /var/lib/dhcpd/dhcpd.leases
>
>
>
> # Definition of the pools
>
> #
>
> # pool: number, description, from-to, from-to, from-to...
>
>
>
> pool: 1, "Market 1", 192.168.100.100 192.168.100.254 192.168.101.100
> 192.168.101.254
>
>
>
> pool: 2, "Market 2", 192.168.200.100 192.168.200.254 192.168.201.100
> 192.168.201.254
>
>
>
> pool: 3, "Market 3", 192.168.202.100 192.168.202.254 192.168.203.100
> 192.168.203.254
>
>
>
>
>
> Just to recap, I can run the dhcpd-snmp script locally, and it works. But
> if I try an smnpwalk from a remote device, I get the following error:
>
>
>
> #snmpwalk -v 2c <host> -c public .1.3.6.1.4.1.21695.1.2
>
> SNMPv2-SMI::enterprises.21695.1.2 = No more variables left in this MIB
> View (It is past the end of the MIB tree)
>
>
>
> Do I need to place some dhcpd-snmp specific MIB's somewhere on the server?
>
>
>
>
>
> On Thu, Dec 7, 2017 at 3:34 PM, Simon Hobson <dhcp1 at thehobsons.co.uk>
> wrote:
>
> project722 <project722 at gmail.com> wrote:
>
> > I'm going to look into Cacti, as we will probably not deem this high
> enough on the priority list to purchase Solarwinds. But, for the moment, I
> have setup dhcpd-snmp on my DHCP server.
>
> Just a thought ...
> Cacti doesn't HAVE to use SNMP, you can supply your own data externally.
> So you could use any means of extracting the pool status and insert that
> into RRD files, and let Cacti handle the graphing. Obviously it starts
> getting more complicated if the DHCP and Cacti servers are on different
> hosts.
>
>
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>
>
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