Cant pull dhcp snmp tables

Telegraf
1

hello community

im trying to pull tables via telegraf snmp.input with no success.
when executing snmptable command i getting an error.
even when trying to pull the table fields separately I get no data.
all OIDs work fine using snmpwalk.
all MIBs are loaded.
on the other hand, pulling IF tables I have no issue.
im having the same issue with another table as well (lldp remote).
im using telegraf 1.22.1 on ubuntu 18.04.
attached below are the configuration and the commands outputs and part of the MIB reference.

appreciate any tip or advice on how to proceed from here.
best regards

dhcpoid
dhcpoid753×839 94.5 KB

config

 [[inputs.snmp.table]]
    oid = ".1.3.6.1.4.1.1625.2.3.2.3.1"
    name = "subtable"
    inherit_tags = ["hostname"]
    index_as_tag = true
     [[inputs.snmp.table.field]]
       name = "subname"
       oid = ".1.3.6.1.4.1.1625.2.3.2.3.1.2"
       is_tag = true
     [[inputs.snmp.table.field]]
       name = "subuse"
       oid = ".1.3.6.1.4.1.1625.2.3.2.3.1.8"
       is_tag = true

snmptable output

snmptable -v2c -c younity 172.17.109.2 NSW-DHCP-MIB::nswDHCPSubnetEntry
Was that a table? NSW-DHCP-MIB::nswDHCPSubnetEntry

snmpwalk ouput (parts of it)

root@t-building-exporter:~# snmpwalk -v2c -c younity 172.17.109.2 .1.3.6.1.4.1.1625.2.3.2.3.1 | more
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.2.1 = STRING: "172.17.109.0"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.2.2 = STRING: "172.18.132.0"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.2.3 = STRING: "10.0.88.0"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.2.4 = STRING: "10.1.0.0"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.2.5 = STRING: "10.11.1.0"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.2.6 = STRING: "10.11.2.0"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.2.7 = STRING: "10.11.3.0"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.2.8 = STRING: "10.11.4.0"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.2.9 = STRING: "10.11.5.0"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.1 = STRING: "Added automatically to match listening network interface"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.2 = STRING: "access vlan 2"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.3 = STRING: "Created by Infinity IPAM : guests - guests"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.4 = STRING: "Created by Infinity IPAM : staff - staff"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.5 = STRING: "Created by Infinity IPAM : V1101 - Cust"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.6 = STRING: "Created by Infinity IPAM : V1102 - Cust"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.7 = STRING: "Created by Infinity IPAM : V1103 - Cust"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.8 = STRING: "Created by Infinity IPAM : V1104 - Cust"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.9 = STRING: "Created by Infinity IPAM : V1105 - Cust"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.3.10 = STRING: "Created by Infinity IPAM : V1106 - Cust"
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.8.1 = Gauge32: 9
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.8.2 = Gauge32: 284
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.8.3 = Gauge32: 153
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.8.4 = Gauge32: 0
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.8.5 = Gauge32: 1
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.8.6 = Gauge32: 1
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.8.7 = Gauge32: 3
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.8.8 = Gauge32: 1
SNMPv2-SMI::enterprises.1625.2.3.2.3.1.8.9 = Gauge32: 1

snmpwalk using OID name

root@t-building-exporter:~# snmpwalk -v2c -c younity 172.17.109.2 NSW-DHCP-MIB::nswDHCPSubnetEntry | more
NSW-DHCP-MIB::nswDHCPSubnetName.1 = STRING: 172.17.109.0
NSW-DHCP-MIB::nswDHCPSubnetName.2 = STRING: 172.18.132.0
NSW-DHCP-MIB::nswDHCPSubnetName.3 = STRING: 10.0.88.0
NSW-DHCP-MIB::nswDHCPSubnetName.4 = STRING: 10.1.0.0
NSW-DHCP-MIB::nswDHCPSubnetName.5 = STRING: 10.11.1.0
NSW-DHCP-MIB::nswDHCPSubnetName.6 = STRING: 10.11.2.0
NSW-DHCP-MIB::nswDHCPSubnetName.7 = STRING: 10.11.3.0
NSW-DHCP-MIB::nswDHCPSubnetName.8 = STRING: 10.11.4.0
NSW-DHCP-MIB::nswDHCPSubnetName.9 = STRING: 10.11.5.0
NSW-DHCP-MIB::nswDHCPSubnetName.10 = STRING: 10.11.6.0
NSW-DHCP-MIB::nswDHCPSubnetDescription.1 = STRING: Added automatically to match listening network interface
NSW-DHCP-MIB::nswDHCPSubnetDescription.2 = STRING: access vlan 2
NSW-DHCP-MIB::nswDHCPSubnetDescription.3 = STRING: Created by Infinity IPAM : guests - guests
NSW-DHCP-MIB::nswDHCPSubnetDescription.4 = STRING: Created by Infinity IPAM : staff - staff
NSW-DHCP-MIB::nswDHCPSubnetDescription.5 = STRING: Created by Infinity IPAM : V1101 - Cust
NSW-DHCP-MIB::nswDHCPSubnetDescription.6 = STRING: Created by Infinity IPAM : V1102 - Cust
NSW-DHCP-MIB::nswDHCPSubnetDescription.7 = STRING: Created by Infinity IPAM : V1103 - Cust
NSW-DHCP-MIB::nswDHCPSubnetDescription.8 = STRING: Created by Infinity IPAM : V1104 - Cust
NSW-DHCP-MIB::nswDHCPSubnetDescription.9 = STRING: Created by Infinity IPAM : V1105 - Cust
NSW-DHCP-MIB::nswDHCPSubnetDescription.10 = STRING: Created by Infinity IPAM : V1106 - Cust
NSW-DHCP-MIB::nswDHCPSubnetDescription.11 = STRING: Created by Infinity IPAM : V1107 - Cust
NSW-DHCP-MIB::nswDHCPSubnetDynamicAddressesUsed.1 = Gauge32: 9
NSW-DHCP-MIB::nswDHCPSubnetDynamicAddressesUsed.2 = Gauge32: 284
NSW-DHCP-MIB::nswDHCPSubnetDynamicAddressesUsed.3 = Gauge32: 153
NSW-DHCP-MIB::nswDHCPSubnetDynamicAddressesUsed.4 = Gauge32: 0
NSW-DHCP-MIB::nswDHCPSubnetDynamicAddressesUsed.5 = Gauge32: 1
NSW-DHCP-MIB::nswDHCPSubnetDynamicAddressesUsed.6 = Gauge32: 1
NSW-DHCP-MIB::nswDHCPSubnetDynamicAddressesUsed.7 = Gauge32: 3

snmptranslate

~# snmptranslate .1.3.6.1.4.1.1625.2.3.2.3.1
SNMPv2-SMI::enterprises.1625.2.3.2.3.1
2

same when trying to pull lldp table

3

Both snmptable and inputs.snmp.table expect a table OID, while you are specifying the entry OID, which is one octet deeper in the hierarchy (an SNMP table is a sequence of entries).

snmpwalk is able to handle this because it just asks the agent for the successor to the OID you specify, and then successor to that OID, until that portion of the hierarchy is exhausted.

Try using NSW-DHCP-MIB::nswDHCPSubnetTable (.1.3.6.1.4.1.1625.2.3.2.3) in both places instead.

1 Like
4

that did the trick!!
such a simple solution :wink:
thank you