Extract item value from strings (snmpwalk)

[RobinH]

Hello!

I am trying to extract values from a router's LAN interface and which devices are connected.
I have then tried to find different ways to do it with SNMP and what I find that does it is an snmpwalk and created an item that collects the values, but they come as several longer strings and it is only the part that contains the IP address that I am interested in.
The number of devices may vary and the IP-adresses may also change because of DHCP.

Result:
.1.3.6.1.4.1.39699.123.3.2.2.2.1.2.1 = STRING: "10.0.89.100"
.1.3.6.1.4.1.39699.123.3.2.2.2.1.2.2 = STRING: "10.0.89.149"

Anyone who knows and knows how to proceed to clear everything except the IP address?

[Hamardaban]

I think it needs to be done using preprocessing
The problem is that you have data on several lines - you can't process it just like
that with regex, but there is an "SNMP walk to JSON" that will turn your strings into json - and then a direct path to its processing.
You can pull out the necessary data in JS.
What exactly do you want to do next - i dont know.

[RobinH]

Thank you for the reply!

I created a SNMP walk to JSON and get this instead now:

[{"{#SNMPINDEX}":"2","{#IFDESCR}":"10.0.89.149"},{" {#SNMPINDEX}":"1","{#IFDESCR}":"10.0.89.100"}]

Is it possible from this kind of string?

[SanMonitor]

Thank you for the reply!

I created a SNMP walk to JSON and get this instead now:

[{"{#SNMPINDEX}":"2","{#IFDESCR}":"10.0.89.149"} ,{" {#SNMPINDEX}":"1","{#IFDESCR}":"10.0.89.100"}]

Is it possible from this kind of string?

Hey Robin,
since you have multiple IP's in your JSON, you'll have to use a discovery rule to create an item for each IP.
Here the Zabbix documentation 4 Discovery of SNMP OIDs (zabbix.com) to set this up.

[RobinH]

Hey, thank you for the reply!

I have created a discovery rule that makes it look like this (I have added the MAC-adresses):

[{"{#SNMPINDEX}":"1","{#IFDESCR}":"D8:EC:E5:C0:4 3:C 6","{#IFTYPE}":"10.0.89.100"},{"{#SNMPINDEX}":" 2", "{#IFDESCR}":"00:90:E8:60:15:38","{#IFTYPE}":" 10.0 .89.149"}]

What do I do next?
Im very new to Zabbix.

[RobinH]

I have created Item prorotypes which looks like they work but in the item lists the collected values have the status "Not supported".
But Zabbix has found all of them and created items?

[Hamardaban]

I created a SNMP walk to JSON and get this instead now:

[{"{#SNMPINDEX}":"2","{#IFDESCR}":"10.0.89.149"} ,{" {#SNMPINDEX}":"1","{#IFDESCR}":"10.0.89.100"}]

Is it possible from this kind of string?

Make JS priprocessing step with code

var inrow_string = ''
var separator = ' '
var val_obj = JSON.parse(value);  
inrow_string = val_obj.reduce(function(accumulator, currentValue) {
  return accumulator["{#IFDESCR}"] + separator + currentValue["{#IFDESCR}"]
});
return inrow_string;​

[RobinH]

It doesnt seem to work.
Zabbix return "SyntaxError: invalid token (line 7)" when I test it

[Hamardaban]

Zabbix 6.4.2 - its work!

OPT1:



OR OPT2:




The same result:

[RobinH]

Hey, thank you!
It worked when erased the first line