---
title: "SNMP monitoring - icom OS Routers"
slug: "snmp-monitoring-en"
updated: 2025-01-08T09:53:47Z
published: 2025-01-08T09:53:47Z
canonical: "docs.insys-icom.com/snmp-monitoring-en"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.insys-icom.com/llms.txt
> Use this file to discover all available pages before exploring further.

# SNMP monitoring - icom OS Routers

SNMP (Simple Network Management Protocol) is a network protocol for monitoring and control of network elements, such as routers, servers, switches, computers, etc., from a central station.

You’ll find an example for monitoring of various router values via SNMP in the following. The tool used to simulate the central station is just an example. This can be used as an example for the configuration of the software actually used.

## Situation

Router values are to be read using SNMP.

## Solution

An SNMP agent will be activated and configured on the router, which responds to SNMP Get requests received from the central station. The values and parameters are contained as objects in the MIB (Management Information Base). The MIB will be downloaded from the router and imported into the software of the central station. Ensure that you have access to the web interface of the router.

### Activating the SNMP agent and downloading the MIB

1. Open the user interface of the router: https://insys.icom
2. Click in the *Events* → *SNMP Agent* menu on in the row of the SNMP agent and configure it accordingly:

  - *Active*:
  - *Port*: 161 (default)
  - *Use SNMP v1/v2c*:
  - *Community*: enter an individual Community String (**commstring** is just an example here) ![cg en m3 snmp monitoring v2 01](https://docs.insys-icom.de/assets/cg_en_m3_snmp_monitoring_v2_01.png)

1. Click on SUBMIT.
2. Click on *Private SNMP-MIB* and download it.
3. Click on ACTIVATE PROFILE .

> [!NOTE]
> Please note!
> 
> Since the free available MIB browser used for this example only supports the SNMP v2 protocol, this is used here. It is recommended to use the SNMP v3 protocol with authentication and encryption using sufficiently strong passwords or protect the SNMP communication using a VPN tunnel for productivity use.

### Creating a Firewall rule

If a Firewall is enabled on the router, an exception rule must be created that permits SNMP Get requests.

1. Click in the *Network* → *Firewall / NAT* menu in the *IP-Filter* section on and add a new firewall rule:

  - *Description*: Access to SNMP agent
  - *Packet direction*: INPUT
  - *IP version*: select used IP version
  - *Protocol*: UDP
  - *Input interface*: check all interfaces over which the SNMP agent is to be accessed
  - *Destination port*: above configured UDP port (default 161) ![cg en m3 snmp monitoring v2 02](https://docs.insys-icom.de/assets/cg_en_m3_snmp_monitoring_v2_02.png)
2. Click on SUBMIT.
3. Click on ACTIVATE PROFILE .

### Retrieving the SNMP objects by the central station

The **iReasoning MIB Browser** is used in this Configuration Guide for retrieving the values from the router. The software of your central station will differ from this and must be configured individually using this as an example.

1. Download the [iReasoning MIB Browser](https://www.ireasoning.com/mibbrowser.shtml) and install it.
2. Start the **MIB Browser**.
3. Select *File* → *UnLoad MIBs* in the menu and delete the standard MIBs for reasons of clarity.
4. Select *File* → *Load MIBs* in the menu and load the MIB downloaded from the router above.
5. Enter the IP address of the router in the *Address* field (default: **192.168.1.1**), click on *Advanced…​* and configure the properties of the SNMP agent:

  - *Port*: above configured UDP port (default 161)
  - *Read Community*: above configured Community String
  - *Write Community*: above configured Community String
  - *SNMP Version*: 2
6. Click on *OK*. ![cg m3 snmp monitoring mib 01](https://docs.insys-icom.de/assets/cg_m3_snmp_monitoring_mib_01.png)
7. Highlight the desired value in the *MIB Tree* and select **Get** under *Operations* (no further click on *Go* is necessary following a change under *Operations*). ![cg m3 snmp monitoring mib 02](https://docs.insys-icom.de/assets/cg_m3_snmp_monitoring_mib_02.png) In this example, the *Value* column of the result table returns the value of input 1 - **low**, i.e. open.
8. Highlight another value and click on *Go*.

## Troubleshooting

You may disable the netfilters in the *Netfilter* → *IP filter* menu temporarily to find out, whether wrong filter settings are the reason for access issues.

Standard IP address: https://192.168.1.1; login depending on configuration; default for earlier firmware versions: *User name*: **insys**, *Password*: **icom**