Reactive monitoring starts with checking the availability and the response time of vital services such as
RADIUS, and others. NetCrunch does more than checking if the port is open or the connection is established - it verifies the service response to make sure the service is responding correctly.
SNMP protocol is the essential protocol used for monitoring state and performance data of various devices. Even that SNMP is now almost 30 years old it still an indispensable part of the monitoring landscape. It is lightweight and straightforward to implement especially on the agent side so that you can find it many devices such as switches, printers, UPS, firewall, and others.
This is the most basic monitoring type in NetCrunch. A node state is determined basically by the availability of network services. When a node is in the DOWN state, it's only monitored by a single network service we call
NetCrunch automatically discovers services on each machine and starts monitoring them. Each check usually requires sending multiple packets, so that program can calculate packet loss rate and make sure the service is responding even it drops some responses.
NetCrunch supports over 70 protocols including all secure version of protocols such as HTTP/S, FTPS, POP3/S, etc.
You can easily duplicate service definition and make a new one with the different port definition. For example, you can change the port and save the HTTP service as "HTTP 8080".
All network service checks are available in
Remote Probe - a lightweight probe that can be installed on a tiny Windows device. You can use it in a similar way to Cisco IPSLA but to check remote connections and service quality.
Please refer to Distributed Monitoring for more information.
NetCrunch delivers a pre-compiled MIB library containing overt 8500 MIBs including Cisco, Nortel, 3Com, Alcatel, and hundreds of the others.
We grouped modules by vendors, and you can see that some MIB group like Cisco group contains a massive number of a compiled modules (over 1000).
SNMP protocol describes only variables, tables, and basic operations, SNMP tables often refer to other tables to lookup for column values, so it makes reading data not that easy.
NetCrunch SNMP Views can present data in a clean human-readable form. Additionally, views allow changing SNMP values so they can create UI for SNMP device.
NetCrunch provides many ready to use view definitions for popular devices such as switches, routers or servers. The program also allows creating custom views that can be automatically recognized by the device type and displayed correctly for the device.
Managing node settings is very easy. All you need is to add an element to be monitored to
SNMP Trap or
The easiest way of managing SNMP settings is using Monitoring Packs.
To monitor SNMP on a particular node, you need to enable SNMP monitor and set its profile and port settings otherwise it will use the default one.
You can quickly set alerts on numerical values using one of many threshold types available in NetCrunch.
The process is very straightforward, click on
Custom and add a
<Alert on Performance Trigger>.
Then you will be able to select SNMP variable as a performance counter. You can find an OID in the MIB library, or you can use OID if you have one.
You can also monitor text values returned by the SNMP agent. In order to this, you have to select
<New Event for SNMP Variable Value> alert type.
NetCrunch allows executing
Set SNMP Variable action as the alerting action. Additionally, NetCrunch can forward all received traps to another SNMP manager making device configuration easier.
NetCrunch receives SNMP traps by default, even from nodes not in the Atlas. All you need to configure the device to send it to NetCrunch.
Turning received traps from External Events windows into alerts is easy, the program will create a node if it is not defined in the Atlas yet. This process simply creates the alert by trap OID. You can also define more complex alerts by filtering certain trap variables.
SNMP v3 protocol uses a different model for notifications than earlier SNMP versions. You need to define a proper authentication profile first since they have to be decoded using a password and valid encryption settings.
Read more in Receiving SNMPv3 Notifications
As the switches are a vital part of your network monitoring of their performance is unquestionable. Monitoring of switch interfaces allows bandwidth monitoring.
On the picture above you can see Monitoring Packs added automatically to switch device.
You can control of interface monitoring by the policy. By default, NetCrunch monitors all active interfaces. You can create own policy and monitor only selected interfaces.
NetCrunch presents traffic on all interfaces.
Additionaly NetCrunch provides Layer-2 topology mapping with additional module Layer 2 Topology Mapping
NetCrunch allows monitoring state of Cisco IPSLA operations. You can select operations previously defined on a Cisco device. Operations are grouped by protocol type. You can set easily alerts status or metrics,
Read more in documentation Cisco IP SLA Operations
NetCrunch offers two tools to monitors printers. Both of them use SNMP protocols and require Printer MIB v2 to be supported by your printer.
It allows monitoring levels of toner or ink cartridge.
It allows monitoring much more than checking supplies level. The sensor supports printer status objects and can observe alarms triggered by the printer.
NetCrunch contains iTools network diagnostic tools. They contain two tools for SNMP - a MIB browser and SNMP Info View. These tools use the same profile as defined in NetCrunch.
You can also get free NetCrunch Tools which contain SNMP scanner supporting SNMP v3.
Types of SNMP devices include switches, bridges, routers, access servers, computer hosts, servers, ups, printers, IP cameras and even automation devices can be controlled thanks to SNMP gateways. These are devices that are part of your SNMP network and relay relevant information via SNMP about the status of various services.
Making your infrastructure with devices from a single vendor is hard. NetCrunch supports multiple vendors out of the box such as Cisco, HP, Huawei, Juniper, Dell, Alcatel, Arista and many others.
NetCrunch provides support for over 460 hardware manufactures - you do not have to look for MIBs all are in the NetCrunch database.
Read more in documentation chapter Monitoring SNMP Devices