SNMP is the main protocol for monitoring network hardware which may be used in Zabbix — an all-in-one solution for monitoring a large number of objects in static changing slowly networks. In order to protect sensitive data, SNMPv3 should be enabled.
SNMP is the main protocol for monitoring network hardware used to monitor network devices and to manage them by sending simple commands for example, to reboot a device, to enable or disable network interfaces, etc. The main difference between SNMPv3 and the previous versions — the classic security functions [] :. SNMPv3 allows using security models where different users and user groups have an authentication strategy assigned to them while, in a request from a server to a monitored device, the previous versions of SNMP only checked the community string, which was transmitted as plain text and served as a password.
The combination of a security model and a specific level determines which security mechanism will be used to process an SNMP data packet [4].
It is preferable to use AES. Windows-specific item keys. User macros. IT services. Web monitoring. Virtual machine monitoring. Virtual machine discovery key fields. Regular expressions. Event acknowledgement. Configuring a network discovery rule. Notes on low-level discovery. Distributed monitoring. Web interface. Method reference. API info.
Discovered host. Discovered service. Discovery check. Discovery rule. Graph item. Graph prototype. Host group. Host interface. Host prototype. Icon map. Item prototype. IT service. LLD rule. Discovery rule. Graph item. Graph prototype. Host group. Host interface. Host prototype. Icon map. Item prototype. LLD rule. Media type. Screen item. Template screen. Template screen item. Trigger prototype. User group.
User macro. Value map. According to RFC section 3. Some devices do not do that, which results in their SNMP messages being discarded as outdated after being restarted. To get a list of SNMP strings, use the snmpwalk command part of net-snmp software which you should have installed as part of the Zabbix installation or equivalent tool:.
This should give you a list of SNMP strings and their last value. If it doesn't then it is possible that the SNMP 'community' is different from the standard 'public' in which case you will need to find out what it is. You can then go through the list until you find the string you want to monitor, e.
Note that the last number in the string is the port number you are looking to monitor. See also: Dynamic indexes. Create a host corresponding to a device. In cases, where Security name is also changed, all parameters will be updated immediately. However, the template may not be compatible with the host. Click on Add to save the host. Depending on whether you used a template or not when creating your host, you will have either a list of SNMP items associated with your host or just an empty list.
We will work on the assumption that you are going to create the item yourself using the information you have just gathered using snmpwalk and snmpget, so click on Create item. In the new item form:. Note that OID can be given in either numeric or string form. However, in some cases, string OID must be converted to numeric representation. Utility snmpget may be used for this purpose:.
Monitoring of SNMP parameters is possible if --with-net-snmp flag was specified while configuring Zabbix sources. Starting from 2. This affects several types of SNMP items:. All SNMP items on a single interface with identical parameters are scheduled to be queried at the same time. The first two types of items are taken by pollers in batches of at most items, whereas low-level discovery rules are processed individually, as before.
On the lower level, there are two kinds of operations performed for querying values: getting multiple specified objects and walking an OID tree. However, there is a technical issue that not all devices are capable of returning values per request. Some always return a proper response, but others either respond with a "tooBig 1 " error or do not respond at all once the potential response is over a certain limit.
In order to find an optimal number of objects to query for a given device, Zabbix uses the following strategy. It starts cautiously with querying 1 value in a request. If that is successful, it queries 2 values in a request.
0コメント