Standard values of the community strings:
● public
has only read permissions
● private
has read and write permissions
Note
Because the SNMP community strings are used for access protection, do not use the
standard values "public" or "private". Change these values following the initial
commissioning.
Further simple protection mechanisms at the device level:
● Allowed Host
The IP addresses of the monitoring systems are known to the monitored system.
● Read Only
If you assign "Read Only" to a monitored device, monitoring stations can only read out data
but cannot modify it.
SNMP data packets are not encrypted and can easily be read by others.
The central station is also known as the management station. An SNMP agent is installed on
the devices to be monitored with which the management station exchanges data.
The management station sends data packets of the following type:
● GET
Request for a data record from the SNMP agent
● GETNEXT
Calls up the next data record.
● GETBULK (available as of SNMPv2c)
Requests multiple data records at one time, for example several rows of a table.
● SET
Contains parameter assignment data for the relevant device.
The SNMP agent sends data packets of the following type:
● RESPONSE
The SNMP agent returns the data requested by the manager.
● TRAP
If a certain event occurs, the SNMP agent itself sends traps.
SNMPv1/v2c/v3 use UDP (User Datagram Protocol) and use the UDP ports 161 and 162. The
data is described in a Management Information Base (MIB).
SNMPv3
Compared with the previous versions SNMPv1 and SNMPv2c, SNMPv3 introduces an
extensive security concept.
Technical basics
4.6 SNMP
SCALANCE W1780/W1740 according to IEEE 802.11ac Web Based Management
Configuration Manual, 11/2019, C79000-G8976-C485-03 39
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