Microplex M204 Spezifikationen PDF herunterladen (Seite 139)

USING THE M204’S ADDITIONAL OPTIONS: Managing With SNMP 131

destinations, logpaths, and users.

status group All dynamic monitoring components such as

print queues, user logins, and RPRINTER con-

ﬁgurations.

command group This includes the commands save, load, and

reset.

These variables can have read, write, or read-

write permissions. Along with these permissions

there are other elements that can limit the write

access to these variables. Please see SNMP Secu-

rity on page 131 and User Accounts and Permis-

sions on page 82 for more information.

Custom MIB Traps

A trap is an event generated by an agent to indicate a signiﬁcant event to the manager.

The M204 continuously generates three traps:

coldstart A generic trap generated every time the M204 is

powered on or reset

authenticationFailure A generic trap generated whenever a disallowed

access is attempted

lpqIOStatusChanged The only custom trap. This trap is generated

whenever an I/O port’s status changes.

No trap is generated on a CTS change on the

serial ports. Only DCD changes will trigger this.

SNMP Security

SNMP does not include any formal type of security deﬁnition. However, security can

be accomplished using communities. A community is a string that is sent with every

SNMP request and is used to deﬁne a certain view of the MIB. By doing this, you can

control what parts of the MIB are accessed by SNMP managers.

To access the M204’s custom MIB, the public community string can be used to read

any variable that have read access. To restrict write access, there is an additional

security step implemented. This involves deﬁning a user named snmp on the M204

with root privileges. The password deﬁned for this snmp user will then be used as the

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Microplex M204 Spezifikationen Seite 139