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Chapter 21 Remote Management
ZyWALL 2 Plus User’s Guide
371
SNMP itself is a simple request/response protocol based on the manager/agent model. The
manager issues a request and the agent returns responses using the following protocol
operations:
• Get - Allows the manager to retrieve an object variable from the agent.
• GetNext - Allows the manager to retrieve the next object variable from a table or list
within an agent. In SNMPv1, when a manager wants to retrieve all elements of a table
from an agent, it initiates a Get operation, followed by a series of GetNext operations.
• Set - Allows the manager to set values for object variables within an agent.
• Trap - Used by the agent to inform the manager of some events.
21.14.1 Supported MIBs
The ZyWALL supports MIB II that is defined in RFC-1213 and RFC-1215. The focus of the
MIBs is to let administrators collect statistical data and monitor status and performance.
21.14.2 SNMP Traps
The ZyWALL will send traps to the SNMP manager when any one of the following events
occurs:
21.14.3 REMOTE MANAGEMENT: SNMP
To change your ZyWALL’s SNMP settings, click ADVANCED > REMOTE MGMT >
SNMP. The screen appears as shown.
Table 122 SNMP Traps
TRAP # TRAP NAME DESCRIPTION
0 coldStart (defined in RFC-1215) A trap is sent after booting (power on).
1 warmStart (defined in RFC-
1215)
A trap is sent after booting (software reboot).
4 authenticationFailure (defined in
RFC-1215)
A trap is sent to the manager when receiving any SNMP
get or set requirements with the wrong community
(password).
6 whyReboot (defined in ZYXEL-
MIB)
A trap is sent with the reason of restart before rebooting
when the system is going to restart (warm start).
6a For intentional reboot : A trap is sent with the message "System reboot by user!"
if reboot is done intentionally, (for example, download
new files, CI command "sys reboot", etc.).
6b For fatal error : A trap is sent with the message of the fatal code if the
system reboots because of fatal errors.