Chapter 21 Remote Management

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.

21.14.1Supported 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:

Table 124

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-

A trap is sent after booting (software reboot).

 

 

1215)

 

 

 

 

 

4

 

authenticationFailure (defined in

A trap is sent to the manager when receiving any SNMP

 

 

RFC-1215)

get or set requirements with the wrong community

 

 

 

(password).

 

 

 

 

6

 

whyReboot (defined in ZYXEL-

A trap is sent with the reason of restart before rebooting

 

 

MIB)

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.

 

 

 

 

21.14.3 REMOTE MANAGEMENT: SNMP

To change your ZyWALL’s SNMP settings, click ADVANCED > REMOTE MGMT > SNMP. The screen appears as shown.

 

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ZyWALL 2 Plus User’s Guide