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Sidewinder G2 6.1.1 Administration Guide - Glossary of Technical ...

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Figure 14-2. Community<br />

name within an SNMP<br />

message<br />

SNMP and <strong>Sidewinder</strong> <strong>G2</strong><br />

Each managed node can send an unsolicited event notification<br />

message, called a trap, to a management station when it detects<br />

certain system events. For example, you can configure the SNMP<br />

agent in the <strong>Sidewinder</strong> <strong>G2</strong> to issue a trap whenever an unauthorized<br />

user tries to read, write, or execute a protected file on the <strong>Sidewinder</strong><br />

<strong>G2</strong>. (Refer to “<strong>Sidewinder</strong> <strong>G2</strong> SNMP traps” on page 14-4” for a list <strong>of</strong><br />

all traps supported by the <strong>Sidewinder</strong> <strong>G2</strong>.)<br />

When setting up SNMP management, a network administrator assigns<br />

the management station and the nodes it will manage a community<br />

name. As shown in Figure 14-2, the community name is in the<br />

authentication header in each SNMP message exchanged between a<br />

management station and a managed node.<br />

VERSION<br />

COMMUNITY<br />

NAME<br />

SNMP COMMAND: GET, GETNEXTREQUEST, ETC.<br />

The SNMP agent treats the community name like a password to<br />

validate the identity <strong>of</strong> a management station. For example, suppose a<br />

management station sends a get request to retrieve information from<br />

a managed node’s SNMP agent. If the community name within the<br />

get request is not also used by the SNMP agent, the agent will not<br />

return information to the management station.<br />

Caution: To increase security on your network, DO NOT use common default names<br />

such as "public" or "private," which can be easily guessed.<br />

Both the management station and the managed node also contain<br />

Management Information Bases (MIBs) that store information about<br />

the managed objects. Currently, the SNMP agent on the <strong>Sidewinder</strong><br />

<strong>G2</strong> supports standard MIB II objects, the Host Resources MIB<br />

(RFC1514), and the <strong>Sidewinder</strong> <strong>G2</strong>-specific MIB objects. MIBs are<br />

discussed in greater detail later in this chapter.<br />

Note: The MIBs used for compiling the SNMP agent for the <strong>Sidewinder</strong> <strong>G2</strong> are located in<br />

/etc/sidewinder/snmp.<br />

If you need more information on SNMP, an excellent source is<br />

Managing Internetworks with SNMP by Mark A. Miller, P.E. (M&T<br />

Books).<br />

Configuring the SNMP Agent 14-3

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