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Understanding the network.pdf - Back to Home

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sysLocation information, go <strong>to</strong> <strong>the</strong> Control menu and select Set Location…. Here,<br />

enter <strong>the</strong> system location information and a telephone number for <strong>the</strong> technical<br />

contact.<br />

The Macin<strong>to</strong>sh SNMP client provides several SNMP agents <strong>to</strong> collect management<br />

information. To see <strong>the</strong> SNMP agents available <strong>to</strong> a given community name, select<br />

<strong>the</strong> community you want <strong>to</strong> examine (in <strong>the</strong> Community List window), and select <strong>the</strong><br />

Open but<strong>to</strong>n, or if you like, just double-click on <strong>the</strong> community in which you are<br />

interested. When <strong>the</strong> community first opens, you see a list of <strong>the</strong> available agents<br />

(see Figure 11.22).<br />

Figure 11.22. A <strong>to</strong>p level looks at <strong>the</strong> available SNMP<br />

agents.<br />

To set <strong>the</strong> read/write permissions on an agent, select <strong>the</strong> agent, and set its access<br />

permission using <strong>the</strong> radio but<strong>to</strong>n's in <strong>the</strong> community's window header. To view a<br />

summary of all of <strong>the</strong> managed object data values, double click any of <strong>the</strong> agents.<br />

This displays a summary list of <strong>the</strong> objects and <strong>the</strong>ir values. If you want <strong>to</strong> look at<br />

each object individually, use <strong>the</strong> expansion arrows next <strong>to</strong> <strong>the</strong> agent name <strong>to</strong> see<br />

<strong>the</strong> available object groups, <strong>the</strong>n double click <strong>the</strong> object you want <strong>to</strong> see.<br />

SNMP Agents for UNIX<br />

A number of SNMP agent implementations for UNIX exist. The most common one is<br />

<strong>the</strong> ISODE version that ships with BSD UNIX, <strong>the</strong> UCD-SNMP version from <strong>the</strong><br />

University of California at Davis (available at ftp://ucd-snmp.ucdavis.edu/). The<br />

UCD-SNMP agent is a heavily modified version of <strong>the</strong> CMU-SNMP agent. There are a<br />

number of SNMP agent variations available for UNIX and each version uses a slightly<br />

different configuration. They all, however, come with documentation (some<br />

documentation being better <strong>the</strong>n o<strong>the</strong>rs). The UNIX SNMP implementations also<br />

come with a variety of SNMP <strong>to</strong>ols for viewing MIBs and polling SNMP devices.

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