SNMP Reference Guide

Introduction 35
In the preceding example, the OID prefix for the Dell enterprise would be
1.3.6.1.4.1.674.
The numbers in boldface type show the categories and numbers that apply to
Server Administrator. All Server Administrator-defined OIDs consist of
1.3.6.1.4.1.674 followed by additional component values.
SNMP Security
SNMP version 1 has a very limited security mechanism. SNMP agents
support the use of a community string, which is configured at each SNMP
agent and is passed as a part of all SNMP request messages. There is no
verification that the requester is actually a member of the
specified community. As most system and network management data is not
confidential, this limited security is acceptable for Get types of requests. On
the other hand, this security is not acceptable for Set types of operations
where an SNMP request could power off a system, reconfigure a redundant
array of independent disks (RAID) card, and so on. Some vendors have
chosen not to support SNMP Set operations for this reason. Server
Administrator is able to support SNMP Set operations because its SNMP
agents implement a hash/digest mechanism to prevent unauthorized SNMP
Set operations. One limitation of this practice is that only server
administrator-developed SNMP management applications have the capability
to support the hash/digest mechanism.
NOTE: The default SNMP agent configuration usually includes a SNMP community
name such as public. For security reasons, change the SNMP community names
from their default values. For information about changing SNMP community names,
see the
Dell OpenManage Server Administrator User’s Guide available on the Dell
Support website at support.dell.com/manuals. For additional guidelines, see the
Securing an SNMP Environment article, dated May 2003, in the Dell Power
Solutions magazine. This magazine is also available at dell.com/powersolutions.
NOTE: Server Administrator provides support to enable or disable SNMP Set
operations. For more information on enabling or disabling SNMP Set operations in
Server Administrator, see the
Dell OpenManage Server Administrator User’s Guide
or the Dell OpenManage Server Administrator Command Line Interface
User's Guide
on the Dell Support website at support.dell.com/manuals.
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