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For Red Hat Enterprise Linux and VMware ESXi 4.0 operating systems, the default SNMP agent configuration gives read-
only access for the
public
community only to the MIB-II
system
branch (identified by the 1.3.6.1.2.1.1 OID) of the MIB
tree. This configuration does not allow management applications to retrieve or change Server Administrator or other
systems management information outside of the MIB-II
system
branch.
Server Administrator SNMP Agent Install Actions
If Server Administrator detects the default SNMP configuration during installation, it attempts to modify the SNMP agent
configuration to give read-only access to the entire MIB tree for the public community. Server Administrator modifies
the SNMP agent configuration file
/etc/snm, p/snmpd.conf by:
• Creating a vew to the entire MIB tree by adding the following line if it does not exist: view all included
• Modifying the default access line to give read-only access to the entire MIB tree for the public community. Server
Administrator looks for the following line: access notConfigGroup "" any noauth exact
systemview none none
• If Server Administrator finds the above line, it modifies the line as: access notConfigGroup "" any
noauth exact all none none
NOTE: To ensure that Server Administrator is able to modify the SNMP agent configuration for providing
proper access to systems management data, it is recommended that any other SNMP agent configuration
changes be made after installing Server Administrator.
Server Administrator SNMP communicates with the SNMP agent using the SNMP Multiplexing (SMUX) protocol. When
Server Administrator SNMP connects to the SNMP agent, it sends an object identifier to the SNMP agent to identify
itself as a SMUX peer. Because that object identifier must be configured with the SNMP agent, Server Administrator
adds the following line to the SNMP agent configuration file, /etc/snmp/snmpd.conf, during installation if it does not
exist:
smuxpeer .1.3.6.1.4.1.674.10892.1
Changing The SNMP Community Name
Configuring the SNMP community name determines which systems are able to manage your system through SNMP. The
SNMP community name used by management applications must match an SNMP community name configured on the
system running Server Administrator, so that the management applications can retrieve management information from
Server Administrator.
To change the SNMP community name used for retrieving management information from a system running Server
Administrator:
1. Open the SNMP agent configuration file, /etc/snmp/snmpd.conf.
2. Find the line that reads: com2sec publicsec default public or com2sec notConfigUser
default public.
NOTE: For IPv6, find the line com2sec6 notConfigUser default public. Also, add the text
agentaddress udp6:161 in the file.
3. Edit this line, replacing public with the new SNMP community name. When edited, the new line should read:
com2sec publicsec default community_name or com2sec notConfigUser default
community_name.
4. To enable SNMP configuration changes, restart the SNMP agent by typing: service snmpd restart.
Enabling SNMP Set Operations
SNMP Set operations must be enabled on the system running Server Administrator in order to change Server
Administrator attributes using IT Assistant.
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