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7 DNS The LoadMaster sends Source-of-Authority (SOA) request to the Real Server on the
Service port (port 53 UDP). If the server successfully responds to the SOA request,
the LoadMaster marks it as active. If the server fails to respond within the configured
response time for the configured number of times or if it responds unsuccessfully to
the SOA request, it is assumed dead.
Refer to Section III Command Line Interface Reference Guide, on how to best configure your balancer for
health checking.
L. SNMP Support
Simple Network Management Protocol (SNMP) is a protocol that allows one to manage many network devices
over the network from a remote management station (SNMP manager).
The manager station can request data from the managed stations (SNMP agents) or it can change the value of
data on the agents.
The managed stations (SNMP agents) can also be set up to alert the manager when some predefined events
occur, e.g. such as a unit failover. The alerting mechanism uses so-called event traps.
For a description of the SNMP standard see References (p. 37). The current version is SNMPv3, the two other
major revisions in use are SNMPv1 and SNMPv2c (community-based SNMPv2).
The SNMP support of the LoadMaster is based on SNMPv3, so that all 3 of the above versions can be used.
However, since SNMPv1 does not support 64bit-values (as used in the LoadMaster MIB), it is recommended to
use SNMPv2c or SNMPv3.
1. LoadMaster Performance Metrics via SNMP
The information regarding all LoadMaster-specific data objects is stored in three enterprise-specific MIBs
(Management Information Base).
ONE4NET-MIB.txt enterprise id
IPVS-MIB.txt Virtual Server stats
B-100-MIB.txt LoadMaster configuration data
These MIBs (located on the LoadMaster CD) need to be installed on the SNMP manager machine in order to be
able to request the performance-/config-data of the LoadMaster via
SNMP.
The description of the counters can be taken from the LoadMaster MIBs (the description clause).
Apart form just reading the MIB this can be done for Linux (nad ucdsnmp) with the command:
snmptranslate -Td -OS <oid>
where <oid> is the object identifier in question.
Example: <oid> = .1.3.6.1.4.1.one4net.ipvs.ipvsRSTable.rsEntry.RSConns
snmptranslate -Td –Ov .1.3.6.1.4.1.one4net.ipvs.ipvsRSTable.rsEntry.RSConns
.1.3.6.1.4.1.12196.12.2.1.12
RSConns OBJECT-TYPE
-- FROM IPVS-MIB
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION "the total number of connections for this RS"
::= { iso(1) org(3) dod(6) internet(1) private(4) enterprises(1)
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