8.1.7 Intelligent Agent on Redhat Linux 6.2

Question

Hello,
Can anyone help?
My OEM fails to discover a Redhat Linux node but I can manually configure it (so the node address must be OK). When I check that the agent is running (lsnrctl dbsnmp_agent) it says that the db subagent is already running. If there is something obvious, I've probably missed it because I'm relatively new to both Oracle and Linux/Unix. Any clues, please?

Answer 1

I found this reply on Oracle Metalink and it worked for me (looks like agent on Linux for some reason does not use default ports:
On IA nodes, edit the snmp_rw.ora file and add the following lines :
DBSNMP.ADDRESS = (ADDRESS=(PROTOCOL=tcp)(HOST=<ip-address>)(PORT=1748))
DBSNMP.SPAWNADDRESS = (ADDRESS=(PROTOCOL=tcp)(HOST=<ip-address>)(PORT=
1754))
where <ip-address> is the IP-Address of the node to be discovered.
Note: ports 1748/1754 must be open for the OMS to communicate with the Agent.
The OMS starts communication on ports 1748 and 1754 to get the discovery
information from the Intelligent Agent.
The ports 1748 and 1754 are dedicated for the Intelligent Agent, and should
not be used by any other program.
Ports used by the Intelligent Agent:
++++++++++++++++++++++++++
During the discovery phase, the Communication Daemon OMS
will contact the Intelligent Agent via the ports 1748 and 1754 and retrieve
the discovery information.
Port 1748 is used for the basic communication, while the port 1754 is
used for file transfer. The communication is always initiated from the
Communication Daemon or OMS towards the Intelligent Agent.
The ports are hardcoded in the Intelligent Agent and should not be altered
in any way. The ports are referenced in the snmp_rw.ora file as:
dbsnmp.address=(address=(protocol=tcp)(host=somehostname)(port=1748))
dbsnmp.spawnaddress=(address=(protocol=tcp)(host=somehostname)(port=1754))
The meaning of the dbsnmp.address and dbsnmp.spawnaddress are solely to
determine the resolution path for the Enterprise Manager framework to get
in touch with the Intelligent Agent, and should not be used to specify
other ports.