Cherie,

I summarised the ports used by Oracle for our Network support specialist and have 
copied it below:

Metalink note 69511.1 refers to SNMP and the Oracle agent - hopefully that document or 
some of the others listed can help you out.

"
Oracle & TCP IP Ports - for future reference

Oracle uses a number of fixed TCP ports, these include (Metalink note 99721.1 has a 
more complete list if the ports that Oracle listens on)
1521 / 1526 - used by the Oracle listener as the initial point a client connects to
2481 - the recommended and officially registered listening port for client connections 
to the Java option using TCP/IP. 
2482 - the recommended and officially registered listening port for client connections 
to the Java option using TCP/IP with SSL. 

Client Connections
xyz - ie arbitrary port
In a standard Oracle configuration , when a client connects to the listener, the 
listener spawns a dedicated connection thread for that client on a dedicated TCP port.

>From Metalink note 125021.1, the server port that is assigned to the client is 
>randomly chosen by the operating system and can't be modified.  It can be any free 
>port available that the server determines is not is use by any other software or 
>hardware.
>From note 66382.1, for the port on the client PC, what happens is that the networking 
>software on the client chooses at random, or in sequential order, a valid port 
>(between 1024 and 65535) so the client can send and receive data. 

(Metalink notes such as 125021.1, 124140.1, 2084440.6 + 66382.1 describe use of Oracle 
with Firewalls where one option is to force all clients to share the same singular TCP 
port - other possibilities include using a Firewall that supports SQLNet / Net8 or 
using Oracle's connection manager program).



The following are used for SNMP (Metalink note 69511.1)
161 - the Oracle SNMP Master agent needs to work as the SNMP master agent so it works 
on default port of 161 and SNMP itself gets moved to another port
8161 - the port we have chosen to move Windows SNMP service to

Oracle Enterprise Manager (OEM) ports (from Metalink note 94394.1)
1748 / 1754 - Used under full control by the Oracle Intelligent agent (process that 
schedules jobs and monitoring events)
These ports are used during the discovery process of Oracle services - 1748 is used 
for basic communication and 1754 is used for file transfer
7771 - The OEM client tools use this to talk to the Oracle Management Service (OMS) 
processes.
7772 -  The Oracle intelligent agent (IA) uses this to talk to the OMS
7773 - used as a SSL channel to transfer information from the Intelligent Agent to 
Enterprise Manager framework
1808 - Tools which communicate with the Oracle Data Gatherer use this port for basic 
communication
1809 - is also used for SSL communication between the client application and the Data 
Gatherer.
xyz - ie arbitrary port based on availability -    Communication from the Data 
Gatherer back to the Capacity planner is done
via a callback mechanism. Capacity Planner will initiate a communication via 1808, and 
the Data Gatherer will initiate the response back via an arbitrary port, based on 
availability.
"

HTH,
Bruce Reardon
-----Original Message-----
Sent: Tuesday, 16 July 2002 2:49

We have a third-party application that needs to use the SNMP agent
associated with OEM.   They want to be able to get to it via a particular
port.

We have a port assigned to each database, based on which Oracle version it
is running.   However, as far as I know, there is not a particular port
number associated with the OEM agent.   The only way you can designate a
particular port number is by going through a particular database.

Is this correct.   I looked through the 9.0.1 Installing the Instelligent
Agent manual and I don't see any place where it states how you can
associate the OEM agent with a specific port number on UNIX.

Does anyone know how I can do this or am I limited to just associating port
numbers with databases.

Thanks,

Cherie Machler
Oracle DBA
Gelco Information Network
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Author: Reardon, Bruce (CALBBAY)
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