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prevent dynamic port allocation in dedicated server configuration

Posted on 2003-03-24
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I have an Oracle 8i database running in Dedicated server configuration. The issue i am facing with this configuration is that the ports being used for client communication are dynamically allocated which prevents implementation of a firewall to limit the ports being made available for communication.

I am interested to know if i can force a set of ports to be used everytime by the server porcesses? I know if i have MTS configuration then i can assign the ports to be used while defining the dispatchers in initsid.ora. But can i do something similar in dedicated server environment.

Just curious, can prespawned server processes help in this regard?

Thanks in advance!

Amal
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Question by:amal_rakshit
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4 Comments
 
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Expert Comment

by:BobMc
ID: 8206831
Have a look at Connection Manager in the Net8 docs.

Alternatively, you can set USE_SHARED_SOCKET=TRUE in the registry (HKLM\Software\Oracle\Home<n>) or as a system environment parameter.
This will force all new connections to spawn a new thread on the listening port.

What OS are you using? How may concurrent connections are you expecting?

HTH
Bob
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Author Comment

by:amal_rakshit
ID: 8208224
Thanks BobMc!

I am aware of the Connection manager option but want to explore other ways of achieving this.

I need further clarification on the second option you suggested. Do you mean to say that all new connections will be spawned as threads on the same port as that of the Listener (for eg: 1521)? Hence I do not need other ports to be opened for client connections?

We have NT as the OS. I am sorry I did not mention it earlier. Also, we expect about 100 concurrent connections.

regards
Amal

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Accepted Solution

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BobMc earned 1500 total points
ID: 8219610
Amal,

All connections would be on the same port - 1521 in this case. So you wouldn't need to open up additional ports for the clients.

To be honest, Im not sure how far this solution would scale, but if 100 concurrent users was a problem, you could always add multiple listener ports (1521, 1522, etc) and spread the addresses about your clients.

I have also heard of Sqlnet proxies (I think its built into the firewall) but I have no information at hand about this and everyone else has gone home!

HTH
Bob

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Author Comment

by:amal_rakshit
ID: 8274821
Thanks once again Bob!

I think the USE_SHARE_SOCKET parameter is the solution for our requirements.

regards,
Amal
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