How to stop of outputing into listener.log file?

In Oracle 8.0.5 $ORACLE_HOME/network/log/listener.log I see a line
<date time> * service_update * <SID> * 0 in every 10 min.
What should I do, if I don't want to see this?

I also find a line when a user connects:
<connect informations> * establish * 0
but about disconnecting there is nothing. Is it possible to log disconnecting?

Ans:
I had a similar problem. This is what I did to stop the listener.log from growing :-

lsnrctl>set log_status off

This stopped the listener.log getting filled up with the service information. I don't know if this is the only way, but it did solve my problem.

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