deny the network to log the messages in my machine --
[network should not log any kind messages to my machine].
means that syslog should not log masseges logged from the network. how ??

This question dosn't make any sense. Try rewording it or telling us what you are trying to do.

It sounds like there are messages (e-mails?) from some kind of network (LAN Internet) that arrive at your machine. You want to allow the messages, but you don't want them to appear in a log file. Is this correct?

Thanku for replying !!

i can explain by an example

say two machines are there in local network.
host1 10.18.7.12
host2 10.18.7.13


At host1, syslog.conf is configured like below

auth.info @10.18.7.13

At host2, syslog.conf is configured like below

auth.info /var/log/auth


Whenever authentication type of events(e.g logging in to machine) is generated at 10.18.7.12,that events will be logged into the file /var/log/auth at 10.18.7.13.
But, i dont want to accept any messages from any host at 10.18.7.13.
How can i block those messages delivered from remote hosts??

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regards,
uday

This would imply that on 10.18.7.13 syslogd was deliberately configured to accept remote messages (by using the "-r" option). So you could either stop it from listening by removing the "-r" option (from whatever config file your syslogd uses) or you could also just firewall UDP port 514.