[syslog-ng] Syslog-ng missing few logs to write to local file after showing in tcpdump

Hi All I have syslog-ng (syslog-ng-3.9.1-1.el6.x86_64) which is running on Red Hat 6.6. I have rule defined as mentioned below destination d_networkx { file("/mnt/u001/syslog/$HOST/$YEAR$MONTH$DAY/network.log"); }; But syslog-ng is unable to write some logs to local file even though we see those logs in the tcpdump? What could be causing this. And one more thing need to know , is ther any way to check per filter (d_networkx) how many we received and how many we Processed(wrote) to a file Regards Harish Shetty