[syslog-ng]Issues with names in syslog-ng

Hi Folks, I am using syslog-ng as a syslog server for Cisco Content Switches. I receive logs and all fine. The only problem is I receive the syslog message but no hostname associated with it. When I move it to syslogd, i receive hostnames as well. Here is the quick example. NOV 15 02:35:40 1/1 3880 NETMAN-1: TRAP:Authentication:Generated by: 1.1.1.1 (this is the actual syslog message generated) syslog-ng displays as it but syslogd displays it as: NOV 15 02:35:40 alpha.beta.com 1/1 3880 NETMAN-1: TRAP:Authentication:Generated by: 1.1.1.1 I really need DNS names to be displayed otherwise I simply dont know which device is logging this message. Pls let me know if something needs to be added in my conf file. thx in advance Shahid