[syslog-ng] hostname disappear (L4 switch log)

[=?ks_c_5601-1987?B?sejAr7HV?=]

Hi~
when I use syslog for collecting logs (from network device Route, L2
switch, L4 switch, ) there are no prolbems. 


=> raw log(which is shown in network device) 
Nov 22 18:46:48 [11.114.116.15.1.2] NOTICE WebOS : real server
211.11.11.111 operational 

=>log that syslog get 
Nov 22 18:46:48 [11.114.116.15.1.2] NOTICE WebOS : real server
211.11.11.111 operational 

nochange!!!!!!!!!!!!!!!!!!!!!!

---------------------------
however
when I use syslog-ng for collecting logs, 


the raw log(above) has changed like this~ 

Nov 22 18:46:48 NOTICE WebOS : real server 211.11.11.111 operational 

[11.114.116.15.1.2] gone!!!!!!!!!!

I think syslog-ng ommit "[11.114.116.15.1.2]" area. 

Between network device and syslog-ng server , there are no syslog,
syslog-ng servers. 


Do you have same problem? 
plz help me 

i use Linux EL4, syslog-ng 1.6.9	





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