If you are using 6.x code, debug output is not sent as syslogs. However, if you are using 7.x code, you can use following commands to send debug outputs to your syslogs-
logging list dbgmsg message 711001
logging terminal dbgmsg
logging debug-trace
logging enable
Now, if we enable "debug icmp trace", debug output will be sent to your terminal screen as a syslog message. We can configure PIX similarly to send the debug outputs to
a syslog server.
Notes:
Syslog 711001 is where all debugs are sent when the 'logging debug-trace' option is enabled.
Hope this helps.
Regards,
Vibhor.