Cisco Firewall Mode

Transparent mode configuration
PIX# show firewall
Firewall mode: Router
PIX# configure terminal
PIX(config)# firewall transparent
PIX(config)# show firewall
Firewall mode: Transparent


Routed mode configuration
PIX# show firewall
Firewall mode: Transparent
PIX# configure terminal
PIX(config)# firewall router
PIX(config)# show firewall
Firewall mode: Router
 
Reference:
http://sites.google.com/site/amitsciscozone/home/security/firewall-modes
http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/fwmode.html