It should not need to be stated but you should have your favorite console cable handy for this.
These commands are used to reset your ASA back to factory default settings.
ciscoasa(config)# config factory-default Based on the management IP address and mask, the DHCP address pool size is reduced to 253 from the platform limit 256 WARNING: The boot system configuration will be cleared. The first image found in disk0:/ will be used to boot the system on the next reload. Verify there is a valid image on disk0:/ or the system will not boot. Begin to apply factory-default configuration: Clear all configuration WARNING: DHCPD bindings cleared on interface 'management', address pool removed Executing command: interface management0/0 Executing command: nameif management INFO: Security level for "management" set to 0 by default. Executing command: ip address 192.168.1.1 255.255.255.0 Executing command: security-level 100 Executing command: no shutdown Executing command: exit Executing command: http server enable Executing command: http 192.168.1.0 255.255.255.0 management Executing command: dhcpd address 192.168.1.2-192.168.1.254 management Executing command: dhcpd enable management Executing command: logging asdm informational Factory-default configuration is completed ciscoasa(config)#
And now to save this.
ciscoasa(config)# reload save-config noconfirm Cryptochecksum: 76d583b6 9edc66f8 a28d3ca7 d6642535 2620 bytes copied in 3.320 secs (873 bytes/sec) ciscoasa(config)# *** *** --- START GRACEFUL SHUTDOWN --- Shutting down isakmp Shutting down webvpn Shutting down License Controller Shutting down File system *** *** --- SHUTDOWN NOW --- Process shutdown finished