If the device (ASA) is not purchased as a new device, the best practice is to wipe the old configurations.
Part A:These are the steps below:
Step 1: Erase the configuration of the ASA
CiscoASA# wr er
Step 2: Reload the ASA without confirmation
CiscoASA# reload noconfirmation
Step 3: Now apply Cisco default configuration
– Note: this is necessary to have a configuration in the flash memory since we have cleared it previously
CiscoASA# config factory-default
Never do this in a production environment
Step 4: Save the configuration
Part B: To configure the Cisco ASA using Cisco ASDM
– Step 1: On your favourite web browser, run the management IP Address “https://10.10.1.1
– Step 2: click on run Startup Wizard.
Now you can configure the hostname, password, DHCP (if you wish to use it as a DHCP Server) etc.
– Step 3: Enable Network Address Translation (NAT)/ Port Address Translation (PAT) in order for the internal network to use you configured public address.
Note: Private IP Address are not routable over the internet.
– Step 4: Enable the ASDM logging.
This is option but very handy as it allows for troubleshooting when the need arises.
– Step 5: I think for me its vital to enable the preview mode in order
to be able to view the configuration before deploying it.
– Click on Tools
– Click on preferences
– under communication and select “preview commands before sending it to the device”