Hello Harshi
You can use the clear xlate
command to clear all NAT entries in the NAT table.
In order to have the ASA firewall perform NAT, you will require the use of a Layer 3 inside interface and a Layer 3 outside interface. This means that you cannot use a layer 2 trunk connection on the ASA to perform the NAT. You must have a layer 3 interface on the inside.
I hope this has been helpful!
Laz