Static Nat ( Network Address Translation ) : 

Static Nat : It is used to convert private ip into public ip manually . 

- Static Nat is bidrectional means using static entry traffic can go from inside to outside as well as outside generated traffic can also come inside.

- In static nat we do one to one translation .

   ex. we can map an ip 10.1 to 12.1 using static nat in NAT TABLE at R1.

==> But we need one default route in order to reach ISP and command is : 

R1(config)#ip route 0.0.0.0 0.0.0.0 12.0.0.2

Before Translation we have to configure inside and outside interfaces as in our case inside interface is fa0/0 which is used as source mean when traffic will hit inside interface source ip will be transalated and outside interface will be fa1/1.

R1(config)#int fa0/0     
R1(config-if)#ip nat inside
R1(config-if)#exit
R1(config)#int fa1/1
R1(config-if)#ip nat outside
R1(config-if)#exit

To configure static nat command : 

R1(config)#ip nat inside source static 10.0.0.1 12.0.0.1 

Now to see NAT Table :

R1#show ip nat translations 
Pro Inside global      Inside local       Outside local      Outside global
--- 12.0.0.1           10.0.0.1           ---                ---