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1. TO CONFIGURE STATIC NAT------------
r3>en
r3#conf t
r3(config)#int serial 0/0
r3(config-if)#ip nat outside
r3(config-if)#int fa 0/0
r3(config-if)#ip nat inside
r3(config-if)#exit
r3(config)#ip nat inside source static 10.0.0.2 20.0.0.3
r3(config)#exit
r3#sh ip nat translations
r3#sh ip nat statistics
TO REMOVE STATIC NAT:----
r3#conf t
r3(config)#no ip nat inside source static 10.0.0.2 20.0.0.3
HOW TO CONFIGURE DYNAMIC NAT---
r3>en
r3#conf t
r3(config)#int serial 0/0
r3(config-if)#ip nat outside
r3(config-if)#int fa 0/0
r3(config-if)#ip nat inside
r3(config-if)#exit
r3(config)#ip nat pool partho 20.0.0.3 20.0.0.5 netmask 255.255.255.0
r3(config)#access-list 1 permit any
r3(config)#ip nat inside source list 1 pool partho
r3(config)#^Z
r3#sh ip nat translations
r3#sh ip nat statistics
r3#clear ip nat translation *
HOW TO REMOVE DYNAMIC NAT------------
r3>en
r3#conf t
r3(config)#no ip nat inside source list 1 pool partho forced
r3(config)#no access-list 1
r3(config)#no ip nat pool partho
HOW TO CONFIGURE DYNAMIC NAT WITH OVERLOAD (PAT- PORT ADDRESS TRANSLATION)---
r3>en
r3#conf t
r3(config)#int serial 0/0
r3(config-if)#ip nat outside
r3(config-if)#int fa 0/0
r3(config-if)#ip nat inside
r3(config-if)#exit
r3(config)#ip nat pool partho 20.0.0.1 20.0.0.1 prefix-length 24
r3(config)#access-list 1 permit any
r3(config)#ip nat inside source list 1 pool partho overload
r3(config)#^Z
r3#sh ip nat translations
r3#sh ip nat statistics
r3#clear ip nat translation *

2. HOW TO REMOVE DYNAMIC NAT WITH OVERLOAD (PAT- PORT ADDRESS TRANSLATION)---
r3>en
r3#conf t
r3(config)#no ip nat inside source list 1 pool partho forced
r3(config)#no access-list 1
r3(config)#no ip nat pool partho