Sec16 NAT

Public IP address range:

A: 1.0.0.0/8

B: 128.0.0.0/16

C: 192.0.0.0/24

Private IP address range:

A: 10.0.0.0/8

B: 172.16.0.0/12

C: 192.168.0.0/16

Inside local address and outside local address. Local address is private address.

Inside global address and outside global address. Global address is public address.

Static NAT

R1(confin-int)#ip nat inside

R1(confin-int)#ip nat inside

R1(confin-int)#ip nat outside

R1(config)#ip nat inside source static 10.1.1.2 200.1.1.1

R1(config)#ip nat inside source static 10.1.1.22 200.1.1.2

R1#show ip nat transmission

Dynamic NAT - Work similar to DHCP, Automatically assign ip address within pool

ip nat inside

ip nat inside

ip nat ourside

ip nat pool CCNA 200.1.1.1 200.1.1.5 netmask 255.255.255.0

access-list 2 permit host 10.1.1.2

access-list 2 permit host 10.1.1.22

ip nat inside source list 2 pool CCNA

PAT (port address translation)

ip nat inside

ip nat inside

ip nat ourside

access-list 2 permit host 10.1.1.2

access-list 2 permit host 10.1.1.22

ip nat inside source list 2 interface serial 2/0 overload 

show ip nat stat