CCNA Day 44 - NAT (Part 1)

Private IPv4 addresses are defined in RFC [...].

1918

What is the class A range of private IPv4 addresses?

10.0.0.0/8

What is the class B range of private IPv4 addresses?

172.16.0.0/12

What is the class C range of private IPv4 addresses?

192.168.0.0/16

Can private IPv4 addresses be used over the Internet?

No

What does NAT stand for?

Network Address Translation

[...] NAT involves statically configuring one-to-one IP address mappings.

Static

Static Source NAT = [...] address is mapped to [...] address.

Inside Local / Inside Global

Cisco NAT terminology:

[...] = The IP address of the inside host from the perspective of the inside network.

Inside Local

Cisco NAT terminology:

[...] = The IP address of the inside host from the perspective of the outside network.

Inside Global

Cisco NAT terminology:

[...] = The IP address of the outside host from the perspective of the inside network.

Outside Local

Cisco NAT terminology:

[...] = The IP address of the outside host from the perspective of the outside network.

Outside Global

Configure the NAT inside interface:

R1(config-if)# [...]

ip nat inside

Configure the NAT outside interface:

R1(config-if)# [...]

ip nat outside

Configure a static source NAT mapping:

R1(config)# [...]

ip nat inside source static inside-local-ip inside-global-ip

When only source NAT is used, in the output of show ip nat translations you can expect the [...] and [...] addresses to be the same.

outside local / outside global

Show the NAT translation table:

R1# [...]

show ip nat translations

Show the NAT statistics:

R1# [...]

show ip nat statistics

Clear all dynamic NAT translation entries:

R1# [...]

clear ip nat translation *