NAT 1 to 1 and 1 to Many?

[ruben]

We have 32 static IP from our ISP.

All of these are NAT 1-->1 from FastEthernet 0/1 to FastEthernet 0/0. However, now we need to have one of the static IP's to many (NAT 1-->many) from FastEthernet 0/1 to FastEthernet 1/0.

Currently 1-1 NAT is done by:

FastEth 0/1 FastEth 0/0

192.168.x.10 --> 217.x.x.74

192.168.x.11 --> 217.x.x.75

...

FastEth 1/0 has DHCP IP range from 10.0.1.0/255.255.255.0

How do we NAT 1--many

FastEth 1/0 FastEth 0/1

10.0.1.0/255.255.255.0 --> 217.x.x.80

Ruben

[doliver · Accepted solution]

Ruben,

You can accomplish this with NAT overload (commonly known as Port Address Translation or PAT.)

access-list 10 permit 10.0.1.0 0.0.0.255

!

int fa1/0

ip address 10.0.1.x 255.255.255.0

ip nat inside

!

int fa0/1

ip address 217.x.x.80 255.255.255.x

ip nat outside

!

ip nat inside source list 10 interface fa0/1 overload

This should get you started.

HTH

Dean