Chapter18 Network Address Translation
Network Address Translation Rules
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Cisco Router and Security Device Manager Version 2.2 User’s Guide
OL-4015-08
IP Address
Do one of the following:
•If you want to create a one-to-one static mapping between the outside global
address of a single remote host and a translated address, known as the outside
local address, enter the IP address for the remote host.
•If you want to create n-to-n mappings between the addresses in a remote
subnet to corresponding outside local addresses, enter any valid address from
the subnet whose addresses you want translated, and enter a network mask in
the next field.
Network Mask
If you want SDM to translate the addresses in a remote subnet, enter the mask for
that subnet. SDM determines the network/subnet number and the set of addresses
needing translation from the IP address and mask that you supply.
Translate to Interface
This area shows the interfaces out of which packets with translated addresses may
exit the router. It also provides fields in which you can specify the translated
address and other information.
Inside Interface(s)
If you choose From outside to inside, this area contains the designated inside
interfaces.
IP Address
Do one of the following:
•If you are creating a one-to-one mapping between a single outside global
address and a single outside local address, enter the outside local address in
this field.
•If you are mapping the outside global addresses of a remote subnet to the
corresponding outside local addresses, enter any IP address that you want to
use in the translation in this field. The network mask entered in the Translate
from Interface area will be used to calculate the remaining outside local
addresses.