Chapter26 Network Address Translation
Network Address Translation Rules
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Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
•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 Cisco SDM to translate the addresses in a remote subnet, enter the
mask for that subnet. Cisco SDM determines the network and 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 from which packets with translated addresses exit
the router. It also provides fields for specifying 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.
Note If you do not enter a network mask in the Translate from Interface
area, Cisco SDM will perform only one translation.