Chapter26 Network Address Translation
Network Address Translation Rules
26-18
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
From inside to outside
Choose this option if you want to translate private addresses on the LAN to legal
addresses on the Internet or on your organization’s intranet. You may want to
choose this option if you use private addresses on your LAN that are not globally
unique on the Internet.
Translate from Interface
This area shows the interfaces from which packets needing address translation
come in to the router. It provides fields for you to specify the IP address of a single
host, or a network address and subnet mask that represent the hosts on a network.
Inside Interface(s)
If you chose From inside to outside for Direction, this area lists the designated
inside interfaces.
Note If this area contains no interface names, close the Add Address Translation Rule
window, click Designate NAT interfaces in the NAT window, and designate the
router interfaces as inside or outside. Then return to this window and configure
the NAT rule.
IP Address
Do one of the following:
•If you want to create a one-to-one static mapping between the address of a
single host and a translated address, known as the inside global address, enter
the IP address for that host. Do not enter a subnet mask in the Network Mask
field.
•If you want to create n-to-n mappings between the private addresses in a
subnet to corresponding inside global addresses, enter any valid address fr om
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 of a 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.