Specifications

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Cisco 1700 Series Router Software Configuration Guide
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Chapter 3 Miscellaneous Features
Configuring Network Address Translation
Then indicate that any packet received on the inside interface, as permitted by
access list 7, will have its source address translated to an address from the NAT
pool “no-overload.”
ip nat inside source list 7 pool no-overload
Alternatively, when all inside addresses are translated to a single outside address,
define a NAT pool named “ovrld,” which has a range of a single IP address:
172.16.10.1.
ip nat pool ovrld 172.16.10.1 172.16.10.1 prefix 24
Then indicate that any packet received on the inside interface, as permitted by
access list 7, will have its source address translated to the address from the NAT
pool “ovrld.” Translations will be overloaded, which will allow multiple inside
devices to be translated to the same outside IP address.
ip nat inside source list 7 pool ovrld overload
The keyword overload used in this command allows NAT to translate multiple
inside devices to the single address in the pool.
Another variation of this command is
ip nat inside source list 7 interface outside interface overload
which configures NAT to overload on the address that is assigned to the outside
interface.