Specifications

Terms and Definitions
September 08, 2010 Page 17 of 18
Define the NAT Pools for Global Addresses
DefinetheNATPoolfortheNATclients:
System(rw-config)->ip nat pool natpool 200.1.1.1 200.1.1.2 netmask 255.255.255.0
DefinetheNATPoolfortheNAPTclients:
System(rw-config)->ip nat pool naptpool 200.1.1.3 200.1.1.3 netmask
255.255.255.0
System(rw-config)->
Enable Dynamic Translation of Inside Source Addresses
EnabletheNATdynamictranslationoftheinsidesourceaddress:
System(rw-config)->ip nat inside source list 1 pool natpool
EnabletheNAPTdynamictranslationoftheinsidesourceaddress:
System(rw-config)->ip nat inside source list 2 pool naptpool overload
ThiscompletestheNATconfigurationexample.
Terms and Definitions
Table 5liststermsanddefinitionsusedinthisNATconf igurationdiscussion.
Table 5 NAT Configuration Terms and Definitions
Term Definition
Basic NAT Refers to Network Address Translation (NAT) only.
Dynamic Address
Binding
Provides a binding based upon an internal algorithm between an address from an
access-list of local addresses to an address from a pool of global addresses for NAT
and TCP/UDP port number translations for NAPT.
Inside (private)
address
An IP address internal to the network only reachable by the external network by
translation.
NAT Address Pool A grouping of global addresses used by both NAT and NAPT dynamic address
binding.
Network Address
Port Translation
(NAPT)
Provides a mechanism to connect a realm with private addresses to an external
realm with globally unique registered addresses by mapping many network
addresses, along with their associated TCP/UDP ports into a single network address
and its associated TCP/UDP ports.
Network Address
Translation (NAT)
Provides a mechanism to connect an internal realm with private addresses to an
external realm with globally unique registered addresses by mapping IP addresses
from one group to another, transparent to the end user.
Outside (public)
address
A registered global IP address external to the private network that the inside address
is translated to.
Static Address
Binding
Provides a one-to-one binding between local addresses to global addresses for NAT
and TCP/UDP port number translations for NAPT.
Traditional NAT Refers to both NAT and NAPT.