Paradyne 9128-II, CSU, DSU, 9126-II Network Address Port Translation, Napt Configuration Example

5. Configuring the FrameSaver SLV Router

Network Address Port Translation

Network Address Port Translation (NAPT) allows multiple clients in a local network to simultaneously access remote networks using a single IP address. This benefits telecommuters and SOHO (Small Office/Home Office) users that have multiple clients in an office running TCP/UDP applications. NAPT is sometimes referred to as PAT (Port Address Translation).

NAPT provides a many-to-one mapping and uses one public address to interface numerous private users to an external network. All hosts on the global side view all hosts on the local side as one Internet host. The local hosts continue to use their corporate or private addresses. When the hosts are communicating with each other, the translation is based on the IP address and the IP port numbers used by

CP/IP applications. Only TCP/UDP applications can access the public network.

NAPT Configuration Example

NAPT Example
	Public IP	10.1.3.1
Public	Address

Network

FrameSaver SLV

Router

Ethernet

Private

Network

02-17298

In this NAPT example the router is configured for NAPT using:

A single public IP address. Multiple public addresses can be used.

TA public network. NAPT can also be used between private networks. An access list. A pool can also be used, instead or in addition.

NAPT Mapping Public IP Address	Private IP Addresses
172.20.95.2:zzzz	10.1.3.2:zzzz
172.20.95.2:yyyy	10.1.3.3:yyyy
172.20.95.2:xxxx	10.1.3.4:xxxx

5-8 September 2002 9128-A2-GB20-80