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Step 1—Configuring Network Address Translation

Cisco 7100 Series VPN Configuration Guide

4-4

Table 4-1 lists the scenario’s physical elements.

Table 4-1 Physical Elements

Step 1—Conﬁguring Network Address Translation

Network Address Translation (NAT) enables private IP internetworks that use

nonregistered IP addresses to connect to the Internet. NAT is conﬁgured on the router at the

border of a stub domain (referred to as the inside network) and a public network such as the

Internet (referred to as the outside network). NAT translates the internal local addresses to

globally unique IP addresses before sending packets to the outside network. NAT also

allows a more graceful renumbering strategy for organizations that are changing service

providers or voluntarily renumbering into classless interdomain routing (CIDR) blocks.

This section only explains how to conﬁgure static translation to translate internal local IP

addresses into globally unique IP addresses before sending packets to an outside network,

which includes the following tasks:

1 Conﬁguring Static Inside Source Address Translation

Headquarters Network Business Partner Network

Site

Hardware

WAN IP

Address

Ethernet IP

Address

Site

Hardware

WAN IP

Address

Ethernet IP

Address

hq-sanjose Serial interface 2/0:

172.16.2.2

255.255.255.0

Fast Ethernet

Interface 0/0:

10.1.3.3

255.255.255.0

Fast Ethernet

Interface 0/1:

10.1.6.4

255.255.255.0

bus-ptnr Serial interface 1/0:

172.16.2.7

255.255.255.0

Fast Ethernet

Interface 0/0:

10.1.5.2

255.255.255.0

Corporate

server

– 10.1.3.6 PC B – 10.1.5.3

Web server – 10.1.6.5

1 The inside local IP address of the headquarters network’s public Web server (10.1.6.5) is translated to inside global IP address

10.2.2.2 in the “Step 1—Configuring Network Address Translation” section on page 4-4.

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