Table of Contents
Advertisement
S9700 Core Routing Switch
Configuration Guide - SPU
3.1 NAT Overview
NAT enables hosts on a private network to access the public network.
Private Network Address and Public Network Address
A private network address, which is also called a private address, is the IP address of an internal
network or host. A public network address, which is also called a public address, is a unique IP
address on the Internet. The Internet Assigned Number Authority (IANA) defines the following
IP addresses as private addresses:
l
l
l
After planning the scale of the intranet, an enterprise chooses the proper private address segment.
The private address segments of enterprises can overlap each other. If an intranet does not use
the IP address in the defined private address segments, errors may occur during communication
with other networks.
Principle of NAT
As shown in
accesses the Internet or interworks with the hosts on a public network.
Figure 3-1 Networking of NAT
WWW Server
The private network uses network segment 10.0.0.0 and its public address is 203.196.3.23. The
host 10.1.1.48 on the private network accesses the server 202.18.245.251 on the public network
in Web mode.
Issue 01 (2012-03-15)
Class A: 10.0.0.0-10.255.255.255
Class B: 172.16.0.0-172.31.255.255
Class C: 192.168.0.0-192.168.255.255
Figure
3-1, the private address must be translated when a host on a private network
PC
10.1.1.10
203.196.3.23
202.18.245.251
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
WWW client
........
10.1.1.48
Internal network
SPU
External network
3 NAT Configuration
PC
85
Advertisement
Table of Contents
