文档介绍：work Address Translation
深圳职业技术学院计算机系网络专业
教学目标( Objectives )
(Private Addressing )
2. NAT操作(NAT Operation)
3. NAT分类(NAT Class)
4. 配置NAT (Configuring NAT)
5. NAT排错
(Troubleshooting NAT Configuration)
IP Address Class and Range
Class A:
Class B:
Class C:
1-126
128-191
192-223
127 is lost, why?
公网地址和私有地址( Public Address and Private Address)
1. 公网地址必须被注册
Public addresses must be registered by pany with an authority.
2. 私有地址被保留,并可以被任何人使用
Private IP addresses are reserved and can be used by anyone.
私有地址范围(Private Address Range)
Catalyst 4006
Catalyst 6509
教学楼
工业中心
信息大楼
行政大楼
图书馆
Catalyst 6509
Catalyst 2948G
Catalyst 2948G
Catalyst 2948G
Catalyst 3548G
Catalyst 3548
Cisco 7206
163
165
Backbone Channel
Channel
LoadBalance
上期已铺光纤
本期待铺光纤
Channel
深职院二期网络核心拓扑图
HSRP
NAT操作(NAT Operation)
1. NAT典型工作存根网络的边缘
A NAT enabled device typically operates at the border of a work.
2. 边界路由器执行NAT功能,将内部私有地址转换成公网可路由的地址。
The border gateway router performs the NAT process, translating the internal private address of a host to a public, external routable address.
NAT操作(NAT Operation)
1. Inside local address –指定给内部主机使用的地址
The IP address assigned to a host on the work.
2. Inside global address –从SP或NIC注册的地址,即内部主机地址被NAT转换的外部地址
A legitimate IP address assigned by the NIC or service provider that represents one or more inside local IP addresses to the outside world.
3. Address Pool-NIC或SP分配使用的多个地址
IP addresses assigned by the NIC or service provider
NAT术语(NAT Terms)

静态NAT的特征是内部主机地址被一对一映射到外部主机地址
Static NAT is designed to allow one-to-one mapping of local and global addresses.
NAT分类(NAT Class)
Pc1:---------->
Pc2:---------->
Pc3:---------->
Pc4:---------->
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X