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在实际的网络环境中经常需要通过路由器拨号到ISP，这时路由器的IP 地址有ISP采用DHCP的方式给定。IBM路由器在MRS 3.3版本之后提供了对于动态IP地址的支持。
动态地址具有以下3个方面的作用：
提供了路由器通过IPCP取得PPP端口IP地址的能力。
如果IPCP同时提供 DNS 的信息，DHCP客户端也可以得到这些信息。
动态更新IP 访问控制，这样定义的filter就可以用于NAT/NAPT。
动态IP的功能使 IBM 路由器具备连接ISP并从ISP取得IP地址的能力，而不必事先知道IP地址
动态IP地址的设置
我们下面将通过一个例子来说明动态IP地址的具体配置。在这个例子中我们将同时配置 isp端和客户端的路由器。动态 IP 将在客户端的路由器上配置，客户端路由器会从isp端的路由器取得公网的IP地址。并且客户端路由器也激活了DHCP服务器和NAT功能。
网络拓扑图如下：
ISP 端路由器的配置
设置系统名为isp。
添加Token ring 接口。
Config (only)>set hostname isp
Host name updated successfully
Config (only)>add device tr-2
Device Slot #(1-4) [1]?
Device Port #(1-2) [1]?
Adding 2-port IBM Token Ring device in slot 1 port 1 as interface #4
Use "net 4" to configure 2-port IBM Token Ring parameters
设置 WAN 口，使其支持远程拨入。
在WAN口上添加dial-in circuit。
Config (only)>set data v34 2
Config (only)>add device dial-in
Enter the number of PPP Dial-in Circuit interfaces [1]?
Adding device as interface 5
Defaulting data-link protocol to PPP
Base net for this circuit [0]? 2
Enable as a Multilink PPP link? [no]
Disabled as a Multilink PPP link.
Add more dial circuit interface(s)?(Yes or [No]):
Use "set data-link" command to change the data-link protocol
Use "net " command to configure dial circuit parameters
添加远程拨入的ppp用户 'aaa'。
onfig (only)>add ppp-user
Enter name: []? aaa
Password:
Enter again to verify:
Allow inbound access for user? (Yes, No): [Yes]
Will user be tunneled? (Yes, No): [No]
Is this a 'DIALs' user? (Yes, No): [Yes]
Type of route? (hostroute, netroute): [hostroute]
Number of days before account expires [0-1000] [0]?
Number of grace logins allowed after an expiration [0-100] [0]?
IP address: [0.0.0.0]?
Enter hostname: []?
Allow virtual connections? (Yes, No): [No]
Give user default time allotted ? (Yes, No): [Yes]
Enable callback for user? (Yes, No): [No]
Will user be able to dial-out ? (Yes, No): [No]
Set ECP encryption key for this user? (Yes, No): [No]
Disable user ? (Yes, No): [No]
PPP user name: aaa
User IP address: Interface Default
Netroute Mask: 255.255.255.255
Hostname:
Virtual Conn: disabled
Time alotted: Box Default
Callback type: disabled
Dial-out: disabled
Status: enabled
Account Expiry:
Password Expiry:
Is information correct? (Yes, No, Quit): [Yes]
User 'aaa' has been added
设置 IPCP 使拨入端口向远端客户端发送IP 地址。
Config (only)>n 5
Circuit configuration
isp Dial-in Circuit config: 5>enc
Point-to-Point user configuration
isp PPP 5 Config>set ipcp
IP COMPRESSION [no]:
Request an IP address [no]:
Send our IP address [no]: y
Note: unnumbered interface addresses will not be sent.
Interface remote IP address to offer if requested (0.0.0.0 for none)
[0.0.0.0]? 9.1.1.1
isp PPP 5 Config>exit
isp Dial-in Circuit config: 5>exit
设置token ring 端口的IP地址
设置dial in circuit 端口的IP地址
Config (only)>p ip
Internet protocol user configuration
isp IP config>add add 4 192.1.1.254 255.255.255.0
isp IP config>add add 5 9.1.1.2 255.255.255.255
isp IP config>ena arp-subnet-routing
isp IP config>exit
设置发到客户端的DNS 的IP 地址。
Config (only)>fea dials
Dial-in Access to LANs global configuration
isp DIALs config>set enable dynamic
isp DIALs config>set dns primary
Primary Domain Name Server (DNS) address [0.0.0.0]? 192.1.1.240
isp DIALs config>exit
客户端路由器的配置：
设置系统名为client.
添加token ring 接口
设置WAN 口并连接V34 modem.
在WAN口上添加dial circuit
Config (only)>set host client
Config (only)>add device tr-2
Device Slot #(1-4) [1]?
Device Port #(1-2) [1]?
Adding 2-port IBM Token Ring device in slot 1 port 1 as interface #4
Use "net 4" to configure 2-port IBM Token Ring parameters
config (only)>set data v34
Interface Number [0]? 2
Config (only)>add device dial
Base net for the circuit(s) [0]? 2
Enter the number of PPP Dial Circuit interfaces [1]?
Adding device as interface 5
Defaulting data-link protocol to PPP
Add more dial circuit interface(s)?(Yes or [No]):
Use "set data-link" command to change the data-link protocol
在token ring 端口上添加 IP地址
在dial circuit 端口上添加 IP地址
添加通过 dial circuit 端口的缺省路由。
在dial circuit 端口上激活动态 IP
Config (only)>p ip
Internet protocol user configuration
client IP config>add add 4 192.168.89.254 255.255.255.0
client IP config>add add 5 0.0.0.5 255.255.255.255
client IP config>add router 0.0.0.0 0.0.0.0 0.0.0.5
Cost [1]?
client IP config>enable dynamic
Interface address []? 0.0.0.5
client IP config>exit
激活 DHCP 服务器功能
添加token ring 端口的IP子网掩码。
添加源DNS 的IP 地址。
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