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20.5. 配置DHCP的配置选项
提问 配置更多的DHCP配置选项提供给客户端
回答
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#ip dhcp pool ORAserver
Router1(dhcp-config)#host 172.25.1.34 255.255.255.0
Router1(dhcp-config)#client-name bigserver
Router1(dhcp-config)#default-router 172.25.1.1 172.25.1.3
Router1(dhcp-config)#domain-name oreilly.com
Router1(dhcp-config)#dns-server 172.25.1.1 10.1.2.3
Router1(dhcp-config)#netbios-name-server 172.25.1.1
Router1(dhcp-config)#netbios-node-type h-node
Router1(dhcp-config)#option 66 ip 10.1.1.1
Router1(dhcp-config)#option 33 ip 192.0.2.1 172.25.1.3
Router1(dhcp-config)#option 31 hex 01
Router1(dhcp-config)#lease 2
Router1(dhcp-config)#exit
Router1(config)#end
Router1#
注释 Option 66 定义TFTP服务器; Option 33定义静态路由; Option 31定义客户端使用IRDP.
20.6. 配置DHCP的分配时长
提问 修改缺省DHCP分配时长
回答
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#ip dhcp pool 172.25.2.0/24
Router1(dhcp-config)#lease 2 12 30
Router1(dhcp-config)#exit
Router1(config)#end
Router1#
注释 缺省分配为一天,配置选项为天,小时,分钟
20.7. 分配静态IP地址
提问 每次都分配给某个特定设备特定IP地址
回答
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#ip dhcp pool IAN
Router1(dhcp-config)#host 172.25.1.33 255.255.255.0
Router1(dhcp-config)#client-identifier 0100.0103.85e9.87
Router1(dhcp-config)#client-name win2k
Router1(dhcp-config)#default-router 172.25.1.1
Router1(dhcp-config)#domain-name oreilly.com
Router1(dhcp-config)#dns-server 172.25.1.1
Router1(dhcp-config)#exit
Router1(config)#end
Router1#
注释 这里通过MAC地址来绑定某个IP地址。Client-identifier后面跟的是MAC地址,不过比传统MAC地址多了0100,代表是以太网,对于更多的媒介类型值参考RFC 3232中的Number Hardware Type部分
Router1#show ip dhcp binding
IP address Hardware address Lease expiration Type
172.25.1.33 0100.0103.85e9.87 Infinite Manual
172.25.1.52 0100.50da.2a5e.a2 Apr 11 2006 09:00 PM Automatic
172.25.1.53 0100.0103.ea1b.ed Apr 11 2006 08:58 PM Automatic
20.8. 配置一个DHCP 数据库客户端
提问 在另一个设备上备份当前的DHCP数据库
回答
FTP方式
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#ip dhcp database ftp://dhcp:bindsave@172.25.1.1/dhcp-leases
Router1(config)#end
Router1#
TFTP 方式
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#ip dhcp database tftp://172.25.1.1/dhcp-leases
Router1(config)#end
Router1#
RCP方式
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#ip dhcp database rcp://dhcp@172.25.1.1/dhcp-leases
Router1(config)#end
Router1#
注释 通常DHCP数据库保存于内存,如果重启就会丢失,可以使用上述方式进行备份从而不会丢失,通过下述命令验证
Router1#show ip dhcp database
URL : ftp://dhcp:bindsave@172.25.1.1/dhcp-leases
Read : Never
Written : Apr 09 2006 10:24 PM
Status : Last write succeeded. Agent information is up-to-date.
Delay : 300 seconds
Timeout : 300 seconds
Failures : 1
Successes: 30
20.9. 在同一子网配置多个DHCP服务器
提问 在同一子网配置多个DHCP服务器来增加可用性
回答
Router1:
Router1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#ip dhcp pool 172.22.1.0/24
Router1(dhcp-config)#network 172.22.1.0 255.255.255.0
Router1(dhcp-config)#default-router 172.22.1.1
Router1(dhcp-config)#domain-name oreilly.com
Router1(dhcp-config)#dns-server 172.25.1.1 10.1.2.3
Router1(dhcp-config)#exit
Router1(config)#ip dhcp excluded-address 172.22.1.1 172.22.1.49
Router1(config)#ip dhcp excluded-address 172.22.1.150 172.22.1.254
Router1(config)#ip dhcp database ftp://dhcp:bindsave@172.25.1.1/dhcp-leases-rtr1
Router1(config)#end
Router1#
Router2:
Router2#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router2(config)#ip dhcp pool 172.22.1.0/24
Router2(dhcp-config)#network 172.22.1.0 255.255.255.0
Router2(dhcp-config)#default-router 172.22.1.1
Router2(dhcp-config)#domain-name oreilly.com
Router2(dhcp-config)#dns-server 172.25.1.1 10.1.2.3
Router2(dhcp-config)#exit
Router2(config)#ip dhcp excluded-address 172.22.1.1 172.22.1.149
Router2(config)#ip dhcp database ftp://dhcp:bindsave@172.25.1.1/dhcp-leases-rtr2
Router2(config)#end
Router2#
注释 要确保配置的地址池不重复,Router1 分配地址为从172.25.1.50到172.25.1.149, Router2 分配地址为从 172.25.1.150 到172.25.1.254, |
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