dhcp的问题

卩爿Μㄚ厢甚

路由器可以用作dhcp服务器， 加入有三台路由器，第一台路由器当做dhcp服务器 连接到第三台路由器的主机如何获得动态ip地址，三台路由器依次相连，小弟做了一个多小时的实验，但是怎么也获得不了，求高手解答一下  ，主机和dhcp服务器不跨路由器和跨一台路由器我都明白怎么配置 ，就是跨两台以上的怎么配置  谢谢 指教{:soso_e130:}

qq360870025

跨设备 需要做DHCP 中继  helper-address ｛你DHCP服务器的地址｝ 不过PT模拟器不支持

卩爿Μㄚ厢甚

跨一台可以用helper-address 这个命令  我试了  但是跨两台就不行了

ywq1122

卩爿Μㄚ厢甚 发表于 2012-4-11 15:41
跨一台可以用helper-address 这个命令  我试了  但是跨两台就不行了

前提是你要有去往dhcp服务器的路由。。。。

serven

helper-address这个命令在PT里面好像不是很支持的，如果不成功和模拟器还是有一定关系的吧！

卩爿Μㄚ厢甚

ywq1122 发表于 2012-4-11 16:04
前提是你要有去往dhcp服务器的路由。。。。

路由我都做过了  全都有

ywq1122

卩爿Μㄚ厢甚 发表于 2012-4-11 20:35
路由我都做过了  全都有

把配置贴上来看看吧

卩爿Μㄚ厢甚

ywq1122 发表于 2012-4-11 21:26
把配置贴上来看看吧

Building configuration...（第一个路由器）

Current configuration : 1059 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
ip dhcp excluded-address 18.18.18.1 18.18.18.10
ip dhcp excluded-address 19.19.19.1 19.19.19.20
ip dhcp excluded-address 25.25.25.1 25.25.25.25
!
ip dhcp pool ccnA
network 18.18.18.0 255.255.255.0
default-router 18.18.18.1
ip dhcp pool ccnp
network 19.19.19.0 255.255.255.0
default-router 19.19.19.19
ip dhcp pool ccie
network 25.25.25.0 255.255.255.0
default-router 25.25.25.1
!
!
!
!
!
!
!
no ip domain-lookup
!
!
!
!
!
!
interface FastEthernet0/0
ip address 20.20.20.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 18.18.18.1 255.255.255.0
duplex auto
speed auto
!
router rip
version 2
network 18.0.0.0
network 20.0.0.0
!
ip classless
ip route 30.30.30.0 255.255.255.0 FastEthernet0/0
ip route 25.25.25.0 255.255.255.0 FastEthernet0/0
ip route 25.25.25.0 255.255.255.0 20.20.20.2
!
!
!
!
!
!
!
line con 0
exec-timeout 0 0
line vty 0 4
login
!
!
!
end
中间的
Building configuration...

Current configuration : 980 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
ip dhcp excluded-address 19.19.19.1 19.19.19.20
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 20.20.20.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 19.19.19.19 255.255.255.0
ip helper-address 20.20.20.1
duplex auto
speed auto
!
interface Ethernet1/0
ip address 30.30.30.1 255.255.255.0
duplex auto
speed auto
!
interface Ethernet1/1
no ip address
duplex auto
speed auto
!
interface Ethernet1/2
no ip address
duplex auto
speed auto
!
interface Ethernet1/3
no ip address
duplex auto
speed auto
!
router rip
version 2
network 19.0.0.0
network 20.0.0.0
network 30.0.0.0
no auto-summary
!
ip classless
ip route 25.25.25.0 255.255.255.0 FastEthernet0/1
ip route 25.25.25.0 255.255.255.0 30.30.30.2
!
!
!
!
!
!
!
line con 0
line vty 0 4
login
!
!
!
end
第三个路由器
Building configuration...

Current configuration : 660 bytes
!
version 12.2
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface FastEthernet0/0
ip address 25.25.25.1 255.255.255.0
ip helper-address 20.20.20.1
ip helper-address 30.30.30.1
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 30.30.30.2 255.255.255.0
duplex auto
speed auto
!
router rip
version 2
network 25.0.0.0
network 30.0.0.0
no auto-summary
!
ip classless
ip route 20.20.20.0 255.255.255.0 30.30.30.1
ip route 18.18.18.0 255.255.255.0 30.30.30.1
!
!
!
!
!
!
!
line con 0
line vty 0 4
login
!
!
!
end
谢谢了

ywq1122

卩爿Μㄚ厢甚 发表于 2012-4-11 21:49
Building configuration...（第一个路由器）

Current configuration : 1059 bytes

你的配置，我看不下去，你可以参考，一下我的，因为时间问题，所以只是大概做了一下，测试后第三台可以获得地址。见下图
第一台
Current configuration : 583 bytes
!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
interface FastEthernet0/0
ip address 20.20.20.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
shutdown
!
interface Vlan1
no ip address
shutdown
!
router rip
version 2
network 20.0.0.0
!
ip classless
!
line con 0
line vty 0 4
login
!
end
第二台：
Current configuration : 551 bytes
!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!interface FastEthernet0/0
ip address 20.20.20.2 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 30.30.30.1 255.255.255.0
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
router rip
version 2
network 20.0.0.0
network 30.0.0.0
no auto-summary
!
ip classless
!
line con 0
line vty 0 4
login
end
第三台
Current configuration : 564 bytes
!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Router
!
!
interface FastEthernet0/0
ip address 25.25.25.1 255.255.255.0
ip helper-address 20.20.20.1
duplex auto
speed auto
!
interface FastEthernet0/1
ip address 30.30.30.2 255.255.255.0
duplex auto
speed auto
!
interface Vlan1
no ip address
shutdown
!
router rip
version 2
network 25.0.0.0
network 30.0.0.0
!
ip classless
!
line con 0
line vty 0 4
login
!
end

lvfeng

好好学习，天天向上，谢谢大家！

lvfeng

感谢楼主分享 收藏了

纯情小猴子

ojiangmengo

路过

yanjin1991

额。看不懂额···

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