拓扑很简单：Router ——Switch——client PC
配置主要分为以下几个方面：
1.配置内部接口G0/1
interface GigabitEthernet0/1
ip address 192.168.0.1 255.255.255.0 //设置接口内部IP地址
ip nat inside //确认inside 接口
no shutdown //开启端口
2.配置DHCP服务
ip dhcp excluded-address 192.168.0.1 //设置保留不分配内部地址
ip dhcp pool client //配置DHCP地址池client
network 192.168.0.0 255.255.255.0
default-router 192.168.0.1 //配置客户端PC获取路由
dns-server 192.168.0.1 //配置内部网络DNS
3.配置DNS服务
ip dns server //启用Router路由功能
ip domain-lookup //禁止域名解析
ip name-server 221.228.255.1 218.2.135.1 //指定首选和备用DNS（各地有差异，请选择速度较快的）
4.配置外部接口G0/0
interface GigabitEthernet0/0
pppoe enable group global //开启外部接口pppoe功能，允许接口运行ppoe
pppoe-client dial-pool-number 2 //将以太网接口的pppoe拨号客户端加入拨号地址池2，即需要完成物理接口和逻辑地址池dial-pool-number 2之间的绑定
5.配置逻辑接口
interface Dialer1 //进入逻辑接口
ip address negotiated //与Adsl服务商动态协商获取IP地址
ip mtu 1492 //定义帧数，因为PPP封装的原因，ip mtu要做相应调整
ip nat outside //确认outside接口
encapsulation ppp //封装ppp协议
ip tcp adjust-mss 1452 // 命令调整 TCP SYN 数据包的 MSS（最大数据段大小）
dialer pool 2 //该接口使用拨号地址池2进行拨号
ppp authentication chap callin //将认证模式设置为chap
ppp chap hostname XXX //设置chap用户名（一般为11位的账户名）
ppp chap password XXX //设置chap密码
ppp pap sent-username XXX password XXX //拨号使用pap或者chap需依据服务商配置
ppp ipcp dns request //动态获取dns
6.配置NAT服务
access-list 1 permit 192.168.0.0 0.0.0.255
ip nat inside source list 1 interface Dialer1 overload
7.配置Router
ip route 0.0.0.0 0.0.0.0 Dialer1
PS:
1.cisco对于pppoe的设置采用的是BBA-group，而不是VPDN-group
所以没有办法在vpdn enable下面启用protocol pppoe
2.对于cisco设备客户端而言也就不需要去设置vpdn enable,即不需要配置VPDN服务
3.排错命令：debug pppoe events
================================================================================================
Router#show run
Building configuration...
Current configuration : 2093 bytes
!
! Last configuration change at 07:12:16 UTC Wed Aug 8 2018
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Router
!
boot-start-marker
boot-end-marker
!
!
!
no aaa new-model
!
!
!
ip cef
!
!
!
ip dhcp excluded-address 192.168.0.1
!
ip dhcp pool client
network 192.168.0.0 255.255.255.0
default-router 192.168.0.1
dns-server 114.114.114.114
!
!
!
ip name-server 221.228.255.1
ip name-server 218.2.135.1
no ipv6 cef
!
multilink bundle-name authenticated
!
vpdn enable
!
!
!
!
!
voice-card 0
!
!
!
!
!
!
!
!
license udi pid CISCO2951/K9 sn FTX1746AHG7
hw-module pvdm 0/0
!
!
!
!
redundancy
!
!
!
!
!
!
!
!
!
!
!
!
!
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
no ip address
duplex full
speed auto
pppoe enable group global
pppoe-client dial-pool-number 2
!
interface GigabitEthernet0/1
ip address 192.168.0.1 255.255.255.0
ip nat inside
ip virtual-reassembly in
duplex auto
speed auto
!
interface GigabitEthernet0/2
ip address dhcp
duplex auto
speed auto
!
interface Dialer1
ip address negotiated
ip mtu 1492
ip nat outside
ip virtual-reassembly in //ip虚拟分片重组
encapsulation ppp
ip tcp adjust-mss 1452
dialer pool 2
ppp authentication chap callin
ppp chap hostname 11122233344
ppp chap password 0 1234
ppp pap sent-username 11122233344 password 0 123412
ppp ipcp dns request
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip dns server
ip nat inside source list 1 interface Dialer1 overload
ip route 0.0.0.0 0.0.0.0 Dialer1
!
access-list 1 permit 192.168.0.0 0.0.0.255
!
nls resp-timeout 1
cpd cr-id 1
!
!
control-plane
!
!
voice-port 0/0/0
!
voice-port 0/0/1
!
voice-port 0/0/2
!
voice-port 0/0/3
!
!
mgcp profile default
!
!
gatekeeper
shutdown
!
line con 0
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
login
transport input all
!
scheduler allocate 20000 1000
!
end