可以参考如下配置。。


! version 12.1
service timestamps debug datetime msec
service timestamps datetime msec
!
hostname R1
!
ip subnet-zero
!
ip dhcp excluded-address 10.0.0.1
!
ip dhcp pool pool name

network 10.0.0.0 255.0.0.0
default-router 10.0.0.1
!
interface FastEthernet0
ip address 10.0.0.1 255.0.0.0
no ip directed-broadcast
ip nat inside
no ip mroute-cache
（如下为ADSL配置，固定IP不用配置）!
interface ATM0
no ip address
no ip directed-broadcast
no ip mroute-cache
no atm ilmi-keepalive
pvc 1/150
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
hold-queue 224 in
!
interface Dialer0
ip address negotiated
no ip directed-broadcast
ip nat outside
encapsulation ppp
dialer pool 1
dialer-group 1
ppp pap sent-username username password password

（NAT可以配置ISP给你的公网IP）。。
ip nat inside source list 1 interface Dialer0 overload
ip classless （ 静态路由下一跳IP可以问一下你的ISP）
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
access-list 1 permit 10.0.0.0 0.255.255.255
dialer-list 1 protocol ip permit
!
end