PPPoA配置实例（2600路由器连接Wic-1ADSL）

　　vpdn enable

　　no vpdn logging

　　!--- default.

　　!

　　vpdn-group pppoe

　　request-dialin

　　!--- we are the PPPoE client requesting to establish

　　!--- a session with the aggregation unit (6400 NRP).

　　protocol pppoe

　　!

　　!--- internal Ethernet network.

　　!

　　interface FastEthernet0

　　ip address 10.92.1.182 255.255.255.0

　　ip natinside

　　!--- DSL interface.

　　!

　　interface ATM0

　　no ip address

　　no atm ilmi-keepalive

　　bundle-enable

　　dsl operating-mode auto

　　hold-queue 224 in

　　!--- All defaults.

　　!--- PPPoE runs on top of AAL5SNAP, but the

　　!--- encap aal5snap command is not used.

　　!

　　interface ATM0.1 point-to-point

　　pvc 1/1

　　pppoe-client dial-pool-number 1

　　!--- pvc 1/1 is an example value that must be changed

　　!--- to match the value used by the ISP.

　　!

　　!--- The PPPoE client code ties into a dialer interface upon

　　!--- which a virtual-access interface is cloned.

　　!

　　interface Dialer1

　　ip address negotiated

　　ip mtu 1492

　　!--- Ethernet MTU default = 1500 (1492 + PPPoE headers = 1500)

　　ip nat outside

　　encapsulation ppp

　　dialer pool 1

　　!--- Ties to atm interface.

　　ppp authentication chap callin

　　ppp chap hostname

　　ppp chap password

　　!

　　!--- The ISP will instruct you regarding

　　!--- the type of authentication to use.

　　!--- To change from PPP CHAP to PPP PAP,

　　!--- replace the following three lines:

　　!--- ppp authentication chap callin

　　!--- ppp chap hostname

　　!--- ppp chap password

　　!--- with the following two lines:

　　!--- ppp authentication pap callin

　　!--- ppp pap sent-username password

　　!--- For NAT we are going to overload on the Dialer1

　　!--- interface and add a default route out

　　!--- since dialer ip address can change.

　　ip nat inside source list 1 interface Dialer1 overload

　　ip classless

　　ip route 0.0.0.0 0.0.0.0 dialer1

　　no ip http server

　　!

　　access-list 1 permit 10.92.1.0 0.0.0.255