请教2811如何配置才能adsl上网？

swear77

我的2811连接adsl modem，配置2811后无法上网。显示如下：
*Jun 4 03:15:03.571: %DIALER-6-BIND: Interface Vi1 bound to profile Di1
*Jun 4 03:15:03.575: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state to up
*Jun 4 03:15:03.979: %DIALER-6-UNBIND: Interface Vi1 unbound from profile Di1
*Jun 4 03:15:03.983: %LINK-3-UPDOWN: Interface Virtual-Access1, changed state to down

相关配置：
interface FastEthernet0/1
no ip address
ip accounting output-packets
ip mtu 1488
no ip route-cache cef
duplex auto
speed auto
pppoe enable
pppoe-client dial-pool-number 1
!
interface FastEthernet0/0/0
no ip address
!
interface FastEthernet0/0/1
no ip address
!
interface FastEthernet0/0/2
no ip address
!
interface FastEthernet0/0/3
no ip address
!
interface Vlan1
no ip address
!
interface Dialer1
mtu 1488
ip address negotiated
ip nat outside
encapsulation ppp
no ip mroute-cache
dialer pool 1
dialer idle-timeout 200
ppp authentication pap
ppp pap sent-username ad19200309 password 7 091B1A56415045
!

请各位指点，谢谢
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ssffzz1

debug 一下ppp 协议看看错误点。

以太口下的MTU不用改。