(config) # vpdn enable
(config) # vpdn-group pppoe
(config-vpdn) #accept-dialin
(config-vpdn-acc-in) # protocol pppoe
(config) # inter f0/0
(config-if) # no ip address
(config-if) # pppoe enable
(config-if) # pppoe-client dial-pool-number 1
(config-if) # inter dialer 1
(config-if) # ip add negotiated
(config-if) # ip nat outside
(config-if) # encupsulation ppp
(config-if) # dialer pool 1
(config-if) # dialer-group 1
(config-if) # ppp authentication pap callin
(config-if) # ppp pap sent-username XXXXXX password 0 XXXXXX
(config-if) # exit
(config) # access-list 1 permit any
(config) # ip nat inside source list 1 interface dialer 1 overload
(config) # ip router 0.0.0.0 0.0.0.0 dialer 1
(config) # inter f0/1
(config) # ip nat inside
(config) #ip add X.X.X.X 255.255.255.0
(config) # no shut
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原文：http://samgu.blog.51cto.com/2132391/1437934