===Here my configuration for my ADSL from Nerim (a small french ISP which provide native IPv6)===

<code>
!
interface ATM0
 description DSL Nerim
 no ip address
 no ip redirects
 no ip proxy-arp
 load-interval 30
 no atm ilmi-keepalive
 pvc 0/16 ilmi
 !
 dsl operating-mode auto
!
interface ATM0.35 point-to-point
 description ATM FT
 no ip redirects
 no ip proxy-arp
 pvc cipa 8/35 
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !        
!         
interface Dialer0
 description PPPoA Nerim
 ip address negotiated
 ip nat outside
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ipv6 address autoconfig
 ipv6 enable
 ppp authentication chap callin
 ppp chap hostname <login>
 ppp chap password 7 <password>
 ppp multilink
!
</code>