ho configurato il router ma c'è un problemino

il router pinga verso internet e verso la lan, i pc della lan pingano il router ma non riescono a pingare internet.
L'ADSL è tiscali business con ip statico
Cosa può essere??
Building configuration...
Current configuration : 1398 bytes
!
! No configuration change since last restart
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname router
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip subnet-zero
no ip source-route
!
!
ip name-server 213.205.32.70
ip name-server 213.205.36.70
!
!
ip cef
!
!
!
!
interface Loopback0
ip address 217.133.86.246 255.255.255.255
!
interface ATM0
no ip address
no ip route-cache
no ip mroute-cache
no atm auto-configuration
no atm ilmi-keepalive
no atm address-registration
no atm ilmi-enable
bundle-enable
dsl operating-mode auto
!
interface ATM0.1 point-to-point
no ip route-cache
no ip mroute-cache
pvc 8/35
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!
interface FastEthernet0
ip address 10.0.0.1 255.0.0.0
ip nat inside
speed auto
no cdp enable
!
interface Serial0
no ip address
shutdown
no cdp enable
!
interface Dialer0
ip address negotiated
ip nat outside
encapsulation ppp
dialer pool 1
ppp chap hostname user
ppp chap password 0 passwd
!
ip nat inside source list 1 interface Loopback0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
no ip http server
!
!
!
access-list 1 permit 0.0.0.0 255.0.0.0
dialer-list 1 protocol ip permit
no cdp run
!
!
control-plane
!
!
line con 0
speed 115200
line aux 0
line vty 0 4
login
!
!
end
Vi ringrazio