interface Dialer0
 ip address negotiated
 ip access-group 100 in
 ip access-group 101 out
]...]
!


access-list 100 permit icmp any any echo-reply
access-list 100 permit icmp any any echo
access-list 100 permit icmp any any ttl-exceeded
access-list 100 permit icmp any any unreachable
access-list 100 permit icmp any any packet-too-big

access-list 101 permit ip any any