Filtrage sur routeur client

• access-list 100 deny ip 221.4.0.0 0.0.31.255 any

• access-list 100 permit icmp any any

• access-list 100 permit tcp any any established

• access-list 100 permit tcp any any eq 22

• access-list 100 permit tcp any host 221.4.0.1 eq www

• access-list 100 permit tcp any host 221.4.0.2 eq smtp

• access-list 100 permit tcp any host 221.4.0.3 eq domain

• access-list 100 permit udp any host 221.4.0.3 eq domain

• access-list 100 permit udp any any eq ntp

• access-list 100 deny udp any any eq 2049

• access-list 100 permit udp any any gt 1023

• access-list 100 deny ip any any log

• access-list 101 permit ip 221.4.0.0 0.0.3.255 any

• access-list 101 deny ip any any log

• Interface serial0/0

• ip access-group 100 in

• ip access-group 101 out