funziona così:
acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl SSL_ports port 443 563
acl Safe_ports port 80
acl Safe_ports port 21
acl Safe_ports port 443 563
acl Safe_ports port 70
acl Safe_ports port 210
acl Safe_ports port 1025-65535
acl Safe_ports port 280
acl Safe_ports port 488
acl Safe_ports port 591
acl Safe_ports port 777
acl CONNECT method CONNECT
acl lan src 192.168.0.0/24
acl ip_block1 src 192.168.0.247
http_access deny ip_block1
http_access allow lan
http_access allow all


Scusate se volessi mettere un intervallo di ip, è giusto così???
acl ip_block1 src 192.168.0.247-192.168.0.252

è giusto????