thanks a lot
.The post really help me.
I my opinion this case have two solution
#acl banned_sites url_regex "/etc/squid/squid-banned.acl"
#http_access deny banned_sites
acl block_host1 src 192.168.1.50
http_access deny block_host1
acl block_host2 src 192.168.1.51
http_access deny block_host2
Both are valid if i am correct but the 1st one is much flexible.
what is your technical opinion about it ? hope as you mentioned in the post "Look at the "banned sites" ACL"