Mine

http_port 3128
icp_port 0
cache_mem 100 MB

visible_hostname squid
cache_dir ufs /var/squid 256 16 256
log_fqdn on

httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on

############ Servers
acl low_ip src 192.168.10.241
acl low_ip src 192.168.10.242
acl low_ip src 192.168.10.243
acl low_ip src 192.168.10.247
acl low_ip src 192.168.10.248
acl low_ip src 192.168.10.249
acl low_ip src 192.168.10.250
acl low_ip src 192.168.10.251
acl low_ip src 192.168.10.252

########################################################
#               GOOD DOMAINS
acl gooddomain_nonGR url_regex "/etc/squid/web_sites_allow_nonGR"
http_access allow gooddomain_nonGR

#########################################################
#               BAD FILES
acl BAD_FILES_WIN urlpath_regex -i .(exe|bat|com|wsh|wsf|vxd|vbs|sys|shb|sct|scr|shs|reg|prf|pcd|mst|msp|msi|msc|isp|crt)$

#acl BAD_FILES_MEDIA urlpath_regex -i .(mp3|mov|avi|mpg|mpeg|asf|wmv|ra|rm|ram|asx|asf|afx|divx|m3u|viv|vivo|vo|qt)$
#http_access deny BAD_FILES_MEDIA

acl BAD_FILES_WIN urlpath_regex -i .(exe|bat|wsh|wsf|vxd|vbs|sys|shb|sct|scr|shs|reg|prf|pcd|mst|msi|msc|isp|crt)$
http_access deny BAD_FILES_WIN

acl BAD_FILES_ZIP urlpath_regex -i .(ace|cab|rar|rpm|gz)$
http_access deny BAD_FILES_ZIP

acl BAD_FILES_OFFICE urlpath_regex -i .(ade|xls|doc|ops|mdz|mdw|mdt|mde|mdb|mda)$
http_access deny BAD_FILES_OFFICE

acl BAD_FILES_MISC urlpath_regex -i .(crl)$
http_access deny BAD_FILES_MISC

########################################################
#               BAD DOMAINS
acl badDomain_nonGR url_regex "/etc/squid/web_sites_block_nonGR"
http_access deny badDomain_nonGR

acl badDomain_GR url_regex "/etc/squid/web_sites_block_GR"
deny_info ERR_BLOCK badDomain_GR
http_access deny badDomain_GR

acl akamaitech_url url_regex -i akamai
acl akamaitech_url url_regex -i a212
http_access deny akamaitech_url

acl baaaaaaad srcdomain akamaitechnologies.com
http_access deny baaaaaaad

#########################################################
##               ALLOWED IP


acl allow_ip src 192.168.10.90
acl allow_ip src 192.168.10.4
acl allow_ip src 192.168.10.5
acl allow_ip src 192.168.10.31

acl all src 0/0
http_access deny all