Mi squid.conf lo tengo de esta manera:
#========================== Squid 3.x Conf ===========================#
#----------------------------------------------------------------------
# Opciones de SQUID 3.x
#----------------------------------------------------------------------
http_port 3128 intercept
http_port 3129
cache_mgr Firecold
visible_hostname proxy.os.com
append_domain .proxy.os.com
pinger_enable off
workers 4
dns_v4_first on
cpu_affinity_map process_numbers=1,2,3,4 cores=1,2,3,4
#----------------------------------------------------------------------
# Servidor DNS y Politica de Cambios
#----------------------------------------------------------------------
dns_nameservers 127.0.0.1 200.49.160.35 8.8.8.8
dns_retransmit_interval 5 seconds
dns_timeout 2 minutes
#----------------------------------------------------------------------
acl Safe_ports port 80 82 84 86 # http
acl Safe_ports port 21 # ftp
acl SSL_ports port 443
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 631 # cups
acl Safe_ports port 873 # rsync
acl Safe_ports port 901 # SWAT
acl Safe_ports port 1863 # MSN
#acl SSL_ports port 443 # https
acl SSL_ports port 563 # snews
acl SSL_ports port 873 # rsync
acl CONNECT method CONNECT
#----------------------------------------------------------------------
acl accesototal src "/etc/squid3/accesototal.txt"
acl mired src "/etc/squid3/mired.txt"
acl denegados url_regex -i "/etc/squid3/denegados.lst"
acl magic_words1 url_regex -i 192.168.1
acl magic_words2 url_regex -i .exe .mp3 .zip .rar .avi .mpeg .mpe .mpg .wav
.mov .3gp .mov .flv .mp2 .mp5 .aac .wma .ogg .mka .asf .iff .amv
#----------------------------------------------------------------------
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow manager localhost
http_access deny manager all
#----------------------------------------------------------------------
http_access allow localhost
http_access allow accesototal
http_access allow mired !denegados
http_access deny all
reply_body_max_size 200 MB mired
#----------------------------------------------------------------------
coredump_dir /home/squid3/squid
#----------------------------------------------------------------------
# Memoria reservada para cache
# Se recomienda que dedique aprox. 5MB de RAM por cada 1GB asignado a
cache_dir
#----------------------------------------------------------------------
cache_mem 8192 MB
maximum_object_size_in_memory 200 MB
minimum_object_size 0 KB
maximum_object_size 10 MB
#----------------------------------------------------------------------
# Sustituir archivos de cache cuando llegue a 96%
#----------------------------------------------------------------------
cache_swap_low 92
cache_swap_high 96
#----------------------------------------------------------------------
# Total de espacio en HD a ser usado por el cache, numero de carpetas,
# numero de subcarpetas en cache
# 100000 = 100 GB
#----------------------------------------------------------------------
cache_dir aufs /var/spool/squid3/squid0${process_number} 10000 16 256
min-size=3100 max-size=90000
cache_dir aufs /var/spool/squid3/squid0${process_number} 10000 16 256
min-size=3100 max-size=90000
cache_dir aufs /var/spool/squid3/squid0${process_number} 10000 16 256
min-size=3100 max-size=90000
cache_dir aufs /var/spool/squid3/squid0${process_number} 10000 16 256
min-size=3100 max-size=90000
#----------------------------------------------------------------------
# Estandar de actualización de cache
# 1 mes = 10080 mins, 1 dia = 1440 mins
#----------------------------------------------------------------------
refresh_pattern -i \.jpg$ 14400 80% 43200 refresh-ims
refresh_pattern -i \.gif$ 14400 80% 43200 refresh-ims
refresh_pattern -i \.png$ 14400 80% 43200 refresh-ims
refresh_pattern -i \.jpeg$ 14400 80% 43200 refresh-ims
refresh_pattern -i \.bmp$ 14400 80% 43200 refresh-ims
refresh_pattern -i \.tif$ 14400 80% 43200 refresh-ims
refresh_pattern -i \.tiff$ 14400 80% 43200 refresh-ims
refresh_pattern -i \.swf$ 14400 80% 43200 refresh-ims
refresh_pattern -i \.html$ 10 20% 4320 refresh-ims
refresh_pattern -i \.htm$ 10 20% 4320 refresh-ims
refresh_pattern -i \.shtml$ 10 20% 4320 refresh-ims
refresh_pattern -i \.shtm$ 10 20% 4320 refresh-ims
refresh_pattern -i \.nub$ 2880 80% 21600 refresh-ims
refresh_pattern -i \.exe$ 14400 80% 43200
refresh_pattern -i \.zip$ 14400 80% 43200
refresh_pattern -i \.mov$ 14400 80% 43200
refresh_pattern -i \.mpe?g?$ 14400 80% 43200
refresh_pattern -i \.avi$ 14400 80% 43200
refresh_pattern -i \.qtm?$ 14400 80% 43200
refresh_pattern -i \.viv$ 14400 80% 43200
refresh_pattern -i \.wav$ 14400 80% 43200
refresh_pattern -i \.aiff?$ 14400 80% 43200
refresh_pattern -i \.au$ 14400 80% 43200
refresh_pattern -i \.ram?$ 14400 80% 43200
refresh_pattern -i \.snd$ 14400 80% 43200
refresh_pattern -i \.mid$ 14400 80% 43200
refresh_pattern -i \.mp2$ 14400 80% 43200
refresh_pattern -i \.mp3$ 14400 80% 43200
refresh_pattern -i \.sit$ 14400 80% 43200
refresh_pattern -i \.zip$ 14400 80% 43200
refresh_pattern -i \.hqx$ 14400 80% 43200
refresh_pattern -i \.arj$ 14400 80% 43200
refresh_pattern -i \.lzh$ 14400 80% 43200
refresh_pattern -i \.lha$ 14400 80% 43200
refresh_pattern -i \.cab$ 14400 80% 43200
refresh_pattern -i \.rar$ 14400 80% 43200
refresh_pattern -i \.tar$ 14400 80% 43200
refresh_pattern -i \.gz$ 14400 80% 43200
refresh_pattern -i \.z$ 14400 80% 43200
refresh_pattern -i \.a[0-9][0-9]$ 14400 80% 43200
refresh_pattern -i \.r[0-9][0-9]$ 14400 80% 43200
refresh_pattern -i \.txt$ 14400 80% 43200
refresh_pattern -i \.pdf$ 14400 80% 43200
refresh_pattern -i \.doc$ 14400 80% 43200
refresh_pattern -i \.rtf$ 14400 80% 43200
refresh_pattern -i \.tex$ 14400 80% 43200
refresh_pattern -i \.latex$ 14400 80% 43200
refresh_pattern -i \.class$ 14400 80% 43200
refresh_pattern -i \.js$ 14400 80% 43200
refresh_pattern -i \.ico$ 14400 80% 43200
refresh_pattern -i \.css$ 10 20% 4320
#----------------------------------------------------------------------
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|\?) 0 0% 0
#refresh_pattern (Release|Package(.gz)*)$ 0 20% 2880
refresh_pattern . 0 20% 4320
#----------------------------------------------------------------------
# Log de acessos por el cache o para SARG
#----------------------------------------------------------------------
logfile_rotate 7
access_log stdio:/var/log/squid3/access.log
cache_log /var/log/squid3/cache.log
cache_store_log none
#----------------------------------------------------------------------
# Otras configuraciones
#----------------------------------------------------------------------
server_persistent_connections off
client_persistent_connections off
quick_abort_min 0 KB
quick_abort_max 0 KB
quick_abort_pct 95
fqdncache_size 65535
cache_effective_user proxy
cache_effective_group proxy
ipcache_size 65535
ipcache_low 98
ipcache_high 99
#
-----------------------------------------------------------------------------
# TIMEOUTS
#
-----------------------------------------------------------------------------
forward_timeout 240 seconds
connect_timeout 60 seconds
peer_connect_timeout 30 seconds
read_timeout 900 seconds
request_timeout 120 seconds
persistent_request_timeout 60 seconds
client_lifetime 60 minutes
half_closed_clients off
pconn_timeout 60 seconds
shutdown_lifetime 20 seconds
#----------------------------------------------------------------------
# Manteniendo objetos recientes y pequeños en memoria
#----------------------------------------------------------------------
memory_replacement_policy heap GDSF
cache_replacement_policy heap LFUDA
#----------------------------------------------------------------------
# Sitios que se les niega el cache
#----------------------------------------------------------------------
acl nocache dstdomain .4shared.com .youtube.com .windowsupdate.com .gl$
.yimg.com .cemaco.com 192.168.0.254 internet.tigo.com.gt
no_cache deny nocache
#----------------------------------------------------------------------
# Negar cache para archivos con extension .asx e .asf |streaming|
#----------------------------------------------------------------------
acl asx url_regex -i \.asx$
cache deny asx
acl asf url_regex -i \.asf$
cache deny asf
#
-----------------------------------------------------------------------------
# Qos
#
-----------------------------------------------------------------------------
qos_flows local-hit=0x30
qos_flows parent-hit=0x32
qos_flows disable-preserve-miss
#
-----------------------------------------------------------------------------
# SNMP
#
-----------------------------------------------------------------------------
snmp_port 3401
acl snmppublic snmp_community public
snmp_access allow snmppublic all
snmp_incoming_address 0.0.0.0
snmp_outgoing_address 255.255.255.255
#
-----------------------------------------------------------------------------
# DELAY POOL PARAMETERS
#
-----------------------------------------------------------------------------
delay_pools 3
delay_class 1 2
delay_parameters 1 -1/-1 -1/-1
delay_access 1 allow accesototal
#
-----------------------------------------------------------------------------
delay_class 2 2
#-1/-1 significa que no hay limites.
delay_parameters 2 -1/-1 -1/-1
delay_access 2 allow mired magic_words1
#
-----------------------------------------------------------------------------
delay_class 3 2
delay_parameters 3 55000/55000 55000/55000
delay_access 3 allow mired magic_words2
#----------------------------------------------------------------------
acl raptor_lst url_regex -i "/etc/raptor/raptor.lst"
cache deny raptor_lst
cache_peer 192.168.1.1 parent 8080 0 proxy-only no-digest
dead_peer_timeout 2 seconds
cache_peer_access 192.168.1.1 allow raptor_lst
cache_peer_access 192.168.1.1 deny all
#----------------------------------------------------------------------
--
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