El proxy trasparente tiene una configuracion del squid. /etc/squid/squid.conf
Esa es la siguiente
acl localhost src 127.0.0.1/32 ::1
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1
acl SSL_ports port 443
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
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 CONNECT method CONNECT
acl mi_red src 192.168.0.0/24
acl permito url_regex -i ‘/etc/squid/permitidas’
acl bloqueo url_regex -i ‘/etc/squid/bloqueadas’
#http_access allow mi_red permito
#http_access allow mi_red !bloqueo
reply_body_max_size 100 mb
http_port 3128 transparent
cache_mem 1400 MB
maximum_object_size_in_memory 5120 KB
cache_dir ufs /var/spool/squid 3048 8 128
maximum_object_size 4096 KB
cache_swap_low 90
cache_swap_high 95
coredump_dir /var/spool/squid
refresh_pattern ^ftp: 1440 20% 10080
refresh_pattern ^gopher: 1440 0% 1440
refresh_pattern -i (/cgi-bin/|?) 0 0% 0
refresh_pattern . 0 20% 4320
cache_effective_user proxy
visible_hostname Sanatorio del Pilar Proxy Server
cache_effective_group proxy
Luego tiene una regla de redireccion para el puerto 3218 ir al 80.
/etc/init.d/redireccion.sh
con el siguiente contenido:
#! /bin/sh
### BEGIN INIT INFO
# Provides: noip2
# Required-Start: $local_fs $remote_fs $network $syslog $named
# Required-Stop: $local_fs $remote_fs $network $syslog $named
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Start/stop redireccion
### END INIT INFO
iptables -t nat -A PREROUTING -i eth0 -p tcp –dport 80 -j REDIRECT –to-port 3128
iptables -t nat -A PREROUTING -i eth0 -p tcp –dport 443 -j REDIRECT –to-port 3128