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Voir : le site de squid
Un serveur DNS est installé sur la passerelle.
La passerelle est mise en place avec masquerade :
(eth0 est la carte ethernet vers le web)
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
Le serveur squid est installé :
apt-get install --no-install-recommends squid3
Le fichier est commenté quasiment entièrement.
cp /etc/squid/squid.conf /etc/squid/squid.conf-saved
Puis pour y voir plus clair, on toutes les lignes dé-commentées du fichier original, et on re-crée ce fichier afin qu'il ne contienne que ces lignes.
echo "`grep -v "^#" /etc/squid/squid.conf | sed -e '/^$/d'`" >/etc/squid/squid.conf
Ce qui donne :
less /etc/squid/squid.conf
acl all src all acl manager proto cache_object #par défaut acl localhost src 127.0.0.1/32 # par défaut acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 # par défaut acl localnet src 10.0.0.0/8 # RFC1918 possible internal network acl localnet src 172.16.0.0/12 # RFC1918 possible internal network acl localnet src 192.168.0.0/16 # RFC1918 possible internal network acl SSL_ports port 443 # https acl SSL_ports port 563 # snews acl SSL_ports port 873 # rsync acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl Safe_ports port 631 # cups acl Safe_ports port 873 # rsync acl Safe_ports port 901 # SWAT acl purge method PURGE acl CONNECT method CONNECT http_access deny all http_access allow manager localhost http_access deny manager http_access allow purge localhost http_access deny purge http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localnet http_access allow localhost http_access deny all icp_access allow localnet icp_access deny all http_port 3128 hierarchy_stoplist cgi-bin ? cache_mem 8 MB access_log /var/log/squid/access.log squid refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880 refresh_pattern . 0 20% 4320 acl shoutcast rep_header X-HTTP09-First-Line ^ICY.[0-9] upgrade_http0.9 deny shoutcast acl apache rep_header Server ^Apache broken_vary_encoding allow apache extension_methods REPORT MERGE MKACTIVITY CHECKOUT visible_hostname debian-serveur hosts_file /etc/hosts coredump_dir /var/spool/squid
eth0 (vers internet) : 192.168.0.1
eth1 (vers lan) : 192.168.1.1
httpd_accel_host virtual httpd_accel_port 80 httpd_accel_with_proxy on httpd_accel_uses_host_header on acl lan src 192.168.0.1 192.168.1.0/24 http_access allow localhost http_access allow lan
acl all src all acl manager proto cache_object #par défaut acl localhost src 127.0.0.1/32 # par défaut acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 # par défaut acl localnet src 10.0.0.0/8 # RFC1918 possible internal network acl localnet src 172.16.0.0/12 # RFC1918 possible internal network acl localnet src 192.168.0.0/16 # RFC1918 possible internal network acl SSL_ports port 443 # https acl SSL_ports port 563 # snews acl SSL_ports port 873 # rsync 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 Safe_ports port 631 # cups acl Safe_ports port 873 # rsync acl Safe_ports port 901 # SWAT acl purge method PURGE acl CONNECT method CONNECT http_access deny all http_access allow manager localhost http_access deny manager http_access allow purge localhost http_access deny purge http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localnet httpd_accel_host virtual httpd_accel_port 80 httpd_accel_with_proxy on httpd_accel_uses_host_header on acl lan src 192.168.0.1 192.168.1.0/24 http_access allow localhost http_access allow lan http_access deny all icp_access allow localnet icp_access deny all http_port 3128 hierarchy_stoplist cgi-bin ? cache_mem 8 MB access_log /var/log/squid/access.log squid refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880 refresh_pattern . 0 20% 4320 acl shoutcast rep_header X-HTTP09-First-Line ^ICY.[0-9] upgrade_http0.9 deny shoutcast acl apache rep_header Server ^Apache broken_vary_encoding allow apache extension_methods REPORT MERGE MKACTIVITY CHECKOUT visible_hostname debian-serveur hosts_file /etc/hosts coredump_dir /var/spool/squid