Modify or add following to squid configuration file (/etc/squid/squid.conf):
httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_with_proxy on
httpd_accel_uses_host_header on acl lan src 192.168.1.1 192.168.2.0/24
http_access allow localhost
http_access allow lan
[eth0 connected to internet and eth1 connected to local lan]
iptables -t nat -A PREROUTING -i eth1 -p tcp –-dport 80 -j DNAT –to 192.168.1.1:3128
iptables -t nat -A PREROUTING -i eth0 -p tcp –-dport 80 -j REDIRECT –-to-port 3128
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source:http://linuxpoison.blogspot.com/2007/12/1357817580903.html