Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
from here download your proxy server http://www.squid-cache.org/Versions/v2/2.5/ , then read this http://squid.visolve.com/squid/sqguide.htm and step by step you will configure your proxy server. Then make the second lan card with private ip address and enable the ip_forwarding and with iptables make you SNAT iptables -t nat -A POSTROUTING -s your_private_Ip/255.255.25
regards,