This video tutorial will show you what a Squid Proxy Server does in Ubuntu. There are 3 parts.

Part 2 video will help you share your Internet connection to your workstation, plus having the benefit of filtering content by redirecting port 80 to port 3128 of Squid.

Final step to configure and share Internet connection with Squid Proxy on a server with 2 NIC's. We explain a little about iptables so it can jump and masquerade the workstations. Also, 2 things I forgot to mention which I added an annotation at the end of the video

1. Pls. don't forget to edit your /etc/squid/squid.conf and put:

http_port 3128 transparent

3128 is the Squid's port number. Transparent means you don't have to manually specify the proxy server on each workstation so that if you have 20 clients you don't have to go to each one of them.

2. Pls. also make sure that your client's /etc/resolv.conf is pointing to your router or dns-nameserver that is add this line anywhere in that file.

nameserver 192.168.0.254

192.168.0.254 - is the router's IP address. Good luck!