Book Image

Squid Proxy Server 3.1: Beginner's Guide

Book Image

Squid Proxy Server 3.1: Beginner's Guide

Overview of this book

Squid Proxy Server enables you to cache your web content and return it quickly on subsequent requests. System administrators often struggle with delays and too much bandwidth being used, but Squid solves these problems by handling requests locally. By deploying Squid in accelerator mode, requests are handled faster than on normal web servers making your site perform quicker than everyone else's! Squid Proxy Server 3.1 Beginner's Guide will help you to install and configure Squid so that it is optimized to enhance the performance of your network. The Squid Proxy Server reduces the amount of effort that you will have to put in, saving your time to get the most out of your network. Whether you only run one site, or are in charge of a whole network, Squid is an invaluable tool that improves performance immeasurably. Caching and performance optimization usually requires a lot of work on the developer's part, but Squid does all that for you. This book will show you how to get the most out of Squid by customizing it for your network. You will learn about the different configuration options available and the transparent and accelerated modes that enable you to focus on particular areas of your network. Applying proxy servers to large networks can be a lot of work as you have to decide where to place restrictions and who should have access, but the straightforward examples in this book will guide you through step by step so that you will have a proxy server that covers all areas of your network by the time you finish the book.
Table of Contents (20 chapters)
Squid Proxy Server 3.1 Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – avoiding caching of local content


First of all, we'll need to identify the requests in which content on your local area network is being requested. So, let's say in our network, some clients have hosted FTP and HTTP servers on their machines to share content on the intranet. The client machines have IP addresses in the subnets 192.0.2.0/24 and 198.51.100.0/24. So, we need to construct an ACL list that can identify all the requests directed to these machines. The following ACL list does exactly that:

acl client_servers dst 192.0.2.0/24 198.51.100.0/24

Also, we have mail.internal.example.com and docs.internal.example.com hosted in the local network. So, let's construct an ACL list to identify all the requests to these websites:

acl internal_websites dstdomain .internal.example.com

So, as we have identified the requests for local content, we just need to instruct Squid not to cache replies to any of these requests. Therefore, we will use the access list rule cache to deny caching...