Squid Proxy Server

Name: Squid Proxy Server
Rating: 4.3 (123 reviews)

How to configure Squid Proxy Server, Filter Web Traffic, Authentication and Transparent Proxy

Created byVipin Gupta

Last updated 1/2026

English

What you'll learn

How to configure Squid Proxy Server and setup clients
How to use Access Control Lists (ACLs)
How to control access on basis of source IP addresses, destination domains, words, day and time, MAC addresses etc.
How to configure Squid Authentication
How to setup Transparent Proxy
How to setup squid proxy server lab

Course content

7 sections • 38 lectures • 4h 1m total length

Course Overview2:07
Squid Proxy Server Lab Setup Details3:36
if you are facing issues regarding "yum" not working, please refer to lecture 38 for troubleshooting.
Verify Squid Proxy Server Lab Setup Settings7:56

How to Configure Squid Proxy Server Introduction10:13
Start Proxy Server and test internet connectivity5:50
Configuring Proxy Settings on Linux Client Running in GUI Mode6:14
Configuring Proxy Settings on Linux Client Running in CLI Mode6:03
Configuring Proxy Settings on Windows Client3:19
Configure proxy settings on the Windows Edge browser by enabling the open proxy settings, entering the proxy address 172.24.0.1 and port 3128, and saving to access pages.

Squid ACL Introduction. What is the purpose of Default ACL7:42
Create ACL for allowing access to a particular network. Verify using clients.8:11
Deny Access from a particular system. Create/Verify the ACL.5:54
Deny Access from particular IP range. Create/Verify the ACL.4:27
Deny Access from a particular network. Create/Verify the ACL.4:16
Create an ACL named lab1 to deny the 172.24.0.0/16 network. Apply http_access deny lab1 and then allow all, and verify access on C11, C21, and C30.
How to block websites. Create/Verify ACL.6:33
Block access on basis of particular words. Create and Verify ACL.6:19
Block access on basis of particular words. Use file for words.2:38

Control Access based on Type of file the user is trying to access.7:46
Allow/Deny Access based on time and day7:40
Block Access to certain types of files from a particular system. Combine ACLs.6:09
Demonstrate combining acl rules in squid to block specific file types for a single system using an aaa acl and badfiles, via http_access deny with an and condition.
Allow access to certain types of files during particular duration. Combine ACLs.6:44
Control access on basis of MAC Address5:53

CentOS Linux Installation14:56
Post Installation Settings8:38
Create Squid Proxy Server VM10:40
Create Linux Client VM with GUI7:40
Create Linux Client VM with CLI Mode2:59
install Windows 108:23
Test Connectivity from Windows System3:43
Yum Update Troubleshooting5:12
Backup Current Repository Configuration:
First, make a backup of your current repository configuration files.

cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

Edit the Repository Configuration:
Open the CentOS-Base.repo file in a text editor. (vi or nano)

nano /etc/yum.repos.d/CentOS-Base.repo

Update the Base Repository URLs:

Replace the existing base repository URLs with the URLs pointing to the CentOS Vault. The updated configuration should look something like this:

[base]
name=CentOS-$releasever - Base
baseurl=http://vault.centos.org/7.9.2009/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-$releasever - Updates
baseurl=http://vault.centos.org/7.9.2009/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-$releasever - Extras
baseurl=http://vault.centos.org/7.9.2009/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

Save the Changes:

Save the changes and exit the text editor (Ctrl+X, Y, Enter for nano).

Clean YUM Cache:

Clean the YUM cache to ensure it uses the updated repository configuration.

yum clean all
yum makecache

Update the System:

Now you can update your system using the Vault repositories.

yum update

This should allow you to continue using yum with the archived CentOS 7 repositories.
Course Quiz

Requirements

Basic Linux Knowledge

Description

Squid proxy server is used for internet sharing. It is one of the most widely used, very robust and powerful server. It also provides access control (ACLs) and caching. It improves response time and reduces bandwidth usage.

* Squid Proxy Server Introduction

* How to configure Squid Proxy Server and setup clients

* How to use Access Control Lists (ACLs). Different types of acls

* How to control access on basis of source IP addresses, destination domains, words, day and time, MAC addresses etc.

* How to combine various types of ACLs to fine tune access.

* How to configure Squid Authentication. How to verify whether authentication is working properly or not.

* How to setup Transparent Proxy. Setting up transparent proxy involves combining squid and iptables. What are the different settings that needs to be configured. How to access transparent proxy. What are the settings that needs to be made on client systems.

* How to setup Squid Proxy Server Lab. Squid proxy server lab consists of 4 systems. One Linux system with 2 network interface cards will act as proxy server. One NIC will will be used to connect to internet and other will be used to connect to local area network. Remaining 3 systems (2 Linux and 1 Windows) will act as squid proxy clients.

* How to configure proxy server settings in different GUI based browsers.

* How to configure CLI proxy settings.

Who this course is for:

Anyone who wants to learn squid proxy server

Squid Proxy Server

What you'll learn

Explore related topics

Course content