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- [Instructor] Let's install Squid

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and block a website.

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Type sudo apt-get install squid.

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Press Enter.

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Type Y.

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And press Enter.

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To specify which site to block,

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we need to edit the configuration file.

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Type cd /etc/squid/.

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Press Enter.

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Type ls and squid.conf is the configuration file.

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Now type sudo nano

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squid.conf.

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Press Enter.

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Press Control and W together to do a search.

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Type url_regex.

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Press Enter.

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Let's add our rule here.

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Type acl space

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banned,

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B-A-N-N-E-D, space,

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url_regex.

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Here regex stands for regular expression used

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to specify search patterns.

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Our search pattern is a portion of a URL.

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We use the label banned

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to name this rule.

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We'll be using a file to store the banned URLs.

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Therefore, we need to specify where the file is.

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Type a double quotation mark.

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/etc/squid/

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and then the name of the file, blocked.

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And close the double quotation mark.

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Now find a line that says insert your own rules.

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And add http_access deny

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space banned.

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Let's save the file by pressing Control and X together.

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Type Y.

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Press Enter.

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Next, let's create our file

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that contains the list of blocked sites.

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Type sudo

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nano space

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the name of the file, blocked.

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Press Enter.

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Type .microsoft.com.

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Based on this regular expression,

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our proxy server Squid will block

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whatever domain name ending with .microsoft.com.

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Let's save the file.

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Press Control and X together.

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Type Y.

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Press Enter.

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Now let's restart Squid

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to use the updated configuration file.

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Type sudo systemctl

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restart

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squid.

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Press Enter.

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If you didn't have any typos in the configuration file,

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this will go without any errors.

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Yes, success.

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Now, open a web browser, click on the gear icon,

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type proxy in the search field.

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Click on Settings.

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Choose manual proxy configuration.

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Our proxy server is the localhost.

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The port number we're using here

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is the default port number for the proxy servers,

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which is 3128.

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Click on OK.

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Let's try to visit World Wide Web .microsoft.com

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and see what happens.

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As you can see, our access attempt

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is being blocked by the proxy server.