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A Linux Foundation Certified Engineer? is a skilled professional who has the expertise to install, manage, and troubleshoot network services in Linux systems, and is in charge of the design, implementation and ongoing maintenance of the system-wide architecture. In Part 1 of this series, we showed how to install squid, a proxy caching server for web clients.
In this article, we will show you how to configure the Squid proxy server in order to grant or restrict Internet access, and how to configure an http client, or web browser, to use that proxy server. Let us remember that, in simple terms, a web proxy server is an intermediary between one (or more) client computers and a certain network resource, the most common being access to the Internet. You may be wondering, why would I want to add yet another piece of software to my network infrastructure? The access list rules consist of an allow or deny action followed by a number of ACL elements, and are used to indicate what action or limitation has to be enforced for a given request. Now, open the newly created squid.conf file, and look for (or add) the following ACL elements and access lists.
The third word, src in this case, is an ACL element type that is used to represent a client IP address or range of addresses, respectively. The two lines below are access list rules and represent an explicit implementation of the ACL directives mentioned earlier.
Note That by default, Squid listens on port 3128, but you can override this behaviour by editing the access list rule that begins with http_port (by default it reads http_port 3128). You can now verify that your local network client is accessing the Internet through your proxy as follows. Now suppose you want to explicitly deny access to that particular client IP address, while yet maintaining access for the rest of the local network.
To restrict access to Squid by domain we will use the dstdomain keyword in a ACL directive, as follows. Where forbidden_domains is a plain text file that contains the domains that we desire to deny access to.
Squid support several authentication mechanisms (Basic, NTLM, Digest, SPNEGO, and Oauth) and helpers (SQL database, LDAP, NIS, NCSA, to name a few).

Run the following command to create the file and to add credentials for user gacanepa (omit the -c flag if the file already exists). One of Squid’s distinguishing features is the possibility of caching resources requested from the web to disk in order to speed up future requests of those objects either by the same client or others. The maximum_object_size directive specifies the maximum size of allowed objects in the cache. The first and second 2880 are lower and upper limits, respectively, on how long objects without an explicit expiry time will be considered recent, and thus will be served by the cache, whereas 0% is the percentage of the objects’ age (time since last modification) that each object without explicit expiry time will be considered recent. The HIT and MISS keywords, along with the 200 http response code, indicate that the file was served successfully both times, but the cache was HIT and Missed respectively. You may want to refer to the Squid web site for further documentation (make sure to also check the wiki), but do not hesitate to contact us if you have any questions or comments.
I have configured squid proxy server but there is one problem, when I set proxy setting in google chrome browser then skype application is not working and when I remove the proxy setting it is working.
I believe your question refers to web browser configuration (which is performed on the client) rather than proxy server configuration, which is the topic of this article. Please refer to that post (link given below) before proceeding if you haven’t installed squid on your system yet.
In other words, the proxy server is connected on one side directly to the Internet (or to a router that is connected to the Internet) and on the other side to a network of client computers that will access the World Wide Web through it. Bypassing web filters is made possible through the use of a web proxy to which requests are made and which returns requested content to a client, instead of having the client request it directly to the Internet.
They are checked in order, and list searching terminates as soon as one of the rules is a match.
For that reason, we will create a new squid.conf file with only the lines that include configuration directives for our convenience, leaving out empty or commented lines.
You can specify a single host by IP (or hostname, if you have some sort of DNS resolution implemented) or by network address. In few words, they indicate that http access should be granted if the request comes from the local network (localnet), or from localhost.

Check Manual proxy configuration and enter the IP address of the proxy server and the port where it is listening for connections. Define a new ACL directive as follows (I’ve named it ubuntuOS but you can name it whatever you want). Add the ACL directive to the localnet access list that is already in place, but prefacing it with an exclamation sign. It will allow us to add a list of usernames (and their corresponding passwords) that will be allowed to use Squid. This directory must exist and be writeable by Squid (Squid will NOT create this directory for you).
When a request cannot be served by the cache for some reason, then Squid attempts to serve it from the Internet. You can use the proxy server to filter contents using a chosen criteria, and also to reduce latency (since identical incoming requests are served from the cache, which is closer to the client than the web server that is actually serving the content, resulting in faster data transfers) and network traffic as well (reducing the amount of used bandwidth, which saves you money if you’re paying for traffic). He works for a worldwide leading consumer product company and takes great pleasure in using FOSS tools to increase productivity in all areas of his daily work.
If a rule has multiple ACL elements, it is implemented as a boolean AND operation (all ACL elements of the rule must be a match in order for the rule to be a match). This means, “Allow Internet access to clients matching the localnet ACL directive except to the one that matches the ubuntuOS directive”.
When client2 requests access to the same file, squid can transfer the file from its cache instead of downloading it again from the Internet. As you can guess, you can use this feature to speed up data transfers in a network of computers that require frequent updates of some kind.

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