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The presented main proxy configuration (Figure 4.4) determines the normal operation of the Internet browsers. Therefore it is recommendable to define each Proxy type first:
Standard Proxy: It is not obligatory to use the proxy to access the Internet. The proxy is only used by those who configure the browser to use the proxy from the IPBrick port 3128. Users without any additional browser configurations continue to access the Internet without any problems. The web accesses are registered by IP's for statistical purposes.
Transparent Proxy: Every Internet access is done through the proxy. The firewall has to be activated. Users may configure their browsers to use the indicated proxy. They may also continue to access the Internet without any proxy configurations in their browsers. Here the firewall makes the traffic routing to the proxy. The web accesses are registered by IP's for statistical aims.
Proxy with Authentication: Internet access is only possible by using this proxy. In order to have access to the web, users have to configure their browser with this proxy. Once the browsers are configured, a valid authentication is asked whenever a user opens the browser. The user authentication is done by login and password. The firewall has to be activated. All web accesses are registered for each user purely for statistical purposes (NOTE: You have to select this option, if you want to create access permissions by using LDAP users and groups).