How Does a Network Block Sites on the Web?

Before answering the question “how does a network block sites on the web”, it may be helpful to some people to explain “why does a network block sites on the web” as there are multiple reasons.

  • A business network may block sites on the web to prevent employees engaging in non-work related online activities.
  • A school network may block sites on the web to comply with state and federal laws relating to harmful Internet content.
  • A WiFi network may block sites to prevent users from viewing inappropriate material in sight of other customers, guests or visitors.

However, the most important reason why any network may block sites on the web is to protect the network – and the users who connect to it – from malware, ransomware and phishing. This reason alone justifies the implementation of a mechanism to block sites on the web, as the cost of recovering from a successful malware, ransomware or phishing attack can be substantial.

So, How Does a Network Block Sites on the Web?

In order to block sites on the web, businesses, school and other organizations providing a WiFi network use a network website filter. This is typically a software-based or cloud-based “virtual appliance” through which all web traffic travels. As web traffic passes through the network website filter, its content is checked to ensure it is malware-free and complies with user policies.

The protection against malware, ransomware and phishing consists of multiple elements. These include blacklists of websites known to harbor malware, antivirus software, malicious URL detection software, and SUBRL filters that check the IP addresses of each website to ensure it is not a known sources of spam emails – the same IP address often being used to deploy ransomware and phishing attacks.

User policies are set by a network administrator. They control what content should be allowed through the network website filter and what should be blocked by the filter. In a business environment, for example, a system administrator may want their network to block sites relating to pornography and online shopping – subjects considered to have the biggest negative impact on workplace productivity.

Setting User Policies with a Network Website Filter

Because user policies will vary significantly according to the nature of the network, the mechanisms for setting user policies have to be versatile. Typically they consist of category filters, keyword filters, and various other tools that control web access by time, by bandwidth or by IP address. A network website filter can also apply different user policies to individual network users or groups of network users.

Category filters are the easiest mechanisms to apply. There are fifty-three categories of website content (abortion, adult entertainment, alternative beliefs, alcohol, etc.) into which more than six billion web pages are sorted. In order for a network to block sites on the web in a certain category, network administrators just click on the name of the category via a web-based management platform.

Keyword filters block access to web pages containing a specific word or phrase, and can be used to prevent users visiting certain types of online content without blocking access to a whole category of content. The other mechanisms for setting user policies with a network website filter are fairly self-explanatory, and each can be applied to one or more user policies with a few clicks of a mouse.

Try a Network Website Filter for Free

SpamTitan´s range of network website filters is the WebTitan range. The WebTitan range has been designed to help administrators of a network block sites quickly and easily without compromising the network´s online security. There is a choice of three WebTitan network website filters to choose from:

  • WebTitan Gateway is a software-based virtual appliance that is scalable up to tens of thousands of network users.
  • WebTitan Cloud is a universally-compatible cloud-based filter that can be integrated with Active Directory for easier management.
  • WebTitan Cloud for WiFi has been specifically design to protect wireless networks and businesses that promote a BYOD policy.

To find out more about the WebTitan range of network website filters, or to request a free trial of the filter most suitable for your requirements, do not hesitate to contact us. Our team of Sales Technicians will be happy to answer your questions and explain more about our free trail offer.

It takes less than five minutes to find out how does a network block sites on the web, and within twenty minutes you could be protecting your network – and the users that connect to it – from malware, ransomware and phishing attacks.