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 Blocking websites is when a certain party blocks a group of websites from Internet users so that they cannot access or visit them, and the blocking process may be done by governments to protect children from certain sites or for various reasons that may be political, and it can also be practical Blocking within the scope of a single home; So that parents either use specific software or configure devices so that their children do not see suitable websites; Like porn sites, or social networking sites, or anything else.

Methods used to block websites:

There are many methods that the responsible party may resort to to block websites from users, including the following:

 Packet Filter:

It is a method in which the firewall is used to monitor all the incoming and outgoing packets to and from the network, and based on what words may contain the packets, the communication (the process of exchanging packets) between the sender and the receiver is cut off.

 Deep package investigation:

Some security agencies use this method to eavesdrop on Internet users. By checking the data in the packet to reveal the specific words it contains; An email address, phone number, or IP address, etc.

Block IP address:

We consider this method one of the simplest means of blocking websites. So that the responsible party blocks the websites' IP address; However, this method will block any other sites that share the same IP address (as is the case with sites that use the shared hosting system for the server.

 DNS filtering and forwarding:

The process of blocking websites in this way is done by not processing the website address by the DNS server; As this server is responsible for translating the written form of the website into the form of an IP address, and usually Internet providers provide these servers to their customers.

 Moderator attack:

It is basically a method used in penetration, in which an intermediary device is inserted between the sender and the receiver so that all the packets pass through this intermediary, which in turn redirects the packet to the desired party, so that both the sender and the receiver think that the communication process is in the required manner, ignorant of the existence of a party eavesdropping on them In 2010, China used this method to filter and block websites. Disconnecting the TCP communications.

How to open blocked websites:

There are many methods that can be used to open blocked sites, and a certain method may be better than others depending on the method used in the blocking process. Among the ways to avoid blocking websites are the following:

 Use a Virtual Private Network:

Whereas, when using one of the virtual private networks to access the Internet, all the packets exchanged between the sender and the receiver when visiting a website pass through this virtual network only, and this method is perhaps the best to face blocking in cases of website address filtering and packet filtering) Deep packet investigation and middleman attack.

 Using the Tor network:

 The establishment of any connection to a specific site through the Tor network will be automatically encrypted, and it is best to use Tor in cases of blocking that is done by website address filtering, packet filtering, deep packet investigation and middleman attack.

 Use a proxy server:

The proxy server is similar in terms of its mechanism to the virtual private network, except that it is not as reliable, and this method is good for avoiding blocking that depends on blocking the website's IP address.

 Create a channel by secure transport protocol:

Where this method is considered an advanced and somewhat complicated, and it is similar in terms of its mechanism of work to the virtual private network, so all the packets are passed through a server that the user can access using the secure transport protocol, so that the process of browsing the Internet as it takes place through this server.