A firewall is a type of system used to monitor connections between computer networks.
A firewall either allows or blocks a requested network connection, such as a website, mail, and others, based on a set of rules.
At this level, the bulk of TCP/UDP flooding is blocked. Hardware filters enable enormous packet processing speed.
At the fine filtering level, the most sophisticated attacks are blocked, including attacks by bots.
Thanks to the extensive database of IP addresses of popular D/DoS attack services, it is possible to eliminate the threat before it appears.
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A packet filter firewall controls network access by analyzing outgoing and incoming packets. It decides whether to grant access to a packet by checking it based on predefined criteria such as allowed IP addresses, packet type, port number, etc. It should be noted that this type of firewall will not be able to prevent all types of attacks.
Stateful packet inspection (SPI), also sometimes called dynamic packet filtering, is a powerful firewall architecture that examines traffic flows from end to end. They monitor connections in both directions and monitor the status of that connection. These firewalls use an intelligent way to protect against unwanted traffic by analyzing packet headers and checking their status along with providing proxy services. They operate at the network layer in the OSI model.