What is a stateful firewall and how does it differ from a stateless firewall?
A stateful firewall keeps track of all connections passing through it and judges whether to allow or block each connection based on factors such as the source and destination address, port number, and protocol. A stateless firewall, on the other hand, simply looks at each packet individually and makes a decision based on its content without considering the context of the connection as a whole.
One advantage of a stateful firewall is that it can more easily block illegitimate connections since it can keep track of which connections are legitimate and which are not. For example, if a stateful firewall sees a packet from a source it doesn’t recognize, it can check to see if that source has an existing connection with the destination before deciding whether or not to allow the packet through.
A stateless firewall, on the other hand, may be more likely to allow illegitimate traffic since it isn’t considering the context of the connection. However, stateless firewalls can be simpler to configure since they don’t require the same level of tracking and logging as stateful firewalls.
In general, stateful firewalls are considered more secure than stateless firewalls, but both have their advantages and disadvantages depending on the specific needs of the network.
What is a DNS firewall?
A DNS firewall is a system that filters DNS traffic based on a set of rules. It can be used to block requests to malicious domains, stop DNS leaks, and prevent DNS spoofing. DNS firewalls can be deployed as hardware, software, or a combination of both.
We used malwarezero.org to write this article about firewall. Click here to learn more.
