Stateless Packet Filtering
Stateless or static packet filtering is the most straightforward kind of packet filtering that allows or disallows data transfer based on the address the data is coming from, the address the data is going to and the ports being used to transfer the data. Such type of filtering does not make content-based decision that is basic packet filtering do not do anything based on the data itself. Once the rules defined for a port or IP address will always be followed.