Traditional firewalls use stateless packet filtering, which examines only the header of each packet. Decisions to block or allow the traffic are made based on simple matching rules like IP address ...

Hardware firewalls might require some setup and ... At their simplest, they use a packet filter to examine every data packet ...

See packet filter. (2) (IP Filter) An open source utility developed by Darren Reed and other contributors that provides network address translation (NAT) and firewall services. It runs under ...