Rule only applies to packets with matching attributes. Rules are evaluated every time they match the pass/block state of a packet The default action is to pass the packet. Matching rule decides what action is taken if no rule matches the packet, Which of these actions are taken filter parameters specify the packets toįor each packet processed by the packet filter, the filter rulesĪre evaluated in sequential order, from first to last. Pass in on $ext_if proto tcp from any to any port 25 PACKETĪttributes of their layer 3 and layer 4 headers. Is effective until the end of the entire block.Īdditional configuration files can be included with the Care should be taken when commenting out multi-line text: the comment Using a hash mark (‘#’), and extend to the end of the current The current line can be extended over multiple lines using aīackslash (‘\’). System Fingerprinting A method for detecting a host's operating system. Normalisation Including scrub, fragment handling, and blocking spoofed traffic. Statefulįiltering Stateful filtering tracks packets by state.
Anchors Anchors are containers for rules and tables. Tables Tables provide a method for dealing with large numbers of addresses. Queueing Queueing provides rule-based bandwidth control.
Options Global options tune the behaviour of the packet filtering engine.
NETCONTROL VERSION 5.5 MANUAL
This is an overview of the sections in this manual page: Packetįiltering Packet filtering, including network address translation (NAT). Rules or definitions specified in pf.conf.
The pf(4) packet filter modifies, drops, or passes packets according to
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