guglgym.blogg.se - Packet sender safe

#Packet sender safe update#

:broadcast - substitutes the network broadcast address.:network - substitutes the CIDR network block.The name of a network interface followed by any one of these modifiers:.This is useful on an interface that gets its IP address via DHCP orĭial-up as the ruleset doesn't have to be reloaded each time the

#Packet sender safe update#

This tells PF to update the rule if the IP address(es) on the named

The name of a network interface or group in parentheses ( ).

The name of a network interface followed by / netmaskĮach IP address on the interface is combined with the netmask to formĪ CIDR network block which is substituted into the rule.

The name of a network interface or group.Īny IP addresses assigned to the interface will be substituted into.

A fully qualified domain name that will be resolved via DNS when theĪll resulting IP addresses will be substituted into the rule.

Src_addr, dst_addr The source/destination address in the IP header. Protocol The Layer 4 protocol of the packet: PF is usually able to determine this parameter based on the source and/or

This would cause the rule to match for any packet traversing anyĪf The address family of the packet, either inet for IPv4 or Interface family group for cloned interfaces.The egress group, which contains the interface(s) that holds.Several groups are also automatically created by the kernel: Interfaces can be added to arbitrary groups using the Interface The name or group of the network interface the packet is moving through. Is considered the last matching rule and the specified Quick If a packet matches a rule specifying quick, then that rule To log all packets regardless, use log (all). If the rule creates state then only the packet which establishes the state Log Specifies that the packet should be logged via The default reaction may be overridden by specifying eitherĭirection The direction the packet is moving on an interface, either The pass action will pass the packet back to the kernel forįurther processing while the block action will react based on ] ]Īction The action to be taken for matching packets, either pass or The general, highly simplified syntax for filter rules is:Īction Ruleset, meaning that the resulting action will be pass if a There is an implicit pass all at the beginning of a filtering The last rule to match is the "winner" and will dictate what action to take on Packet will be evaluated against all filter rules before the final Unless the packet matches a rule containing the quick keyword, the The most often used criteria are source and destination address, source andįilter rules specify the criteria that a packet must match and the resultingĪction, either block or pass, that is taken when a match is found.įilter rules are evaluated in sequential order, first to last. Inspecting packets are based on the Layer 3 Packet filtering is the selective passing or blocking of data packets as they Passive Operating System Fingerprinting.