Filters

A ruleset is made up of one to four filters that regulate the response to a packet. The filter's actions are defined by its initial keyword. Each type of filter may be used one time per connection. The following table explains the keywords, the types of packets affected by the filters, and the filter's actions:

Keyword	Packet Type	Action
bringup	outgoing dialup	Defines packets that cause a connection to be established.
keepup	inbound and outbound dialup	Defines packets that cause the idle timer to be reset, preventing the connection from going down.
pass	all packets	Defines packets that are allowed to pass through the filter. Packets that do not pass cannot cause a connection to be established.
log	all packets	Defines the characteristics that will cause a message about a packet to be added to a log file.

Filters defined in a ruleset replace any previous default definition for that filter. Defined filters are not additive with a default filter. If one of the keyword filters does not appear in a ruleset, that filter is defined by its the most recently parsed default ruleset. If there is no previous default ruleset, the implicit default is 'all', except for the log filter, which defaults to '!all'.

Filters

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