Compatible Systems 5.4 - Manual (Page 212)

206 Chapter 12 - IPX Filtering
Rules that have been specified using CompatiView may be edited or exam-
ined through the command line interface, and vice-versa. When the rules are
downloaded into the device from CompatiView, they will be encrypted.
Rule sets that have been created with the IPX SAP Filter Editor Window
must be applied using the pull-down menus in the Main IPX Filtering
Dialog Box.
Basic IPX SAP Filter Rules and Syntax
At a minimum, every non-comment line in a filter set must include an action.
However, an action alone will not create a useful filter rule (except for setting
a default rule as noted above).
Every line in a SAP filter set must begin with the actions permit or deny, or
the comment indicator #.
• Lines which begin with permit specify that server information meeting
the conditions should be inserted into the device’s SAP table.
• Lines which begin with deny specify that server information meeting the
conditions should not be included in the device’s SAP table.
• Lines which begin with # specify that the text on the line is a comment
and should be ignored.
IPX SAP Filter Options
The basic action specified in the rule will almost always be accompanied with
an option. IPX SAP options use some or all of a set of operators to determine
whether the filter rule matches information in a SAP packet or not. These
operators are discussed below:
• eq, ==, or = These are allowable ways of writing an “equality” operator
which will match if the value in the server information is equal to the
value specified in the option expression.
• lt or < These are allowable ways of writing a “less than” operator which
will match server information if its value is less than the value specified
in the option expression.
• lteq, le, <=, or =< These are allowable ways of writing a “less than or
equal to” operator which will match server information if its value is less
than or equal to the value specified in the option expression.
• gt or > These are allowable ways of writing a “greater than” operator
which will match server information if its value is greater than the value
specified in the option expression.