Security 13-11option in the answer profile, PAP or CHAP in connection profiles, callback, and general awareness of howyour network may be vulnerable.An approach to using filtersThe ultimate goal of network security is to prevent unauthorized access to the network without compromisingauthorized access. Using filter sets is part of reaching that goal.Each filter set you design will be based on one of the following approaches: That which is not expressly prohibited is permitted. That which is not expressly permitted is prohibited.It is strongly recommended that you take the latter, and safer, approach to all of your filter set designs.Working with IP Filters and Filter SetsThis section covers IP filters and filter sets.To work with filters and filter sets, begin by accessing the filter set screens.Note: Make sure you understand how filters work before attempting to use them. Read the section “AboutFilters and Filter Sets,” beginning on page 13-4.The procedure for creating and maintaining filter sets is as follows:MainMenuSystemConfigurationFilterSets IP Filter SetsIP Filter SetsDisplay/Change IP Filter Set...Add IP Filter Set...Delete IP Filter Set...Return/Enter to configure and add a new Filter SetSet Up IP Filter Sets (Firewalls) from this and the following Menus.
