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Chapter 30
Filter Configuration
This chapter shows you how to create and apply filters.
30.1 About Filtering
Your Contivity 251 uses filters to decide whether or not to allow passage of a
data packet and/or to make a call. There are two types of filter applications: data
filtering and call filtering. Filters are subdivided into device and protocol filters,
which are discussed later.
Data filtering screens data to determine if the packet should be allowed to pass.
Data filters are divided into incoming and outgoing filters, depending on the
direction of the packet relative to a port. Data filtering can be applied on either
the WAN side or the Ethernet side. Call filtering is used to determine if a packet
should be allowed to trigger a call.
Outgoing packets must undergo data filtering before they encounter call filtering.
Call filters are divided into two groups, the built-in call filters and user-defined
call filters. Your Contivity 251 has built-in call filters that prevent administrative,
for example, RIP packets from triggering calls. These filters are always enabled
and not accessible to you. Your Contivity 251 applies the built-in filters first and
then the user-defined call filters, if applicable, as shown next.
Contivity 251 VPN Switch User's Guide
30-1
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