3com 3C840 Guía Del Usuario
12-2
C
HAPTER
12: C
ONFIGURING
F
ILTERS
Filtering
Capabilities
Capabilities
The OfficeConnect Remote 840 provides an extensive set of data filtering
capabilities. The OfficeConnect Remote 840 supports the following
filtering capabilities:
capabilities. The OfficeConnect Remote 840 supports the following
filtering capabilities:
■
Input and output data filtering.
■
Source and destination address filtering.
■
Protocol filtering.
■
Source and destination port filtering. A packet filter can control what
services local or remote users can access.
services local or remote users can access.
■
Route filtering can filter source and destination addresses in packets
that exchange routing table information.
that exchange routing table information.
■
Established session filtering. A packet filter can permit users to
connect with a remote network without letting remote users have
access to the local network (or vice versa).
connect with a remote network without letting remote users have
access to the local network (or vice versa).
Filter Classes
The OfficeConnect Remote 840 supports three filter classes:
■
Input data — filter packets as they enter.
■
Output data — filter packets as they exit.
■
Embedded bypass — for periodic router protocol packets (IP RIP, IPX
RIP and IPX SAP)
RIP and IPX SAP)
Each filter class can be identified further by the following types:
Filter Types
Filters can be classified by the following types:
■
Data filters — based on protocol-specific packet information.
■
Advertisement filters — based on broadcast packet information (IP
RIP, IPX RIP, and IPX SAP).
RIP, IPX RIP, and IPX SAP).
■
Generic filters — based on packet structure.
Data Filters
Data filters control network access based on the protocol, source /
destination address, and port designation (e.g., TCP and UDP port
designations) of the packet. The following table describes the data filters
supported.
destination address, and port designation (e.g., TCP and UDP port
designations) of the packet. The following table describes the data filters
supported.
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